HttpServer: avoid DCHECK'ing on non-HTTP/1.1 requests.

net/http/http_util.h

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef NET_HTTP_HTTP_UTIL_H_
 #define NET_HTTP_HTTP_UTIL_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 22 matching lines @@
   static std::string SpecForRequest(const GURL& url);
 
   // Locates the next occurance of delimiter in line, skipping over quoted
   // strings (e.g., commas will not be treated as delimiters if they appear
   // within a quoted string).  Returns the offset of the found delimiter or
   // line.size() if no delimiter was found.
   static size_t FindDelimiter(const std::string& line,
                               size_t search_start,
                               char delimiter);
 
+  // Parses an "HTTP/X.Y" version from a string, such as:
+  //   "HTTP/1.1"
+  // Returns whether or not the version string was successfully parsed.
+  static bool ParseVersion(const std::string& version_str,
+                           HttpVersion* version);
+
   // Parses the value of a Content-Type header.  The resulting mime_type and
   // charset values are normalized to lowercase.  The mime_type and charset
   // output values are only modified if the content_type_str contains a mime
   // type and charset value, respectively.  The boundary output value is
   // optional and will be assigned the (quoted) value of the boundary
   // paramter, if any.
   static void ParseContentType(const std::string& content_type_str,
                                std::string* mime_type,
                                std::string* charset,
                                bool* had_charset,
@@ skipping 297 matching lines @@
     // into the original's unquoted_value_ member.
     std::string unquoted_value_;
 
     bool value_is_quoted_;
   };
 };
 
 }  // namespace net
 
 #endif  // NET_HTTP_HTTP_UTIL_H_