AU: HTTP success is not just 200, but anything in the 2xx range

libcurl_http_fetcher.cc

 // Copyright (c) 2009 The Chromium OS 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 "update_engine/libcurl_http_fetcher.h"
 #include <algorithm>
 #include "chromeos/obsolete_logging.h"
 
 using std::max;
 using std::make_pair;
@@ skipping 101 matching lines @@
         if (delegate_)
           delegate_->TransferComplete(this, false);  // success
       } else {
         g_timeout_add(5 * 1000,
                       &LibcurlHttpFetcher::StaticRetryTimeoutCallback,
                       this);
       }
       return false;
     } else {
       if (delegate_) {
-        // success is when http_response_code is 200
-        delegate_->TransferComplete(this, http_response_code == 200);
+        // success is when http_response_code is 2xx
+        bool success = (http_response_code >= 200) &&
+            (http_response_code < 300);
+        delegate_->TransferComplete(this, success);
       }
     }
   } else {
     // set up callback
     SetupMainloopSources();
   }
   return false;
 }
 
 size_t LibcurlHttpFetcher::LibcurlWrite(void *ptr, size_t size, size_t nmemb) {
@@ skipping 158 matching lines @@
     curl_handle_ = NULL;
   }
   if (curl_multi_handle_) {
     CHECK_EQ(curl_multi_cleanup(curl_multi_handle_), CURLM_OK);
     curl_multi_handle_ = NULL;
   }
   transfer_in_progress_ = false;
 }
 
 }  // namespace chromeos_update_engine