[catapult] - Copy Telemetry's gsutilz over to third_party.

third_party/gsutil/third_party/httplib2/python3/httplib2/__init__.py

Index: third_party/gsutil/third_party/httplib2/python3/httplib2/__init__.py
diff --git a/third_party/gsutil/third_party/httplib2/python3/httplib2/__init__.py b/third_party/gsutil/third_party/httplib2/python3/httplib2/__init__.py
new file mode 100644
index 0000000000000000000000000000000000000000..bf6c2e9b4b9cf96327e42a70a3ba7ffdf73a62e3
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@@ -0,0 +1,1349 @@
+
+"""
+httplib2
+
+A caching http interface that supports ETags and gzip
+to conserve bandwidth.
+
+Requires Python 3.0 or later
+
+Changelog:
+2009-05-28, Pilgrim: ported to Python 3
+2007-08-18, Rick: Modified so it's able to use a socks proxy if needed.
+
+"""
+
+__author__ = "Joe Gregorio (joe@bitworking.org)"
+__copyright__ = "Copyright 2006, Joe Gregorio"
+__contributors__ = ["Thomas Broyer (t.broyer@ltgt.net)",
+    "James Antill",
+    "Xavier Verges Farrero",
+    "Jonathan Feinberg",
+    "Blair Zajac",
+    "Sam Ruby",
+    "Louis Nyffenegger",
+    "Mark Pilgrim"]
+__license__ = "MIT"
+__version__ = "0.7.7"
+
+import re
+import sys
+import email
+import email.utils
+import email.message
+import email.feedparser
+import io
+import gzip
+import zlib
+import http.client
+import urllib.parse
+import base64
+import os
+import copy
+import calendar
+import time
+import random
+import errno
+from hashlib import sha1 as _sha, md5 as _md5
+import hmac
+from gettext import gettext as _
+import socket
+import ssl
+_ssl_wrap_socket = ssl.wrap_socket
+
+try:
+    import socks
+except ImportError:
+    socks = None
+
+from .iri2uri import iri2uri
+
+def has_timeout(timeout):
+    if hasattr(socket, '_GLOBAL_DEFAULT_TIMEOUT'):
+        return (timeout is not None and timeout is not socket._GLOBAL_DEFAULT_TIMEOUT)
+    return (timeout is not None)
+
+__all__ = ['Http', 'Response', 'ProxyInfo', 'HttpLib2Error',
+           'RedirectMissingLocation', 'RedirectLimit',
+           'FailedToDecompressContent', 'UnimplementedDigestAuthOptionError',
+           'UnimplementedHmacDigestAuthOptionError',
+           'debuglevel', 'RETRIES']
+
+
+# The httplib debug level, set to a non-zero value to get debug output
+debuglevel = 0
+
+# A request will be tried 'RETRIES' times if it fails at the socket/connection level.
+RETRIES = 2
+
+# All exceptions raised here derive from HttpLib2Error
+class HttpLib2Error(Exception): pass
+
+# Some exceptions can be caught and optionally
+# be turned back into responses.
+class HttpLib2ErrorWithResponse(HttpLib2Error):
+    def __init__(self, desc, response, content):
+        self.response = response
+        self.content = content
+        HttpLib2Error.__init__(self, desc)
+
+class RedirectMissingLocation(HttpLib2ErrorWithResponse): pass
+class RedirectLimit(HttpLib2ErrorWithResponse): pass
+class FailedToDecompressContent(HttpLib2ErrorWithResponse): pass
+class UnimplementedDigestAuthOptionError(HttpLib2ErrorWithResponse): pass
+class UnimplementedHmacDigestAuthOptionError(HttpLib2ErrorWithResponse): pass
+
+class MalformedHeader(HttpLib2Error): pass
+class RelativeURIError(HttpLib2Error): pass
+class ServerNotFoundError(HttpLib2Error): pass
+class CertificateValidationUnsupportedInPython31(HttpLib2Error): pass
+
+# Open Items:
+# -----------
+# Proxy support
+
+# Are we removing the cached content too soon on PUT (only delete on 200 Maybe?)
+
+# Pluggable cache storage (supports storing the cache in
+#   flat files by default. We need a plug-in architecture
+#   that can support Berkeley DB and Squid)
+
+# == Known Issues ==
+# Does not handle a resource that uses conneg and Last-Modified but no ETag as a cache validator.
+# Does not handle Cache-Control: max-stale
+# Does not use Age: headers when calculating cache freshness.
+
+
+# The number of redirections to follow before giving up.
+# Note that only GET redirects are automatically followed.
+# Will also honor 301 requests by saving that info and never
+# requesting that URI again.
+DEFAULT_MAX_REDIRECTS = 5
+
+# Which headers are hop-by-hop headers by default
+HOP_BY_HOP = ['connection', 'keep-alive', 'proxy-authenticate', 'proxy-authorization', 'te', 'trailers', 'transfer-encoding', 'upgrade']
+
+# Default CA certificates file bundled with httplib2.
+CA_CERTS = os.path.join(
+        os.path.dirname(os.path.abspath(__file__ )), "cacerts.txt")
+
+def _get_end2end_headers(response):
+    hopbyhop = list(HOP_BY_HOP)
+    hopbyhop.extend([x.strip() for x in response.get('connection', '').split(',')])
+    return [header for header in list(response.keys()) if header not in hopbyhop]
+
+URI = re.compile(r"^(([^:/?#]+):)?(//([^/?#]*))?([^?#]*)(\?([^#]*))?(#(.*))?")
+
+def parse_uri(uri):
+    """Parses a URI using the regex given in Appendix B of RFC 3986.
+
+        (scheme, authority, path, query, fragment) = parse_uri(uri)
+    """
+    groups = URI.match(uri).groups()
+    return (groups[1], groups[3], groups[4], groups[6], groups[8])
+
+def urlnorm(uri):
+    (scheme, authority, path, query, fragment) = parse_uri(uri)
+    if not scheme or not authority:
+        raise RelativeURIError("Only absolute URIs are allowed. uri = %s" % uri)
+    authority = authority.lower()
+    scheme = scheme.lower()
+    if not path:
+        path = "/"
+    # Could do syntax based normalization of the URI before
+    # computing the digest. See Section 6.2.2 of Std 66.
+    request_uri = query and "?".join([path, query]) or path
+    scheme = scheme.lower()
+    defrag_uri = scheme + "://" + authority + request_uri
+    return scheme, authority, request_uri, defrag_uri
+
+
+# Cache filename construction (original borrowed from Venus http://intertwingly.net/code/venus/)
+re_url_scheme    = re.compile(br'^\w+://')
+re_url_scheme_s  = re.compile(r'^\w+://')
+re_slash         = re.compile(br'[?/:|]+')
+
+def safename(filename):
+    """Return a filename suitable for the cache.
+
+    Strips dangerous and common characters to create a filename we
+    can use to store the cache in.
+    """
+
+    try:
+        if re_url_scheme_s.match(filename):
+            if isinstance(filename,bytes):
+                filename = filename.decode('utf-8')
+                filename = filename.encode('idna')
+            else:
+                filename = filename.encode('idna')
+    except UnicodeError:
+        pass
+    if isinstance(filename,str):
+        filename=filename.encode('utf-8')
+    filemd5 = _md5(filename).hexdigest().encode('utf-8')
+    filename = re_url_scheme.sub(b"", filename)
+    filename = re_slash.sub(b",", filename)
+
+    # limit length of filename
+    if len(filename)>200:
+        filename=filename[:200]
+    return b",".join((filename, filemd5)).decode('utf-8')
+
+NORMALIZE_SPACE = re.compile(r'(?:\r\n)?[ \t]+')
+def _normalize_headers(headers):
+    return dict([ (key.lower(), NORMALIZE_SPACE.sub(value, ' ').strip())  for (key, value) in headers.items()])
+
+def _parse_cache_control(headers):
+    retval = {}
+    if 'cache-control' in headers:
+        parts =  headers['cache-control'].split(',')
+        parts_with_args = [tuple([x.strip().lower() for x in part.split("=", 1)]) for part in parts if -1 != part.find("=")]
+        parts_wo_args = [(name.strip().lower(), 1) for name in parts if -1 == name.find("=")]
+        retval = dict(parts_with_args + parts_wo_args)
+    return retval
+
+# Whether to use a strict mode to parse WWW-Authenticate headers
+# Might lead to bad results in case of ill-formed header value,
+# so disabled by default, falling back to relaxed parsing.
+# Set to true to turn on, usefull for testing servers.
+USE_WWW_AUTH_STRICT_PARSING = 0
+
+# In regex below:
+#    [^\0-\x1f\x7f-\xff()<>@,;:\\\"/[\]?={} \t]+             matches a "token" as defined by HTTP
+#    "(?:[^\0-\x08\x0A-\x1f\x7f-\xff\\\"]|\\[\0-\x7f])*?"    matches a "quoted-string" as defined by HTTP, when LWS have already been replaced by a single space
+# Actually, as an auth-param value can be either a token or a quoted-string, they are combined in a single pattern which matches both:
+#    \"?((?<=\")(?:[^\0-\x1f\x7f-\xff\\\"]|\\[\0-\x7f])*?(?=\")|(?<!\")[^\0-\x08\x0A-\x1f\x7f-\xff()<>@,;:\\\"/[\]?={} \t]+(?!\"))\"?
+WWW_AUTH_STRICT = re.compile(r"^(?:\s*(?:,\s*)?([^\0-\x1f\x7f-\xff()<>@,;:\\\"/[\]?={} \t]+)\s*=\s*\"?((?<=\")(?:[^\0-\x08\x0A-\x1f\x7f-\xff\\\"]|\\[\0-\x7f])*?(?=\")|(?<!\")[^\0-\x1f\x7f-\xff()<>@,;:\\\"/[\]?={} \t]+(?!\"))\"?)(.*)$")
+WWW_AUTH_RELAXED = re.compile(r"^(?:\s*(?:,\s*)?([^ \t\r\n=]+)\s*=\s*\"?((?<=\")(?:[^\\\"]|\\.)*?(?=\")|(?<!\")[^ \t\r\n,]+(?!\"))\"?)(.*)$")
+UNQUOTE_PAIRS = re.compile(r'\\(.)')
+def _parse_www_authenticate(headers, headername='www-authenticate'):
+    """Returns a dictionary of dictionaries, one dict
+    per auth_scheme."""
+    retval = {}
+    if headername in headers:
+        try:
+            authenticate = headers[headername].strip()
+            www_auth = USE_WWW_AUTH_STRICT_PARSING and WWW_AUTH_STRICT or WWW_AUTH_RELAXED
+            while authenticate:
+                # Break off the scheme at the beginning of the line
+                if headername == 'authentication-info':
+                    (auth_scheme, the_rest) = ('digest', authenticate)
+                else:
+                    (auth_scheme, the_rest) = authenticate.split(" ", 1)
+                # Now loop over all the key value pairs that come after the scheme,
+                # being careful not to roll into the next scheme
+                match = www_auth.search(the_rest)
+                auth_params = {}
+                while match:
+                    if match and len(match.groups()) == 3:
+                        (key, value, the_rest) = match.groups()
+                        auth_params[key.lower()] = UNQUOTE_PAIRS.sub(r'\1', value) # '\\'.join([x.replace('\\', '') for x in value.split('\\\\')])
+                    match = www_auth.search(the_rest)
+                retval[auth_scheme.lower()] = auth_params
+                authenticate = the_rest.strip()
+        except ValueError:
+            raise MalformedHeader("WWW-Authenticate")
+    return retval
+
+
+def _entry_disposition(response_headers, request_headers):
+    """Determine freshness from the Date, Expires and Cache-Control headers.
+
+    We don't handle the following:
+
+    1. Cache-Control: max-stale
+    2. Age: headers are not used in the calculations.
+
+    Not that this algorithm is simpler than you might think
+    because we are operating as a private (non-shared) cache.
+    This lets us ignore 's-maxage'. We can also ignore
+    'proxy-invalidate' since we aren't a proxy.
+    We will never return a stale document as
+    fresh as a design decision, and thus the non-implementation
+    of 'max-stale'. This also lets us safely ignore 'must-revalidate'
+    since we operate as if every server has sent 'must-revalidate'.
+    Since we are private we get to ignore both 'public' and
+    'private' parameters. We also ignore 'no-transform' since
+    we don't do any transformations.
+    The 'no-store' parameter is handled at a higher level.
+    So the only Cache-Control parameters we look at are:
+
+    no-cache
+    only-if-cached
+    max-age
+    min-fresh
+    """
+
+    retval = "STALE"
+    cc = _parse_cache_control(request_headers)
+    cc_response = _parse_cache_control(response_headers)
+
+    if 'pragma' in request_headers and request_headers['pragma'].lower().find('no-cache') != -1:
+        retval = "TRANSPARENT"
+        if 'cache-control' not in request_headers:
+            request_headers['cache-control'] = 'no-cache'
+    elif 'no-cache' in cc:
+        retval = "TRANSPARENT"
+    elif 'no-cache' in cc_response:
+        retval = "STALE"
+    elif 'only-if-cached' in cc:
+        retval = "FRESH"
+    elif 'date' in response_headers:
+        date = calendar.timegm(email.utils.parsedate_tz(response_headers['date']))
+        now = time.time()
+        current_age = max(0, now - date)
+        if 'max-age' in cc_response:
+            try:
+                freshness_lifetime = int(cc_response['max-age'])
+            except ValueError:
+                freshness_lifetime = 0
+        elif 'expires' in response_headers:
+            expires = email.utils.parsedate_tz(response_headers['expires'])
+            if None == expires:
+                freshness_lifetime = 0
+            else:
+                freshness_lifetime = max(0, calendar.timegm(expires) - date)
+        else:
+            freshness_lifetime = 0
+        if 'max-age' in cc:
+            try:
+                freshness_lifetime = int(cc['max-age'])
+            except ValueError:
+                freshness_lifetime = 0
+        if 'min-fresh' in cc:
+            try:
+                min_fresh = int(cc['min-fresh'])
+            except ValueError:
+                min_fresh = 0
+            current_age += min_fresh
+        if freshness_lifetime > current_age:
+            retval = "FRESH"
+    return retval
+
+def _decompressContent(response, new_content):
+    content = new_content
+    try:
+        encoding = response.get('content-encoding', None)
+        if encoding in ['gzip', 'deflate']:
+            if encoding == 'gzip':
+                content = gzip.GzipFile(fileobj=io.BytesIO(new_content)).read()
+            if encoding == 'deflate':
+                content = zlib.decompress(content)
+            response['content-length'] = str(len(content))
+            # Record the historical presence of the encoding in a way the won't interfere.
+            response['-content-encoding'] = response['content-encoding']
+            del response['content-encoding']
+    except IOError:
+        content = ""
+        raise FailedToDecompressContent(_("Content purported to be compressed with %s but failed to decompress.") % response.get('content-encoding'), response, content)
+    return content
+
+def _bind_write_headers(msg):
+  from email.header import Header
+  def _write_headers(self):
+      # Self refers to the Generator object
+      for h, v in msg.items():
+          print('%s:' % h, end=' ', file=self._fp)
+          if isinstance(v, Header):
+              print(v.encode(maxlinelen=self._maxheaderlen), file=self._fp)
+          else:
+              # Header's got lots of smarts, so use it.
+              header = Header(v, maxlinelen=self._maxheaderlen, charset='utf-8',
+                              header_name=h)
+              print(header.encode(), file=self._fp)
+      # A blank line always separates headers from body
+      print(file=self._fp)
+  return _write_headers
+
+def _updateCache(request_headers, response_headers, content, cache, cachekey):
+    if cachekey:
+        cc = _parse_cache_control(request_headers)
+        cc_response = _parse_cache_control(response_headers)
+        if 'no-store' in cc or 'no-store' in cc_response:
+            cache.delete(cachekey)
+        else:
+            info = email.message.Message()
+            for key, value in response_headers.items():
+                if key not in ['status','content-encoding','transfer-encoding']:
+                    info[key] = value
+
+            # Add annotations to the cache to indicate what headers
+            # are variant for this request.
+            vary = response_headers.get('vary', None)
+            if vary:
+                vary_headers = vary.lower().replace(' ', '').split(',')
+                for header in vary_headers:
+                    key = '-varied-%s' % header
+                    try:
+                        info[key] = request_headers[header]
+                    except KeyError:
+                        pass
+
+            status = response_headers.status
+            if status == 304:
+                status = 200
+
+            status_header = 'status: %d\r\n' % status
+
+            try:
+                header_str = info.as_string()
+            except UnicodeEncodeError:
+                setattr(info, '_write_headers', _bind_write_headers(info))
+                header_str = info.as_string()
+
+            header_str = re.sub("\r(?!\n)|(?<!\r)\n", "\r\n", header_str)
+            text = b"".join([status_header.encode('utf-8'), header_str.encode('utf-8'), content])
+
+            cache.set(cachekey, text)
+
+def _cnonce():
+    dig = _md5(("%s:%s" % (time.ctime(), ["0123456789"[random.randrange(0, 9)] for i in range(20)])).encode('utf-8')).hexdigest()
+    return dig[:16]
+
+def _wsse_username_token(cnonce, iso_now, password):
+    return base64.b64encode(_sha(("%s%s%s" % (cnonce, iso_now, password)).encode('utf-8')).digest()).strip()
+
+
+# For credentials we need two things, first
+# a pool of credential to try (not necesarily tied to BAsic, Digest, etc.)
+# Then we also need a list of URIs that have already demanded authentication
+# That list is tricky since sub-URIs can take the same auth, or the
+# auth scheme may change as you descend the tree.
+# So we also need each Auth instance to be able to tell us
+# how close to the 'top' it is.
+
+class Authentication(object):
+    def __init__(self, credentials, host, request_uri, headers, response, content, http):
+        (scheme, authority, path, query, fragment) = parse_uri(request_uri)
+        self.path = path
+        self.host = host
+        self.credentials = credentials
+        self.http = http
+
+    def depth(self, request_uri):
+        (scheme, authority, path, query, fragment) = parse_uri(request_uri)
+        return request_uri[len(self.path):].count("/")
+
+    def inscope(self, host, request_uri):
+        # XXX Should we normalize the request_uri?
+        (scheme, authority, path, query, fragment) = parse_uri(request_uri)
+        return (host == self.host) and path.startswith(self.path)
+
+    def request(self, method, request_uri, headers, content):
+        """Modify the request headers to add the appropriate
+        Authorization header. Over-rise this in sub-classes."""
+        pass
+
+    def response(self, response, content):
+        """Gives us a chance to update with new nonces
+        or such returned from the last authorized response.
+        Over-rise this in sub-classes if necessary.
+
+        Return TRUE is the request is to be retried, for
+        example Digest may return stale=true.
+        """
+        return False
+
+    def __eq__(self, auth):
+        return False
+
+    def __ne__(self, auth):
+        return True
+
+    def __lt__(self, auth):
+        return True
+
+    def __gt__(self, auth):
+        return False
+
+    def __le__(self, auth):
+        return True
+
+    def __ge__(self, auth):
+        return False
+
+    def __bool__(self):
+        return True
+
+
+class BasicAuthentication(Authentication):
+    def __init__(self, credentials, host, request_uri, headers, response, content, http):
+        Authentication.__init__(self, credentials, host, request_uri, headers, response, content, http)
+
+    def request(self, method, request_uri, headers, content):
+        """Modify the request headers to add the appropriate
+        Authorization header."""
+        headers['authorization'] = 'Basic ' + base64.b64encode(("%s:%s" % self.credentials).encode('utf-8')).strip().decode('utf-8')
+
+
+class DigestAuthentication(Authentication):
+    """Only do qop='auth' and MD5, since that
+    is all Apache currently implements"""
+    def __init__(self, credentials, host, request_uri, headers, response, content, http):
+        Authentication.__init__(self, credentials, host, request_uri, headers, response, content, http)
+        challenge = _parse_www_authenticate(response, 'www-authenticate')
+        self.challenge = challenge['digest']
+        qop = self.challenge.get('qop', 'auth')
+        self.challenge['qop'] = ('auth' in [x.strip() for x in qop.split()]) and 'auth' or None
+        if self.challenge['qop'] is None:
+            raise UnimplementedDigestAuthOptionError( _("Unsupported value for qop: %s." % qop))
+        self.challenge['algorithm'] = self.challenge.get('algorithm', 'MD5').upper()
+        if self.challenge['algorithm'] != 'MD5':
+            raise UnimplementedDigestAuthOptionError( _("Unsupported value for algorithm: %s." % self.challenge['algorithm']))
+        self.A1 = "".join([self.credentials[0], ":", self.challenge['realm'], ":", self.credentials[1]])
+        self.challenge['nc'] = 1
+
+    def request(self, method, request_uri, headers, content, cnonce = None):
+        """Modify the request headers"""
+        H = lambda x: _md5(x.encode('utf-8')).hexdigest()
+        KD = lambda s, d: H("%s:%s" % (s, d))
+        A2 = "".join([method, ":", request_uri])
+        self.challenge['cnonce'] = cnonce or _cnonce()
+        request_digest  = '"%s"' % KD(H(self.A1), "%s:%s:%s:%s:%s" % (
+                self.challenge['nonce'],
+                '%08x' % self.challenge['nc'],
+                self.challenge['cnonce'],
+                self.challenge['qop'], H(A2)))
+        headers['authorization'] = 'Digest username="%s", realm="%s", nonce="%s", uri="%s", algorithm=%s, response=%s, qop=%s, nc=%08x, cnonce="%s"' % (
+                self.credentials[0],
+                self.challenge['realm'],
+                self.challenge['nonce'],
+                request_uri,
+                self.challenge['algorithm'],
+                request_digest,
+                self.challenge['qop'],
+                self.challenge['nc'],
+                self.challenge['cnonce'])
+        if self.challenge.get('opaque'):
+            headers['authorization'] += ', opaque="%s"' % self.challenge['opaque']
+        self.challenge['nc'] += 1
+
+    def response(self, response, content):
+        if 'authentication-info' not in response:
+            challenge = _parse_www_authenticate(response, 'www-authenticate').get('digest', {})
+            if 'true' == challenge.get('stale'):
+                self.challenge['nonce'] = challenge['nonce']
+                self.challenge['nc'] = 1
+                return True
+        else:
+            updated_challenge = _parse_www_authenticate(response, 'authentication-info').get('digest', {})
+
+            if 'nextnonce' in updated_challenge:
+                self.challenge['nonce'] = updated_challenge['nextnonce']
+                self.challenge['nc'] = 1
+        return False
+
+
+class HmacDigestAuthentication(Authentication):
+    """Adapted from Robert Sayre's code and DigestAuthentication above."""
+    __author__ = "Thomas Broyer (t.broyer@ltgt.net)"
+
+    def __init__(self, credentials, host, request_uri, headers, response, content, http):
+        Authentication.__init__(self, credentials, host, request_uri, headers, response, content, http)
+        challenge = _parse_www_authenticate(response, 'www-authenticate')
+        self.challenge = challenge['hmacdigest']
+        # TODO: self.challenge['domain']
+        self.challenge['reason'] = self.challenge.get('reason', 'unauthorized')
+        if self.challenge['reason'] not in ['unauthorized', 'integrity']:
+            self.challenge['reason'] = 'unauthorized'
+        self.challenge['salt'] = self.challenge.get('salt', '')
+        if not self.challenge.get('snonce'):
+            raise UnimplementedHmacDigestAuthOptionError( _("The challenge doesn't contain a server nonce, or this one is empty."))
+        self.challenge['algorithm'] = self.challenge.get('algorithm', 'HMAC-SHA-1')
+        if self.challenge['algorithm'] not in ['HMAC-SHA-1', 'HMAC-MD5']:
+            raise UnimplementedHmacDigestAuthOptionError( _("Unsupported value for algorithm: %s." % self.challenge['algorithm']))
+        self.challenge['pw-algorithm'] = self.challenge.get('pw-algorithm', 'SHA-1')
+        if self.challenge['pw-algorithm'] not in ['SHA-1', 'MD5']:
+            raise UnimplementedHmacDigestAuthOptionError( _("Unsupported value for pw-algorithm: %s." % self.challenge['pw-algorithm']))
+        if self.challenge['algorithm'] == 'HMAC-MD5':
+            self.hashmod = _md5
+        else:
+            self.hashmod = _sha
+        if self.challenge['pw-algorithm'] == 'MD5':
+            self.pwhashmod = _md5
+        else:
+            self.pwhashmod = _sha
+        self.key = "".join([self.credentials[0], ":",
+                            self.pwhashmod.new("".join([self.credentials[1], self.challenge['salt']])).hexdigest().lower(),
+                            ":", self.challenge['realm']])
+        self.key = self.pwhashmod.new(self.key).hexdigest().lower()
+
+    def request(self, method, request_uri, headers, content):
+        """Modify the request headers"""
+        keys = _get_end2end_headers(headers)
+        keylist = "".join(["%s " % k for k in keys])
+        headers_val = "".join([headers[k] for k in keys])
+        created = time.strftime('%Y-%m-%dT%H:%M:%SZ',time.gmtime())
+        cnonce = _cnonce()
+        request_digest = "%s:%s:%s:%s:%s" % (method, request_uri, cnonce, self.challenge['snonce'], headers_val)
+        request_digest  = hmac.new(self.key, request_digest, self.hashmod).hexdigest().lower()
+        headers['authorization'] = 'HMACDigest username="%s", realm="%s", snonce="%s", cnonce="%s", uri="%s", created="%s", response="%s", headers="%s"' % (
+                self.credentials[0],
+                self.challenge['realm'],
+                self.challenge['snonce'],
+                cnonce,
+                request_uri,
+                created,
+                request_digest,
+                keylist)
+
+    def response(self, response, content):
+        challenge = _parse_www_authenticate(response, 'www-authenticate').get('hmacdigest', {})
+        if challenge.get('reason') in ['integrity', 'stale']:
+            return True
+        return False
+
+
+class WsseAuthentication(Authentication):
+    """This is thinly tested and should not be relied upon.
+    At this time there isn't any third party server to test against.
+    Blogger and TypePad implemented this algorithm at one point
+    but Blogger has since switched to Basic over HTTPS and
+    TypePad has implemented it wrong, by never issuing a 401
+    challenge but instead requiring your client to telepathically know that
+    their endpoint is expecting WSSE profile="UsernameToken"."""
+    def __init__(self, credentials, host, request_uri, headers, response, content, http):
+        Authentication.__init__(self, credentials, host, request_uri, headers, response, content, http)
+
+    def request(self, method, request_uri, headers, content):
+        """Modify the request headers to add the appropriate
+        Authorization header."""
+        headers['authorization'] = 'WSSE profile="UsernameToken"'
+        iso_now = time.strftime("%Y-%m-%dT%H:%M:%SZ", time.gmtime())
+        cnonce = _cnonce()
+        password_digest = _wsse_username_token(cnonce, iso_now, self.credentials[1])
+        headers['X-WSSE'] = 'UsernameToken Username="%s", PasswordDigest="%s", Nonce="%s", Created="%s"' % (
+                self.credentials[0],
+                password_digest,
+                cnonce,
+                iso_now)
+
+class GoogleLoginAuthentication(Authentication):
+    def __init__(self, credentials, host, request_uri, headers, response, content, http):
+        from urllib.parse import urlencode
+        Authentication.__init__(self, credentials, host, request_uri, headers, response, content, http)
+        challenge = _parse_www_authenticate(response, 'www-authenticate')
+        service = challenge['googlelogin'].get('service', 'xapi')
+        # Bloggger actually returns the service in the challenge
+        # For the rest we guess based on the URI
+        if service == 'xapi' and  request_uri.find("calendar") > 0:
+            service = "cl"
+        # No point in guessing Base or Spreadsheet
+        #elif request_uri.find("spreadsheets") > 0:
+        #    service = "wise"
+
+        auth = dict(Email=credentials[0], Passwd=credentials[1], service=service, source=headers['user-agent'])
+        resp, content = self.http.request("https://www.google.com/accounts/ClientLogin", method="POST", body=urlencode(auth), headers={'Content-Type': 'application/x-www-form-urlencoded'})
+        lines = content.split('\n')
+        d = dict([tuple(line.split("=", 1)) for line in lines if line])
+        if resp.status == 403:
+            self.Auth = ""
+        else:
+            self.Auth = d['Auth']
+
+    def request(self, method, request_uri, headers, content):
+        """Modify the request headers to add the appropriate
+        Authorization header."""
+        headers['authorization'] = 'GoogleLogin Auth=' + self.Auth
+
+
+AUTH_SCHEME_CLASSES = {
+    "basic": BasicAuthentication,
+    "wsse": WsseAuthentication,
+    "digest": DigestAuthentication,
+    "hmacdigest": HmacDigestAuthentication,
+    "googlelogin": GoogleLoginAuthentication
+}
+
+AUTH_SCHEME_ORDER = ["hmacdigest", "googlelogin", "digest", "wsse", "basic"]
+
+class FileCache(object):
+    """Uses a local directory as a store for cached files.
+    Not really safe to use if multiple threads or processes are going to
+    be running on the same cache.
+    """
+    def __init__(self, cache, safe=safename): # use safe=lambda x: md5.new(x).hexdigest() for the old behavior
+        self.cache = cache
+        self.safe = safe
+        if not os.path.exists(cache):
+            os.makedirs(self.cache)
+
+    def get(self, key):
+        retval = None
+        cacheFullPath = os.path.join(self.cache, self.safe(key))
+        try:
+            f = open(cacheFullPath, "rb")
+            retval = f.read()
+            f.close()
+        except IOError:
+            pass
+        return retval
+
+    def set(self, key, value):
+        cacheFullPath = os.path.join(self.cache, self.safe(key))
+        f = open(cacheFullPath, "wb")
+        f.write(value)
+        f.close()
+
+    def delete(self, key):
+        cacheFullPath = os.path.join(self.cache, self.safe(key))
+        if os.path.exists(cacheFullPath):
+            os.remove(cacheFullPath)
+
+class Credentials(object):
+    def __init__(self):
+        self.credentials = []
+
+    def add(self, name, password, domain=""):
+        self.credentials.append((domain.lower(), name, password))
+
+    def clear(self):
+        self.credentials = []
+
+    def iter(self, domain):
+        for (cdomain, name, password) in self.credentials:
+            if cdomain == "" or domain == cdomain:
+                yield (name, password)
+
+class KeyCerts(Credentials):
+    """Identical to Credentials except that
+    name/password are mapped to key/cert."""
+    pass
+
+
+class ProxyInfo(object):
+  """Collect information required to use a proxy."""
+  def __init__(self, proxy_type, proxy_host, proxy_port, proxy_rdns=None, proxy_user=None, proxy_pass=None):
+      """The parameter proxy_type must be set to one of socks.PROXY_TYPE_XXX
+      constants. For example:
+
+p = ProxyInfo(proxy_type=socks.PROXY_TYPE_HTTP, proxy_host='localhost', proxy_port=8000)
+      """
+      self.proxy_type, self.proxy_host, self.proxy_port, self.proxy_rdns, self.proxy_user, self.proxy_pass = proxy_type, proxy_host, proxy_port, proxy_rdns, proxy_user, proxy_pass
+
+  def astuple(self):
+    return (self.proxy_type, self.proxy_host, self.proxy_port, self.proxy_rdns,
+            self.proxy_user, self.proxy_pass)
+
+  def isgood(self):
+    return socks and (self.proxy_host != None) and (self.proxy_port != None)
+
+
+def proxy_info_from_environment(method='http'):
+    """
+    Read proxy info from the environment variables.
+    """
+    if method not in ('http', 'https'):
+        return
+
+    env_var = method + '_proxy'
+    url = os.environ.get(env_var, os.environ.get(env_var.upper()))
+    if not url:
+        return
+    return proxy_info_from_url(url, method)
+
+
+def proxy_info_from_url(url, method='http'):
+    """
+    Construct a ProxyInfo from a URL (such as http_proxy env var)
+    """
+    url = urllib.parse.urlparse(url)
+    username = None
+    password = None
+    port = None
+    if '@' in url[1]:
+        ident, host_port = url[1].split('@', 1)
+        if ':' in ident:
+            username, password = ident.split(':', 1)
+        else:
+            password = ident
+    else:
+        host_port = url[1]
+    if ':' in host_port:
+        host, port = host_port.split(':', 1)
+    else:
+        host = host_port
+
+    if port:
+        port = int(port)
+    else:
+        port = dict(https=443, http=80)[method]
+
+    proxy_type = 3 # socks.PROXY_TYPE_HTTP
+    return ProxyInfo(
+        proxy_type = proxy_type,
+        proxy_host = host,
+        proxy_port = port,
+        proxy_user = username or None,
+        proxy_pass = password or None,
+    )
+
+
+class HTTPConnectionWithTimeout(http.client.HTTPConnection):
+    """HTTPConnection subclass that supports timeouts
+
+    HTTPConnection subclass that supports timeouts
+
+    All timeouts are in seconds. If None is passed for timeout then
+    Python's default timeout for sockets will be used. See for example
+    the docs of socket.setdefaulttimeout():
+    http://docs.python.org/library/socket.html#socket.setdefaulttimeout
+    """
+
+    def __init__(self, host, port=None, timeout=None, proxy_info=None):
+        http.client.HTTPConnection.__init__(self, host, port=port,
+                                            timeout=timeout)
+        self.proxy_info = proxy_info
+
+
+class HTTPSConnectionWithTimeout(http.client.HTTPSConnection):
+    """
+    This class allows communication via SSL.
+
+    All timeouts are in seconds. If None is passed for timeout then
+    Python's default timeout for sockets will be used. See for example
+    the docs of socket.setdefaulttimeout():
+    http://docs.python.org/library/socket.html#socket.setdefaulttimeout
+    """
+
+    def __init__(self, host, port=None, key_file=None, cert_file=None,
+                 timeout=None, proxy_info=None,
+                 ca_certs=None, disable_ssl_certificate_validation=False):
+        self.proxy_info = proxy_info
+        context = None
+        if ca_certs is None:
+            ca_certs = CA_CERTS
+        if (cert_file or ca_certs) and not disable_ssl_certificate_validation:
+            if not hasattr(ssl, 'SSLContext'):
+                raise CertificateValidationUnsupportedInPython31()
+            context = ssl.SSLContext(ssl.PROTOCOL_TLSv1)
+            context.verify_mode = ssl.CERT_REQUIRED
+            if cert_file:
+                context.load_cert_chain(cert_file, key_file)
+            if ca_certs:
+                context.load_verify_locations(ca_certs)
+        http.client.HTTPSConnection.__init__(
+                self, host, port=port, key_file=key_file,
+                cert_file=cert_file, timeout=timeout, context=context,
+                check_hostname=True)
+
+
+SCHEME_TO_CONNECTION = {
+    'http': HTTPConnectionWithTimeout,
+    'https': HTTPSConnectionWithTimeout,
+}
+
+class Http(object):
+    """An HTTP client that handles:
+
+    - all methods
+    - caching
+    - ETags
+    - compression,
+    - HTTPS
+    - Basic
+    - Digest
+    - WSSE
+
+    and more.
+    """
+    def __init__(self, cache=None, timeout=None,
+                 proxy_info=proxy_info_from_environment,
+                 ca_certs=None, disable_ssl_certificate_validation=False):
+        """If 'cache' is a string then it is used as a directory name for
+        a disk cache. Otherwise it must be an object that supports the
+        same interface as FileCache.
+
+        All timeouts are in seconds. If None is passed for timeout
+        then Python's default timeout for sockets will be used. See
+        for example the docs of socket.setdefaulttimeout():
+        http://docs.python.org/library/socket.html#socket.setdefaulttimeout
+
+        `proxy_info` may be:
+          - a callable that takes the http scheme ('http' or 'https') and
+            returns a ProxyInfo instance per request. By default, uses
+            proxy_info_from_environment.
+          - a ProxyInfo instance (static proxy config).
+          - None (proxy disabled).
+
+        ca_certs is the path of a file containing root CA certificates for SSL
+        server certificate validation.  By default, a CA cert file bundled with
+        httplib2 is used.
+
+        If disable_ssl_certificate_validation is true, SSL cert validation will
+        not be performed.
+"""
+        self.proxy_info = proxy_info
+        self.ca_certs = ca_certs
+        self.disable_ssl_certificate_validation = \
+                disable_ssl_certificate_validation
+        # Map domain name to an httplib connection
+        self.connections = {}
+        # The location of the cache, for now a directory
+        # where cached responses are held.
+        if cache and isinstance(cache, str):
+            self.cache = FileCache(cache)
+        else:
+            self.cache = cache
+
+        # Name/password
+        self.credentials = Credentials()
+
+        # Key/cert
+        self.certificates = KeyCerts()
+
+        # authorization objects
+        self.authorizations = []
+
+        # If set to False then no redirects are followed, even safe ones.
+        self.follow_redirects = True
+
+        # Which HTTP methods do we apply optimistic concurrency to, i.e.
+        # which methods get an "if-match:" etag header added to them.
+        self.optimistic_concurrency_methods = ["PUT", "PATCH"]
+
+        # If 'follow_redirects' is True, and this is set to True then
+        # all redirecs are followed, including unsafe ones.
+        self.follow_all_redirects = False
+
+        self.ignore_etag = False
+
+        self.force_exception_to_status_code = False
+
+        self.timeout = timeout
+
+        # Keep Authorization: headers on a redirect.
+        self.forward_authorization_headers = False
+
+    def __getstate__(self):
+        state_dict = copy.copy(self.__dict__)
+        # In case request is augmented by some foreign object such as
+        # credentials which handle auth
+        if 'request' in state_dict:
+            del state_dict['request']
+        if 'connections' in state_dict:
+            del state_dict['connections']
+        return state_dict
+
+    def __setstate__(self, state):
+        self.__dict__.update(state)
+        self.connections = {}
+
+    def _auth_from_challenge(self, host, request_uri, headers, response, content):
+        """A generator that creates Authorization objects
+           that can be applied to requests.
+        """
+        challenges = _parse_www_authenticate(response, 'www-authenticate')
+        for cred in self.credentials.iter(host):
+            for scheme in AUTH_SCHEME_ORDER:
+                if scheme in challenges:
+                    yield AUTH_SCHEME_CLASSES[scheme](cred, host, request_uri, headers, response, content, self)
+
+    def add_credentials(self, name, password, domain=""):
+        """Add a name and password that will be used
+        any time a request requires authentication."""
+        self.credentials.add(name, password, domain)
+
+    def add_certificate(self, key, cert, domain):
+        """Add a key and cert that will be used
+        any time a request requires authentication."""
+        self.certificates.add(key, cert, domain)
+
+    def clear_credentials(self):
+        """Remove all the names and passwords
+        that are used for authentication"""
+        self.credentials.clear()
+        self.authorizations = []
+
+    def _conn_request(self, conn, request_uri, method, body, headers):
+        for i in range(RETRIES):
+            try:
+                if conn.sock is None:
+                    conn.connect()
+                conn.request(method, request_uri, body, headers)
+            except socket.timeout:
+                conn.close()
+                raise
+            except socket.gaierror:
+                conn.close()
+                raise ServerNotFoundError("Unable to find the server at %s" % conn.host)
+            except socket.error as e:
+                errno_ = (e.args[0].errno if isinstance(e.args[0], socket.error) else e.errno)
+                if errno_ == errno.ECONNREFUSED: # Connection refused
+                    raise
+            except http.client.HTTPException:
+                if conn.sock is None:
+                    if i < RETRIES-1:
+                        conn.close()
+                        conn.connect()
+                        continue
+                    else:
+                        conn.close()
+                        raise
+                if i < RETRIES-1:
+                    conn.close()
+                    conn.connect()
+                    continue
+                # Just because the server closed the connection doesn't apparently mean
+                # that the server didn't send a response.
+                pass
+            try:
+                response = conn.getresponse()
+            except socket.timeout:
+                raise
+            except (socket.error, http.client.HTTPException):
+                conn.close()
+                if i == 0:
+                    conn.close()
+                    conn.connect()
+                    continue
+                else:
+                    raise
+            else:
+                content = b""
+                if method == "HEAD":
+                    conn.close()
+                else:
+                    content = response.read()
+                response = Response(response)
+                if method != "HEAD":
+                    content = _decompressContent(response, content)
+
+            break
+        return (response, content)
+
+
+    def _request(self, conn, host, absolute_uri, request_uri, method, body, headers, redirections, cachekey):
+        """Do the actual request using the connection object
+        and also follow one level of redirects if necessary"""
+
+        auths = [(auth.depth(request_uri), auth) for auth in self.authorizations if auth.inscope(host, request_uri)]
+        auth = auths and sorted(auths)[0][1] or None
+        if auth:
+            auth.request(method, request_uri, headers, body)
+
+        (response, content) = self._conn_request(conn, request_uri, method, body, headers)
+
+        if auth:
+            if auth.response(response, body):
+                auth.request(method, request_uri, headers, body)
+                (response, content) = self._conn_request(conn, request_uri, method, body, headers )
+                response._stale_digest = 1
+
+        if response.status == 401:
+            for authorization in self._auth_from_challenge(host, request_uri, headers, response, content):
+                authorization.request(method, request_uri, headers, body)
+                (response, content) = self._conn_request(conn, request_uri, method, body, headers, )
+                if response.status != 401:
+                    self.authorizations.append(authorization)
+                    authorization.response(response, body)
+                    break
+
+        if (self.follow_all_redirects or (method in ["GET", "HEAD"]) or response.status == 303):
+            if self.follow_redirects and response.status in [300, 301, 302, 303, 307]:
+                # Pick out the location header and basically start from the beginning
+                # remembering first to strip the ETag header and decrement our 'depth'
+                if redirections:
+                    if 'location' not in response and response.status != 300:
+                        raise RedirectMissingLocation( _("Redirected but the response is missing a Location: header."), response, content)
+                    # Fix-up relative redirects (which violate an RFC 2616 MUST)
+                    if 'location' in response:
+                        location = response['location']
+                        (scheme, authority, path, query, fragment) = parse_uri(location)
+                        if authority == None:
+                            response['location'] = urllib.parse.urljoin(absolute_uri, location)
+                    if response.status == 301 and method in ["GET", "HEAD"]:
+                        response['-x-permanent-redirect-url'] = response['location']
+                        if 'content-location' not in response:
+                            response['content-location'] = absolute_uri
+                        _updateCache(headers, response, content, self.cache, cachekey)
+                    if 'if-none-match' in headers:
+                        del headers['if-none-match']
+                    if 'if-modified-since' in headers:
+                        del headers['if-modified-since']
+                    if 'authorization' in headers and not self.forward_authorization_headers:
+                        del headers['authorization']
+                    if 'location' in response:
+                        location = response['location']
+                        old_response = copy.deepcopy(response)
+                        if 'content-location' not in old_response:
+                            old_response['content-location'] = absolute_uri
+                        redirect_method = method
+                        if response.status in [302, 303]:
+                          redirect_method = "GET"
+                          body = None
+                        (response, content) = self.request(location, redirect_method, body=body, headers = headers, redirections = redirections - 1)
+                        response.previous = old_response
+                else:
+                    raise RedirectLimit("Redirected more times than redirection_limit allows.", response, content)
+            elif response.status in [200, 203] and method in ["GET", "HEAD"]:
+                # Don't cache 206's since we aren't going to handle byte range requests
+                if 'content-location' not in response:
+                    response['content-location'] = absolute_uri
+                _updateCache(headers, response, content, self.cache, cachekey)
+
+        return (response, content)
+
+    def _normalize_headers(self, headers):
+        return _normalize_headers(headers)
+
+# Need to catch and rebrand some exceptions
+# Then need to optionally turn all exceptions into status codes
+# including all socket.* and httplib.* exceptions.
+
+
+    def request(self, uri, method="GET", body=None, headers=None, redirections=DEFAULT_MAX_REDIRECTS, connection_type=None):
+        """ Performs a single HTTP request.
+The 'uri' is the URI of the HTTP resource and can begin
+with either 'http' or 'https'. The value of 'uri' must be an absolute URI.
+
+The 'method' is the HTTP method to perform, such as GET, POST, DELETE, etc.
+There is no restriction on the methods allowed.
+
+The 'body' is the entity body to be sent with the request. It is a string
+object.
+
+Any extra headers that are to be sent with the request should be provided in the
+'headers' dictionary.
+
+The maximum number of redirect to follow before raising an
+exception is 'redirections. The default is 5.
+
+The return value is a tuple of (response, content), the first
+being and instance of the 'Response' class, the second being
+a string that contains the response entity body.
+        """
+        try:
+            if headers is None:
+                headers = {}
+            else:
+                headers = self._normalize_headers(headers)
+
+            if 'user-agent' not in headers:
+                headers['user-agent'] = "Python-httplib2/%s (gzip)" % __version__
+
+            uri = iri2uri(uri)
+
+            (scheme, authority, request_uri, defrag_uri) = urlnorm(uri)
+            domain_port = authority.split(":")[0:2]
+            if len(domain_port) == 2 and domain_port[1] == '443' and scheme == 'http':
+                scheme = 'https'
+                authority = domain_port[0]
+
+            conn_key = scheme+":"+authority
+            if conn_key in self.connections:
+                conn = self.connections[conn_key]
+            else:
+                if not connection_type:
+                    connection_type = SCHEME_TO_CONNECTION[scheme]
+                certs = list(self.certificates.iter(authority))
+                if issubclass(connection_type, HTTPSConnectionWithTimeout):
+                    if certs:
+                        conn = self.connections[conn_key] = connection_type(
+                                authority, key_file=certs[0][0],
+                                cert_file=certs[0][1], timeout=self.timeout,
+                                proxy_info=self.proxy_info,
+                                ca_certs=self.ca_certs,
+                                disable_ssl_certificate_validation=
+                                        self.disable_ssl_certificate_validation)
+                    else:
+                        conn = self.connections[conn_key] = connection_type(
+                                authority, timeout=self.timeout,
+                                proxy_info=self.proxy_info,
+                                ca_certs=self.ca_certs,
+                                disable_ssl_certificate_validation=
+                                        self.disable_ssl_certificate_validation)
+                else:
+                    conn = self.connections[conn_key] = connection_type(
+                            authority, timeout=self.timeout,
+                            proxy_info=self.proxy_info)
+                conn.set_debuglevel(debuglevel)
+
+            if 'range' not in headers and 'accept-encoding' not in headers:
+                headers['accept-encoding'] = 'gzip, deflate'
+
+            info = email.message.Message()
+            cached_value = None
+            if self.cache:
+                cachekey = defrag_uri
+                cached_value = self.cache.get(cachekey)
+                if cached_value:
+                    try:
+                        info, content = cached_value.split(b'\r\n\r\n', 1)
+                        info = email.message_from_bytes(info)
+                        for k, v in info.items():
+                          if v.startswith('=?') and v.endswith('?='):
+                            info.replace_header(k,
+                                                str(*email.header.decode_header(v)[0]))
+                    except (IndexError, ValueError):
+                        self.cache.delete(cachekey)
+                        cachekey = None
+                        cached_value = None
+            else:
+                cachekey = None
+
+            if method in self.optimistic_concurrency_methods and self.cache and 'etag' in info and not self.ignore_etag and 'if-match' not in headers:
+                # http://www.w3.org/1999/04/Editing/
+                headers['if-match'] = info['etag']
+
+            if method not in ["GET", "HEAD"] and self.cache and cachekey:
+                # RFC 2616 Section 13.10
+                self.cache.delete(cachekey)
+
+            # Check the vary header in the cache to see if this request
+            # matches what varies in the cache.
+            if method in ['GET', 'HEAD'] and 'vary' in info:
+                vary = info['vary']
+                vary_headers = vary.lower().replace(' ', '').split(',')
+                for header in vary_headers:
+                    key = '-varied-%s' % header
+                    value = info[key]
+                    if headers.get(header, None) != value:
+                            cached_value = None
+                            break
+
+            if cached_value and method in ["GET", "HEAD"] and self.cache and 'range' not in headers:
+                if '-x-permanent-redirect-url' in info:
+                    # Should cached permanent redirects be counted in our redirection count? For now, yes.
+                    if redirections <= 0:
+                        raise RedirectLimit("Redirected more times than redirection_limit allows.", {}, "")
+                    (response, new_content) = self.request(info['-x-permanent-redirect-url'], "GET", headers = headers, redirections = redirections - 1)
+                    response.previous = Response(info)
+                    response.previous.fromcache = True
+                else:
+                    # Determine our course of action:
+                    #   Is the cached entry fresh or stale?
+                    #   Has the client requested a non-cached response?
+                    #
+                    # There seems to be three possible answers:
+                    # 1. [FRESH] Return the cache entry w/o doing a GET
+                    # 2. [STALE] Do the GET (but add in cache validators if available)
+                    # 3. [TRANSPARENT] Do a GET w/o any cache validators (Cache-Control: no-cache) on the request
+                    entry_disposition = _entry_disposition(info, headers)
+
+                    if entry_disposition == "FRESH":
+                        if not cached_value:
+                            info['status'] = '504'
+                            content = b""
+                        response = Response(info)
+                        if cached_value:
+                            response.fromcache = True
+                        return (response, content)
+
+                    if entry_disposition == "STALE":
+                        if 'etag' in info and not self.ignore_etag and not 'if-none-match' in headers:
+                            headers['if-none-match'] = info['etag']
+                        if 'last-modified' in info and not 'last-modified' in headers:
+                            headers['if-modified-since'] = info['last-modified']
+                    elif entry_disposition == "TRANSPARENT":
+                        pass
+
+                    (response, new_content) = self._request(conn, authority, uri, request_uri, method, body, headers, redirections, cachekey)
+
+                if response.status == 304 and method == "GET":
+                    # Rewrite the cache entry with the new end-to-end headers
+                    # Take all headers that are in response
+                    # and overwrite their values in info.
+                    # unless they are hop-by-hop, or are listed in the connection header.
+
+                    for key in _get_end2end_headers(response):
+                        info[key] = response[key]
+                    merged_response = Response(info)
+                    if hasattr(response, "_stale_digest"):
+                        merged_response._stale_digest = response._stale_digest
+                    _updateCache(headers, merged_response, content, self.cache, cachekey)
+                    response = merged_response
+                    response.status = 200
+                    response.fromcache = True
+
+                elif response.status == 200:
+                    content = new_content
+                else:
+                    self.cache.delete(cachekey)
+                    content = new_content
+            else:
+                cc = _parse_cache_control(headers)
+                if 'only-if-cached'in cc:
+                    info['status'] = '504'
+                    response = Response(info)
+                    content = b""
+                else:
+                    (response, content) = self._request(conn, authority, uri, request_uri, method, body, headers, redirections, cachekey)
+        except Exception as e:
+            if self.force_exception_to_status_code:
+                if isinstance(e, HttpLib2ErrorWithResponse):
+                    response = e.response
+                    content = e.content
+                    response.status = 500
+                    response.reason = str(e)
+                elif isinstance(e, socket.timeout):
+                    content = b"Request Timeout"
+                    response = Response({
+                        "content-type": "text/plain",
+                        "status": "408",
+                        "content-length": len(content)
+                    })
+                    response.reason = "Request Timeout"
+                else:
+                    content = str(e).encode('utf-8')
+                    response = Response({
+                        "content-type": "text/plain",
+                        "status": "400",
+                        "content-length": len(content)
+                    })
+                    response.reason = "Bad Request"
+            else:
+                raise
+
+
+        return (response, content)
+
+
+
+class Response(dict):
+    """An object more like email.message than httplib.HTTPResponse."""
+
+    """Is this response from our local cache"""
+    fromcache = False
+
+    """HTTP protocol version used by server. 10 for HTTP/1.0, 11 for HTTP/1.1. """
+    version = 11
+
+    "Status code returned by server. "
+    status = 200
+
+    """Reason phrase returned by server."""
+    reason = "Ok"
+
+    previous = None
+
+    def __init__(self, info):
+        # info is either an email.message or
+        # an httplib.HTTPResponse object.
+        if isinstance(info, http.client.HTTPResponse):
+            for key, value in info.getheaders():
+                key = key.lower()
+                prev = self.get(key)
+                if prev is not None:
+                    value = ', '.join((prev, value))
+                self[key] = value
+            self.status = info.status
+            self['status'] = str(self.status)
+            self.reason = info.reason
+            self.version = info.version
+        elif isinstance(info, email.message.Message):
+            for key, value in list(info.items()):
+                self[key.lower()] = value
+            self.status = int(self['status'])
+        else:
+            for key, value in info.items():
+                self[key.lower()] = value
+            self.status = int(self.get('status', self.status))
+
+
+    def __getattr__(self, name):
+        if name == 'dict':
+            return self
+        else:
+            raise AttributeError(name)