How to check that $request_body has some string and use it like a caching key?

qzpmwo nginx-forum at
Fri Sep 16 03:09:15 UTC 2011

Hi everybody,

I have the following situation:

Incoming request with method POST has binary body. I would like to
extract piece(s) from the payload to use it like a caching key. 

Something like:

if ( $request_body ~* (action.*) ) {
    set $key $1;
proxy_cache_key $uri|$key

Unfortunately it does not work for me even if I specified (like Igor

 client_max_body_size 1k;

I also tried client_body_buffer_size 1k; but it did not help either.

In the error.log with debug on I can see that $request_body has value,
but it never matches my condition, so $key is always empty.

Just in case I'm repeating, that request_body is binary. It has 0x00 as
well as everything else. It is AMF data.

Any advices?

--->>> qzpmwo <<<---

Posted at Nginx Forum:,215279,215279#msg-215279

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