How to force nginx to cache HTTP POST response for few seconds

[Igor Sysoev]

On Thu, Sep 15, 2011 at 01:43:38AM -0400, qzpmwo wrote:
> Hi everybody,
> 
> I'm a newbie with nginx and would like to ask your help. On potentially
> very high loaded site I would like to cache response to the HTTP POST
> for the few seconds. Works perfectly for GETs, but...
> 
> nginx version: nginx/0.8.54
> 
> Please see below my config:  
> 
> proxy_cache_path /tmp/nginx levels=2:2:2 keys_zone=small:1m inactive=1m
> max_size=10m;
> 
> server {
> 
> log_format main '$remote_addr $host $remote_user [$time_local]
>       "$request" $status $body_bytes_sent "$http_referer"
>       "$http_user_agent" "$gzip_ratio"';
> 
>     access_log /var/log/nginx/test_server.access.log main buffer=32k;
>     error_log /var/log/nginx/test_server.error.log info;
> 
> 
>     listen       80;
> 
>     root   /var/www/html/nginx;
>     index  index.html index.htm;
> 
>     location / {
>         try_files $uri @apache_backend;
>     }
> 
> ###    location ~ \.php$ {
> ###        proxy_pass http://127.0.0.1:88;
> ###    }
> 
>     location @apache_backend {
>         proxy_pass http://127.0.0.1:88;
> proxy_cache small;
> proxy_cache_valid 5s;
> proxy_cache_key $uri;
> proxy_cache_use_stale updating;
> add_header X-Cached $upstream_cache_status;
>     }
> }
> 
> 
> Any help/advices will be appreciated.

You should upgrade to at least 0.8.55.
If POST request body is small enough, then you can use:

    location @apache_backend {
        ...
        proxy_cache_methods   POST;
        proxy_cache_key       "$uri|$request_body";
        client_max_body_size  1k;
    }


-- 
Igor Sysoev