Apache HTTP Server Version 2.4

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# Apache Module mod_proxy_fcgi

Available Languages: en | fr

Description: | FastCGI support module for `mod_proxy`
Status: | Extension
Module Identifier: | proxy_fcgi_module
Source File: | mod_proxy_fcgi.c
Compatibility: | Available in version 2.3 and later

### Summary

This module requires the service of `mod_proxy`. It provides support for the FastCGI protocol.

Thus, in order to get the ability of handling the `FastCGI` protocol, `mod_proxy` and `mod_proxy_fcgi` have to be present in the server.

Unlike mod_fcgid and mod_fastcgi, `mod_proxy_fcgi` has no provision for starting the application process; `fcgistarter` is provided (on some platforms) for that purpose. Alternatively, external launching or process management may be available in the FastCGI application framework in use.

### Warning

Do not enable proxying until you have secured your server. Open proxy servers are dangerous both to your network and to the Internet at large.

### Topics

- Examples
- Environment Variables

### Directives

This module provides no directives.

### Bugfix checklist

- httpd changelog
- Known issues
- Report a bug

### See also

- `fcgistarter`
- `mod_proxy`
- `mod_authnz_fcgi`
- Comments

## Examples

Remember, in order to make the following examples work, you have to enable `mod_proxy` and `mod_proxy_fcgi`.

### Single application instance

    ProxyPass "/myapp/" "fcgi://localhost:4000/"

`mod_proxy_fcgi` disables connection reuse by default, so after a request has been completed the connection will NOT be held open by that httpd child process and won't be reused. If the FastCGI application is able to handle concurrent connections from httpd, you can opt-in to connection reuse as shown in the following example:

### Single application instance, connection reuse (2.4.11 and later)

    ProxyPass "/myapp/" "fcgi://localhost:4000/" enablereuse=on

The following example passes the request URI as a filesystem path for the PHP-FPM daemon to run. The request URL is implicitly added to the 2nd parameter. The hostname and port following fcgi:// are where PHP-FPM is listening. Connection pooling is enabled.

### PHP-FPM

    ProxyPassMatch "^/myapp/.*\.php(/.*)?$" "fcgi://localhost:9000/var/www/" enablereuse=on

The following example passes the request URI as a filesystem path for the PHP-FPM daemon to run. In this case, PHP-FPM is listening on a unix domain socket (UDS). Requires 2.4.9 or later. With this syntax, the hostname and optional port following fcgi:// are ignored.

### PHP-FPM with UDS

    # UDS does not currently support connection reuse
    ProxyPassMatch "^/(.*\.php(/.*)?)$" "unix:/var/run/php5-fpm.sock|fcgi://localhost/var/www/"

The balanced gateway needs `mod_proxy_balancer` and at least one load balancer algorithm module, such as `mod_lbmethod_byrequests`, in addition to the proxy modules listed above. `mod_lbmethod_byrequests` is the default, and will be used for this example configuration.

### Balanced gateway to multiple application instances

    ProxyPass "/myapp/" "balancer://myappcluster/"
    <Proxy "balancer://myappcluster/">
        BalancerMember "fcgi://localhost:4000"
        BalancerMember "fcgi://localhost:4001"
    </Proxy>

You can also force a request to be handled as a reverse-proxy request, by creating a suitable Handler pass-through. The example configuration below will pass all requests for PHP scripts to the specified FastCGI server using reverse proxy. This feature is available in Apache HTTP Server 2.4.10 and later. For performance reasons, you will want to define a worker representing the same fcgi:// backend. The benefit of this form is that it allows the normal mapping of URI to filename to occur in the server, and the local filesystem result is passed to the backend. When FastCGI is configured this way, the server can calculate the most accurate PATH_INFO.

### Proxy via Handler

    <FilesMatch "\.php$">
        # Note: The only part that varies is /path/to/app.sock
        SetHandler  "proxy:unix:/path/to/app.sock|fcgi://localhost/"
    </FilesMatch>

    # Define a matching worker.
    # The part that is matched to the SetHandler is the part that
    # follows the pipe. If you need to distinguish, "localhost; can
    # be anything unique.
    <Proxy "fcgi://localhost/" enablereuse=on max=10>
    </Proxy>

    <FilesMatch ...>
        SetHandler  "proxy:fcgi://localhost:9000"
    </FilesMatch>

    <FilesMatch ...>
        SetHandler  "proxy:balancer://myappcluster/"
    </FilesMatch>

## Environment Variables

In addition to the configuration directives that control the behaviour of `mod_proxy`, there are a number of environment variables that control the FCGI protocol provider:

proxy-fcgi-pathinfo
  When configured via `ProxyPass` or `ProxyPassMatch`, `mod_proxy_fcgi` will not set the PATH_INFO environment variable. This allows the backend FCGI server to correctly determine SCRIPT_NAME and Script-URI and be compliant with RFC 3875 section 3.3. If instead you need `mod_proxy_fcgi` to generate a "best guess" for PATH_INFO, set this env-var. This is a workaround for a bug in some FCGI implementations. This variable can be set to multiple values to tweak at how the best guess is chosen (In 2.4.11 and later only):
  first-dot
    PATH_INFO is split from the slash following the first "." in the URL.
  last-dot
    PATH_INFO is split from the slash following the last "." in the URL.
  full
    PATH_INFO is calculated by an attempt to map the URL to the local filesystem.
  unescape
    PATH_INFO is the path component of the URL, unescaped / decoded.
  any other value
    PATH_INFO is the same as the path component of the URL. Originally, this was the only proxy-fcgi-pathinfo option.

Available Languages: en | fr

## Comments

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