Hello!

On Thu, Sep 11, 2014 at 12:01:00PM +0300, wishmaster wrote:

> Hi,
>
> I am attempting to configure nginx to avoid caching some data.
>
> map $http_x_requested_with $no_cache {
> default 0;
> "XMLHttpRequest" 1;
> }
>
> fastcgi_cache_bypass $no_cache;
> fastcgi_no_cache $no_cache;
>
> With above configuration exceptions works fine, but with below - not. Why?
>
> fastcgi_cache_bypass $http_x_requested_with;
> fastcgi_no_cache $http_x_requested_with;
>
> With above config all requests (not only with "X-Requested-With: XMLHttpRequest") is bypassed.

Most likely there is some subtle error in the configuration -
e.g., missing ";" after fastcgi_cache_bypass.

The fastcgi_cache_bypass gets an arbitrary number of arbitrary
parameters, and something like:

fastcgi_cache_bypass $http_x_requested_with
fastcgi_no_cache $http_x_requested_with;

is perfectly valid from syntax point of view, but really means
fastcgi_cache_bypass with the "$http_x_requested_with",
"fastcgi_no_cache" and "$http_x_requested_with" parameters. And
the "fastcgi_no_cache" parameter is always true, hence all
requests bypass the cache.

--
Maxim Dounin
http://nginx.org/

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