[PATCH 1 of 2] HTTP: add support for "429 Too Many Requests" response (RFC6585)

[Piotr Sikora]

Hey,

> # HG changeset patch
> # User Piotr Sikora <piotrsikora at google.com>
> # Date 1476859139 25200
> #      Tue Oct 18 23:38:59 2016 -0700
> # Node ID 1eec5355ef1e4a8b0aecebdec84c744734c0d36e
> # Parent  8081e1f3ab8b9ccb4e2d7f9240cbfb8e404a3c95
> HTTP: add support for "429 Too Many Requests" response (RFC6585).
>
> This change adds reason phrase in status line and pretty response body
> when "429" status code is used in "return", "limit_conn_status" and/or
> "limit_req_status" directives.
>
> It also adds "http_429" parameter to "proxy_next_upstream" for retrying
> rate-limited requests, and to "proxy_cache_use_stale" for serving stale
> cached responses after being rate-limited.

Ping.

Best regards,
Piotr Sikora