# H2O

the optimized HTTP/1.x, HTTP/2 server

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## Configure > FastCGI Directives

This document describes the configuration directives of the FastCGI handler.

The configuration directives of the FastCGI handler can be categorized into two groups. `Fastcgi.connect` and `fastcgi.spawn` define the address (or the process) to which the requests should be sent. Other directives customize how the connections to the FastCGI processes should be maintained.

### `"fastcgi.connect"`

Description:

  The directive specifies the address at where the FastCGI daemon is running.

  If the argument is a mapping, following properties are recognized.

  `host`
    name (or IP address) of the server running the FastCGI daemon (ignored if `type` is `unix`)
  `port`
    TCP port number or path to the unix socket
  `type`
    either `tcp` (default) or `unix`

  If the argument is a scalar, the value is considered as a TCP port number and the host is assumed to be `127.0.0.1`.

  Example. Map `/app` to FastCGI daemon listening to `/tmp/fcgi.sock`

      hosts:
          "example.com:80":
              paths:
                  "/app":
                      fastcgi.connect:
                          port: /tmp/fcgi.sock
                          type: unix

Level:
  path, extension

### `"fastcgi.spawn"`

Description:

  The directive specifies the command to start the FastCGI process manager.

  In contrast to `fastcgi.connect` that connects to a FastCGI server running externally, this directive launches a FastCGI process manager under the control of H2O, and terminates it when H2O quits. The argument is a `/bin/sh -c` expression to be executed when H2O boots up. The HTTP server records the process id of the expression, and sends `SIGTERM` to the id when it exits.

  Example. Map `.php` files to 10 worker processes of `/usr/local/bin/php-cgi`

      file.custom-handler:
          extension:     .php
          fastcgi.spawn: "PHP_FCGI_CHILDREN=10 exec /usr/local/bin/php-cgi"

  As of version 1.4.0, the spawned process is run under the privileges of user specified by the `user` directive (in version 1.3.x, the FastCGI process was spawned under the privileges that spawned the H2O standalone server). It is possible to specify a different user for running the FastCGI process, by providing a mapping that contains an attribute named `user` together with an attribute named `command`.

  Example. Running FastCGI processes under user `fastcgi`

      file.custom-handler:
          extension:     .php
          fastcgi.spawn:
              command: "PHP_FCGI_CHILDREN=10 exec /usr/local/bin/php-cgi"
              user:    fastcgi

Level:
  path, extension

### `"fastcgi.timeout.io"`

Description:

  Sets the I/O timeout of connections to the FastCGI process in milliseconds.

Level:
  global, host, path, extension
Default:
  `

      fastcgi.timeout.io: 30000

  `

### `"fastcgi.timeout.keepalive"`

Description:

  Sets the keepl-alive timeout for idle connections in milliseconds.

  FastCGI connections will not be persistent if the value is set to zero (default).

Level:
  global, host, path, extension
Default:
  `

      fastcgi.timeout.keepalive: 0

  `

### `"fastcgi.send-delegated-uri"`

Description:

  Send the modified `HTTP_HOST` and `REQUEST_URI` being rewritten in case of internal redirect.

  In H2O, it is possible to perform internal redirects (a.k.a. delegations or URL rewrites) using the `redirect` directive or by returning `X-Reproxy-URL` headers from web applications. The directive specifies whether to send the original values to the FastCGI process (default), or if the rewritten values should be sent.

Level:
  global, host, path, extension
Default:
  `

      fastcgi.send-delegated-uri: OFF

  `