Beta Branch increase HTTP/2 http2_max_field_size and http2_max_header_size limits

increase HTTP/2 http2_max_field_size and http2_max_header_size limits

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for longer header field and header request sizes raise from HTTP/2 defaults of 4k and 16k respectively to 16k and 32k http://nginx.org/en/docs/http/ngx_http_v2_module.html.

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123.09beta01 branch

• Branch: https://github.com/centminmod/centminmod/tree/123.09beta01
• Commit History: https://github.com/centminmod/centminmod/commits/123.09beta01

 

For requests with very large header and header field sizes over HTTP/2 may run into nginx bad request 400 errors like below due to the defaults for http2_max_field_size and http2_max_header_size limits are 4k and 16k respectively.

nginx vhost domain's /home/nginx/domains/domain.com/log/error.log with info verbosity

Code (Text):

grep -v 'ngx_pagespeed' error.log | tail -20

Code (Text):

2016/03/20 06:20:19 [info] 6155#6155: *3 client timed out (110: Connection timed out) while waiting for request, IP, server: 0.0.0.0:443
2016/03/20 06:20:21 [info] 6156#6156: *16 client exceeded http2_max_field_size limit while processing HTTP/2 connection, client: IP, server: 0.0.0.0:443
2016/03/20 06:20:22 [info] 6155#6155: *20 client exceeded http2_max_field_size limit while processing HTTP/2 connection, client: IP, server: 0.0.0.0:443
2016/03/20 06:20:24 [info] 6155#6155: *15 client timed out (110: Connection timed out) while SSL handshaking, client: IP, server: 0.0.0.0:443
2016/03/20 06:20:45 [info] 6157#6157: *42 client closed connection while SSL handshaking, client: IP, server: 0.0.0.0:443
2016/03/20 06:20:46 [info] 6155#6155: *43 client IP closed keepalive connection
2016/03/20 06:26:30 [info] 9020#9020: *11 client exceeded http2_max_header_size limit while processing HTTP/2 connection, client: IP, server: 0.0.0.0:443
2016/03/20 06:26:31 [info] 9020#9020: *40 client exceeded http2_max_header_size limit while processing HTTP/2 connection, client: IP, server: 0.0.0.0:443
2016/03/20 06:26:38 [info] 9019#9019: *46 client exceeded http2_max_header_size limit while processing HTTP/2 connection, client: IP, server: 0.0.0.0:443

defaults for http2_max_field_size and http2_max_header_size limits are 4k and 16k respectively.

Updated Centmin Mod 123.09beta01 to add these 2 specific settings for HTTP/2 SSL generated Nginx vhosts on centmin.sh menu option 2 or menu option 22 or /usr/bin/nv generated vhost

Code (Text):

http2_max_field_size 16k;
http2_max_header_size 32k;

HTTP/2 SSL vhost config file context of where it's inserted

Code (Text):

  include /usr/local/nginx/conf/ssl_include.conf;

  http2_max_field_size 16k;
  http2_max_header_size 32k;
  # mozilla recommended

@deltahf seems to have hit those limits