Opened 6 weeks ago

Last modified 6 weeks ago

#2028 new enhancement

Why is it not possible to cache PUT requests (proxy_cache_methods)?

Reported by: Günter Grodotzki Owned by:
Priority: minor Milestone:
Component: nginx-core Version: 1.18.x
Keywords: Cc:
uname -a: Linux ea50807f1c4f 5.4.0-1021-aws #21-Ubuntu SMP Fri Jul 24 09:42:29 UTC 2020 x86_64 Linux
nginx -V: nginx version: nginx/1.18.0
built by gcc 9.2.0 (Alpine 9.2.0)
built with OpenSSL 1.1.1d 10 Sep 2019 (running with OpenSSL 1.1.1g 21 Apr 2020)
TLS SNI support enabled
configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --modules-path=/usr/lib/nginx/modules --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp --http-scgi-temp-path=/var/cache/nginx/scgi_temp --with-perl_modules_path=/usr/lib/perl5/vendor_perl --user=nginx --group=nginx --with-compat --with-file-aio --with-threads --with-http_addition_module --with-http_auth_request_module --with-http_dav_module --with-http_flv_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_mp4_module --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-mail --with-mail_ssl_module --with-stream --with-stream_realip_module --with-stream_ssl_module --with-stream_ssl_preread_module --with-cc-opt='-Os -fomit-frame-pointer' --with-ld-opt=-Wl,--as-needed

Description

According to https://github.com/nginx/nginx/blob/554916301c424f02b1cabc073845b64f8681099b/src/http/ngx_http_upstream.c#L454-L459 it is currently not possible to add PUT to proxy_cache_methods.

What is the reasoning behind this?

It would be great if I could cache PUT requests as well.

Change History (1)

comment:1 by Maxim Dounin, 6 weeks ago

Component: documentationnginx-core

This because HTTP specification explicitly defines that responses to PUT requests are not cacheable, RFC 7231:

Responses to the PUT method are not cacheable.

Further, no use cases are known where caching responses to PUT requests might be beneficial.

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