Opened 4 years ago

Closed 4 years ago

#1973 closed defect (duplicate)

Intermittent form body loss with concurrent HTTP2 POST requests

Reported by:… Owned by:
Priority: minor Milestone:
Component: nginx-core Version: 1.10.x
Keywords: Cc:…
uname -a: Linux debian 4.20.5-200.fc29.x86_64 #1 SMP Mon Jan 28 19:29:17 UTC 2019 x86_64 GNU/Linux
nginx -V: nginx version: nginx/1.10.3
built with OpenSSL 1.1.0f 25 May 2017 (running with OpenSSL 1.1.0j 20 Nov 2018)
TLS SNI support enabled
configure arguments: --with-cc-opt='-g -O2 -fdebug-prefix-map=/build/nginx-0TiIP5/nginx-1.10.3=. -fstack-protector-strong -Wformat -Werror=format-security -Wdate-time -D_FORTIFY_SOURCE=2' --with-ld-opt='-Wl,-z,relro -Wl,-z,now' --prefix=/usr/share/nginx --conf-path=/etc/nginx/nginx.conf --http-log-path=/var/log/nginx/access.log --error-log-path=/var/log/nginx/error.log --lock-path=/var/lock/nginx.lock --pid-path=/run/ --modules-path=/usr/lib/nginx/modules --http-client-body-temp-path=/var/lib/nginx/body --http-fastcgi-temp-path=/var/lib/nginx/fastcgi --http-proxy-temp-path=/var/lib/nginx/proxy --http-scgi-temp-path=/var/lib/nginx/scgi --http-uwsgi-temp-path=/var/lib/nginx/uwsgi --with-debug --with-pcre-jit --with-ipv6 --with-http_ssl_module --with-http_stub_status_module --with-http_realip_module --with-http_auth_request_module --with-http_v2_module --with-http_dav_module --with-http_slice_module --with-threads --with-http_addition_module --with-http_geoip_module=dynamic --with-http_gunzip_module --with-http_gzip_static_module --with-http_image_filter_module=dynamic --with-http_sub_module --with-http_xslt_module=dynamic --with-stream=dynamic --with-stream_ssl_module --with-mail=dynamic --with-mail_ssl_module --add-dynamic-module=/build/nginx-0TiIP5/nginx-1.10.3/debian/modules/nginx-auth-pam --add-dynamic-module=/build/nginx-0TiIP5/nginx-1.10.3/debian/modules/nginx-dav-ext-module --add-dynamic-module=/build/nginx-0TiIP5/nginx-1.10.3/debian/modules/nginx-echo --add-dynamic-module=/build/nginx-0TiIP5/nginx-1.10.3/debian/modules/nginx-upstream-fair --add-dynamic-module=/build/nginx-0TiIP5/nginx-1.10.3/debian/modules/ngx_http_substitutions_filter_module


This was originally reported here:, but it seems like it may be an nginx bug as it does not reproduce with apache.

Steps to Reproduce:

Send many HTTP/2.0 POST requests at once. The server is a Python APP run behind a reverse proxy using nginx

The sample JS script to do so is here:

Expected: server receives form body for all requests
Actual: server intermittently receives no form body for some requests. This does not reproduce using HTTP/1.1.

There's a pcap dump between Firefox and Nginx here:

Change History (1)

comment:1 by Maxim Dounin, 4 years ago

Resolution: duplicate
Status: newclosed

The 1.10.3 is the version obsolete more than 3 years ago. Further, in this version HTTP/2 module was considered to be experimental. Using nginx 1.10.3, and, more importantly, using it with HTTP/2, is not a good idea unless you understand what you are doing and why.

The particular problem looks very similar to the one fixed three years ago in nginx 1.13.6:

    *) Bugfix: when using HTTP/2 client request body might be corrupted.

Details can be found in revision b6dc472299da and ticket #1384.

Please upgrade nginx version you are using. If your OS doesn't provide a newer version, consider using packages as available from

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