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#!rst 
=================
FastCGI Internals
=================

---------------
Module: fastcgi
---------------

.. contents:: Table of Contents

Description
===========

States
------

The FastCGI state machine currently consists of six states,
each of which is visited in turn as a connection is processed.

:init:
  prepare for a connection
:connect:
  wait for a connection
:prepwrite:
  build the request
:write:
  write the request to the network
:read:
  read the response from network and push it to the write queue
:close:
  terminate the connection

Delays
------

The connect, write, and read states may need to wait for an fdevent.
The delays are represented by loops in the state diagram below.

#!graphviz
digraph fcgistate {
  init -> connect -> prepwrite -> write -> read -> close
  write -> write
  read -> read
  connect -> connect
}