lighttpd 1.4.x https://www.lighttpd.net/
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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.