Makeev Ivan 05d0b213a9 proxy: HTTP status 499 for 'Context canceled' errors (#2297)
* Adding {when_unix_ms} requests placeholder (unix timestamp with a milliseconds precision)

* Add an 499 HTTP status code on user's cancel request as NGINX doing (instead of 502 Bad Gateway status with 'Context canceled' message)

* 499 HTTP status code was added as constant CustomStatusContextCancelled = 499
2018-11-16 13:52:34 -07:00
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