ngx_cache_purge is nginx module which adds ability to purge content from
FastCGI, proxy, SCGI and uWSGI caches. A purge operation removes the
content with the same cache key as the purge request has.
Work on the original patch was fully funded by yo.se.
This module is production-ready.
- syntax:
fastcgi_cache_purge on|off|<method> [purge_all] [from all|<ip> [.. <ip>]] - default:
none - context:
http,server,location
Allow purging of selected pages from FastCGI's cache.
- syntax:
proxy_cache_purge on|off|<method> [purge_all] [from all|<ip> [.. <ip>]] - default:
none - context:
http,server,location
Allow purging of selected pages from proxy's cache.
- syntax:
scgi_cache_purge on|off|<method> [purge_all] [from all|<ip> [.. <ip>]] - default:
none - context:
http,server,location
Allow purging of selected pages from SCGI's cache.
- syntax:
uwsgi_cache_purge on|off|<method> [purge_all] [from all|<ip> [.. <ip>]] - default:
none - context:
http,server,location
Allow purging of selected pages from uWSGI's cache.
- syntax:
fastcgi_cache_purge zone_name key - default:
none - context:
location
Sets area and key used for purging selected pages from FastCGI's cache.
- syntax:
proxy_cache_purge zone_name key - default:
none - context:
location
Sets area and key used for purging selected pages from proxy's cache.
- syntax:
scgi_cache_purge zone_name key - default:
none - context:
location
Sets area and key used for purging selected pages from SCGI's cache.
- syntax:
uwsgi_cache_purge zone_name key - default:
none - context:
location
Sets area and key used for purging selected pages from uWSGI's cache.
- syntax:
cache_purge_response_type html|json|xml|text - default:
html - context:
http,server,location
Sets a response type of purging result.
Sometimes it's not possible to pass the exact key cache to purge a page. For example; when the content of a cookie or the params are part of the key. You can specify a partial key adding an asterisk at the end of the URL.
curl -X PURGE /page*
The asterisk must be the last character of the key, so you must put the $uri variable at the end.
Caching requests that use the "Vary" header may result in multiple cache entries with the same cache key. For example, when using the request header "Vary: Accept-Encoding", a separate cache entry (with different file hash) will be stored for each content encoding (like compressed or uncompressed), but they will all have the exact same cache key.
Trying to purge such cached content will fail unless both the "Vary" header is specified in the purge request, plus all headers as listed in the "Vary" header, with the exact same values as used when the request was cached.
To be able to purge all pages with the same cache key, specify the key with a "$" at the end, like this:
curl -X PURGE /page$
This will purge all content with the exact key "/page" from the cache.
http {
proxy_cache_path /tmp/cache keys_zone=tmpcache:10m;
server {
location / {
proxy_pass http://127.0.0.1:8000;
proxy_cache tmpcache;
proxy_cache_key $uri$is_args$args;
proxy_cache_purge PURGE from 127.0.0.1;
}
}
}
http {
proxy_cache_path /tmp/cache keys_zone=tmpcache:10m;
server {
location / {
proxy_pass http://127.0.0.1:8000;
proxy_cache tmpcache;
proxy_cache_key $uri$is_args$args;
proxy_cache_purge PURGE purge_all from 127.0.0.1;
}
}
}
http {
proxy_cache_path /tmp/cache keys_zone=tmpcache:10m;
server {
location / {
proxy_pass http://127.0.0.1:8000;
proxy_cache tmpcache;
proxy_cache_key $uri$is_args$args;
}
location ~ /purge(/.*) {
allow 127.0.0.1;
deny all;
proxy_cache_purge tmpcache $1$is_args$args;
}
}
}
http {
proxy_cache_path /tmp/cache keys_zone=tmpcache:10m;
cache_purge_response_type text;
server {
cache_purge_response_type json;
location / { #json
proxy_pass http://127.0.0.1:8000;
proxy_cache tmpcache;
proxy_cache_key $uri$is_args$args;
}
location ~ /purge(/.*) { #xml
allow 127.0.0.1;
deny all;
proxy_cache_purge tmpcache $1$is_args$args;
cache_purge_response_type xml;
}
location ~ /purge2(/.*) { # json
allow 127.0.0.1;
deny all;
proxy_cache_purge tmpcache $1$is_args$args;
}
}
server {
location / { #text
proxy_pass http://127.0.0.1:8000;
proxy_cache tmpcache;
proxy_cache_key $uri$is_args$args;
}
location ~ /purge(/.*) { #text
allow 127.0.0.1;
deny all;
proxy_cache_purge tmpcache $1$is_args$args;
}
location ~ /purge2(/.*) { #html
allow 127.0.0.1;
deny all;
proxy_cache_purge tmpcache $1$is_args$args;
cache_purge_response_type html;
}
}
}
ngx_cache_purge comes with complete test suite based on Test::Nginx.
You can test it by running:
$ prove
Copyright (c) 2009-2014, FRiCKLE <info@frickle.com>
Copyright (c) 2009-2014, Piotr Sikora <piotr.sikora@frickle.com>
All rights reserved.
This project was fully funded by yo.se.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions
are met:
1. Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
2. Redistributions in binary form must reproduce the above copyright
notice, this list of conditions and the following disclaimer in the
documentation and/or other materials provided with the distribution.
THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
"AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.