Opened 3 years ago

Closed 3 years ago

#2251 closed defect (worksforme)

"underscores_in_headers on" didn't work

Reported by: dangnhutoan@… Owned by:
Priority: blocker Milestone: nginx-1.21
Component: documentation Version:
Keywords: underscores_in_headers Cc:
uname -a: Linux 3.10.0-1127.el7.x86_64 #1 SMP Tue Mar 31 23:36:51 UTC 2020 x86_64 x86_64 x86_64 GNU/Linux
nginx -V: nginx version: nginx/1.20.1
built by gcc 4.8.5 20150623 (Red Hat 4.8.5-44) (GCC)
built with OpenSSL 1.1.1g FIPS 21 Apr 2020
TLS SNI support enabled
configure arguments: --prefix=/usr/share/nginx --sbin-path=/usr/sbin/nginx --modules-path=/usr/lib64/nginx/modules --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --http-client-body-temp-path=/var/lib/nginx/tmp/client_body --http-proxy-temp-path=/var/lib/nginx/tmp/proxy --http-fastcgi-temp-path=/var/lib/nginx/tmp/fastcgi --http-uwsgi-temp-path=/var/lib/nginx/tmp/uwsgi --http-scgi-temp-path=/var/lib/nginx/tmp/scgi --pid-path=/run/ --lock-path=/run/lock/subsys/nginx --user=nginx --group=nginx --with-compat --with-debug --with-file-aio --with-google_perftools_module --with-http_addition_module --with-http_auth_request_module --with-http_dav_module --with-http_degradation_module --with-http_flv_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_image_filter_module=dynamic --with-http_mp4_module --with-http_perl_module=dynamic --with-http_random_index_module --with-http_realip_module --with-http_secure_link_module --with-http_slice_module --with-http_ssl_module --with-http_stub_status_module --with-http_sub_module --with-http_v2_module --with-http_xslt_module=dynamic --with-mail=dynamic --with-mail_ssl_module --with-pcre --with-pcre-jit --with-stream=dynamic --with-stream_ssl_module --with-stream_ssl_preread_module --with-threads --with-cc-opt='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -specs=/usr/lib/rpm/redhat/redhat-hardened-cc1 -m64 -mtune=generic' --with-ld-opt='-Wl,-z,relro -specs=/usr/lib/rpm/redhat/redhat-hardened-ld -Wl,-E'


The custom header can not pass to backend although set underscores_in_headers on in server block.

Another test, add "underscores_in_headers" on to http block of nginx.conf but still didn't work.

nginx version: nginx/1.20.1

Change History (2)

comment:1 by Maxim Dounin, 3 years ago

Works fine here. Test configuration:

server {
    listen 8080;
    underscores_in_headers on;

    location / {

Test with a header with an underscore:

$ curl -H 'Test_header: foo'

Simple test backend based on nc sees the test header:

$ nc -l 8081
GET / HTTP/1.0
Connection: close
User-Agent: curl/7.76.1
Accept: */*
Test_header: foo

The same test can be repeated with underscores_in_headers removed or moved to the http level, and/or via HTTP/2. In all tests underscores_in_headers works as expected.

If you see any issues with underscores_in_headers, please to provide details on how to reproduce it.

comment:2 by Maxim Dounin, 3 years ago

Resolution: worksforme
Status: newclosed

Feedback timeout.

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