Fastcgi_cache_bypass. Need some explain

Server NGINX
1

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.

–
Cheers,
Vit

2

Hello!

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

    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 D.
http://nginx.org/