# Nginx

If you are using Nginx as a reverse-proxy cache, and as described in the [reverse proxies documentation section](../../up-and-running/reverse-proxies), you must bypass Nginx cache rules when profiling.

The instruction you must add to your Nginx configuration file depends on the Nginx module you are using.

**Using http\_fastcgi module**

```nginx
fastcgi_cache_bypass $http_x_blackfire_query;
fastcgi_pass_request_headers on;
```

> **Note**
>
> You may [refer to the http\_fastcgi module documentation](https://nginx.org/en/docs/http/ngx_http_fastcgi_module.html#fastcgi_cache_bypass).

**Using http\_proxy module**

```nginx
proxy_cache_bypass $http_x_blackfire_query;
proxy_pass_request_headers on;
```

> **Note**
>
> You may [refer to the http\_proxy module documentation](https://nginx.org/en/docs/http/ngx_http_proxy_module.html#proxy_cache_bypass).