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+=================
+FastCGI Internals
+=================
+
+---------------
+Module: fastcgi
+---------------
+
+:Author: Jan Kneschke
+:Date: $Date: 2004/08/01 07:01:29 $
+:Revision: $Revision: 1.1 $
+
+:abstract:
+  This is a short summary of the state-engine which is driving the FastCGI
+  module. It describes the basic concepts and the way the different parts
+  of the module are connected.
+
+.. meta::
+  :keywords: lighttpd, state-engine, fastcgi
+
+.. contents:: Table of Contents
+
+Description
+===========
+
+States
+------
+
+The state-engine is currently made of 6 states which are walk-through on
+the way each connection.
+
+:init:
+  prepare fastcgi-connection
+:connect:
+  waiting for a connection
+:prepwrite:
+  build the fastcgi-request
+:write:
+  write the fastcgi-request to the network
+:read:
+  read fastcgi-response from network and push it to the write-queue
+:close:
+  terminate the connection
+
+.. image:: fastcgi-state.png
+
+Delays
+------
+
+connect, write and read may need to wait for an fdevent. That's the reason
+for the loop in the state-diagram.