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    <p>The 1st way that I know of is using a regex against the $args parameter like so:</p> <pre><code> if ($args ~ "^(\w+)=") { </code></pre> <p>Or the 2nd way is to use the convenient $is_args like so:</p> <pre><code> if ($is_args != "") { </code></pre> <p><em>Remember that in <strong>both</strong> styles you need to put a space between the if and the opening parenthesis; "if (" not "if(" as well as a space after the closing parenthesis and the opening brace; ") {" rather than "){".</em></p> <p>Full example using the 1st style above, nginx.conf:</p> <pre><code>location ~^/static/photos/.* { include /etc/nginx/proxy.conf; if ($args ~ "^(\w+)=") { rewrite ^/static/photos/(.*)$ /DynamicPhotoQualitySwitch/photos/$1 break; expires 7d; proxy_pass http://foofoofoo.com; } } </code></pre> <p>Full example using the 2nd style above, nginx.conf:</p> <pre><code>location ~^/static/photos/.* { include /etc/nginx/proxy.conf; if ($is_args != "") { rewrite ^/static/photos/(.*)$ /DynamicPhotoQualitySwitch/photos/$1 break; expires 7d; proxy_pass http://foofoofoo.com; } } </code></pre> <p>Note that the proxy.conf include goes outside of the if statement.</p> <p>Version:</p> <pre><code>[nginx@hip1 ~]$ nginx -v nginx version: nginx/1.2.6 </code></pre> <p>And some info on the $args and $is_args variables:</p> <p><a href="http://nginx.org/en/docs/http/ngx_http_core_module.html">http://nginx.org/en/docs/http/ngx_http_core_module.html</a></p> <p>Reading the docs is always useful, I just discovered that $query_string is the same as $args, so where I have $args above, you could also use $query_string according to the docs.</p> <p><strong>IMPORTANT</strong></p> <p>It is important to note however, that <a href="http://wiki.nginx.org/IfIsEvil">If can be Evil!</a></p> <p>And therefore either <em>test thoroughly</em> or use the recommendation provided in the link above to change the URL inside location statement in a way similar to the example provided there, something like:</p> <pre><code> location ~^/static/photos/.* { error_page 418 = @dynamicphotos; recursive_error_pages on; if ($is_args != "") { return 418; } # Your default, if no query parameters exist: ... } location @dynamicphotos { # If query parameters are present: rewrite ^/static/photos/(.*)$ /DynamicPhotoQualitySwitch/photos/$1 break; expires 7d; include /etc/nginx/proxy.conf; proxy_pass http://foofoofoo.com; } </code></pre>
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