Use a better error message for bad status lines.

net/websockets/websocket_basic_handshake_stream.cc

 // Copyright 2013 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.
 
 #include "net/websockets/websocket_basic_handshake_stream.h"
 
 #include <algorithm>
 #include <iterator>
 #include <set>
 #include <string>
@@ skipping 547 matching lines @@
         return ValidateUpgradeResponse(headers);
 
       // We need to pass these through for authentication to work.
       case HTTP_UNAUTHORIZED:
       case HTTP_PROXY_AUTHENTICATION_REQUIRED:
         return OK;
 
       // Other status codes are potentially risky (see the warnings in the
       // WHATWG WebSocket API spec) and so are dropped by default.
       default:
-        failure_message_ = base::StringPrintf(
-            "Error during WebSocket handshake: Unexpected response code: %d",
-            headers->response_code());
+        // A WebSocket server cannot be using HTTP/0.9, so if we see version
+        // 0.9, it means the response was garbage.
+        // Reporting "Unexpected response code: 200" in this case is not
+        // helpful, so use a different error message.
+        if (headers->GetHttpVersion() == HttpVersion(0, 9)) {
+          failure_message_ =
+              "Error during WebSocket handshake: Invalid status line";
+        } else {
+          failure_message_ = base::StringPrintf(
+              "Error during WebSocket handshake: Unexpected response code: %d",
+              headers->response_code());
+        }
         OnFinishOpeningHandshake();
         return ERR_INVALID_RESPONSE;
     }
   } else {
     if (rv == ERR_EMPTY_RESPONSE) {
       failure_message_ =
           "Connection closed before receiving a handshake response";
       return rv;
     }
     failure_message_ =
@@ skipping 20 matching lines @@
                          &extensions_,
                          &failure_message_,
                          extension_params_.get())) {
     return OK;
   }
   failure_message_ = "Error during WebSocket handshake: " + failure_message_;
   return ERR_INVALID_RESPONSE;
 }
 
 }  // namespace net