Retry request upon GOAWAY frame with NO_ERROR.

net/base/net_error_list.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.
 
 // This file intentionally does not have header guards, it's included
 // inside a macro to generate enum values.
 
 // This file contains the list of network errors.
 
 //
@@ skipping 624 matching lines @@
 // either a failure to retrieve the DHCP configuration, or that there was no
 // PAC URL configured in DHCP.
 NET_ERROR(PAC_NOT_IN_DHCP, -348)
 
 // The HTTP response contained multiple Content-Disposition headers.
 NET_ERROR(RESPONSE_HEADERS_MULTIPLE_CONTENT_DISPOSITION, -349)
 
 // The HTTP response contained multiple Location headers.
 NET_ERROR(RESPONSE_HEADERS_MULTIPLE_LOCATION, -350)
 
-// SPDY server refused the stream. Client should retry. This should never be a
-// user-visible error.
+// HTTP/2 server refused the request without processing, and sent either a
+// GOAWAY frame with error code NO_ERROR and Last-Stream-ID lower than the
+// stream id corresponding to the request indicating that this request has not
+// been processed yet, or a RST_STREAM frame with error code REFUSED_STREAM.
+// Client MAY retry (on a different connection).  See RFC7540 Section 8.1.4.

[Zhongyi Shi, 2017/04/19 00:40:27]

optional nit: there're two spaces before "See RFC7540...". Is that on purpose?

[Bence, 2017/04/19 12:12:15]

I usually write two spaces between sentences by default, but do not have strong
feelings about it and am not aware of any guidance in any of our style guides. 
I am leaving this for the time being because you said "optional", but I am happy
to change it to a single space if you prefer.

[Zhongyi Shi, 2017/04/19 17:19:18]

Acknowledged.

 NET_ERROR(SPDY_SERVER_REFUSED_STREAM, -351)
 
 // SPDY server didn't respond to the PING message.
 NET_ERROR(SPDY_PING_FAILED, -352)
 
 // Obsolete.  Kept here to avoid reuse, as the old error can still appear on
 // histograms.
 // NET_ERROR(PIPELINE_EVICTION, -353)
 
 // The HTTP response body transferred fewer bytes than were advertised by the
@@ skipping 216 matching lines @@
 NET_ERROR(DNS_TIMED_OUT, -803)
 
 // The entry was not found in cache, for cache-only lookups.
 NET_ERROR(DNS_CACHE_MISS, -804)
 
 // Suffix search list rules prevent resolution of the given host name.
 NET_ERROR(DNS_SEARCH_EMPTY, -805)
 
 // Failed to sort addresses according to RFC3484.
 NET_ERROR(DNS_SORT_ERROR, -806)