5s hangs with http2 and variable-based proxy_pass
Valentin V. Bartenev
vbart at nginx.com
Mon Oct 10 11:58:36 UTC 2016
On Monday 10 October 2016 12:34:18 Chris West wrote:
> If you enable http2, our proxy setup develops 5s hangs, under load.
> This happens from at least Chrome/linux, Firefox/linux and Edge/win10.
> Any suggestions on how to further diagnose this problem, or work out
> where this "5 second" number is coming from? Full reproduction config
> and debug logs are attached, but I don't understand the debug logs.
> This isn't always reproducible, but happens frequently. Changing
> browser, restarting nginx, ... doesn't cause it to be immediately
> 2016/10/10 11:17:31 [debug] 4058#4058: *238 http2 frame complete
> pos:00007F536315501D end:00007F536315501D
> 2016/10/10 11:17:36 [debug] 4058#4058: *238 http upstream resolve:
> 2016/10/10 11:17:36 [debug] 4058#4058: *238 name was resolved to 126.96.36.199
> 2016/10/10 11:17:36 [debug] 4058#4058: *238 name was resolved to
Looks like the delay is created by your resolver (188.8.131.52 as set in your configuration).
Please, also check the documentation and don't use any public DNS in the resolver
| To prevent DNS spoofing, it is recommended configuring DNS servers in a properly
| secured trusted local network.
wbr, Valentin V. Bartenev
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