Upstream foreign fetch tests.

third_party/WebKit/LayoutTests/external/wpt/service-workers/service-worker/resources/fetch-access-control.py

 import base64
 import json
 
 def main(request, response):
     headers = []
     headers.append(('X-ServiceWorker-ServerHeader', 'SetInTheServer'))
 
     if "ACAOrigin" in request.GET:
         for item in request.GET["ACAOrigin"].split(","):
             headers.append(("Access-Control-Allow-Origin", item))
 
     for suffix in ["Headers", "Methods", "Credentials"]:
         query = "ACA%s" % suffix
         header = "Access-Control-Allow-%s" % suffix
         if query in request.GET:
             headers.append((header, request.GET[query]))
 
     if "ACEHeaders" in request.GET:
-        headers.append(("Access-Control-Expose-Headers", request.GET[query]))
+        headers.append(("Access-Control-Expose-Headers", request.GET["ACEHeaders"]))
 
     if ("Auth" in request.GET and not request.auth.username) or "AuthFail" in request.GET:
         status = 401
         headers.append(('WWW-Authenticate', 'Basic realm="Restricted"'))
         body = 'Authentication canceled'
         return status, headers, body
 
     if "PNGIMAGE" in request.GET:
         headers.append(("Content-Type", "image/png"))
         body = base64.decodestring("iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAAXNSR0IArs4c6QAAAARnQU1B"
@@ skipping 30 matching lines @@
             "headers": headers_data,
             "body": request.body,
             "files": files,
             "GET": get_data,
             "POST": post_data,
             "username": username,
             "password": password,
             "cookie": cookie}
 
     return headers, "report( %s )" % json.dumps(data)