Mastering Nginx

The NGINX HTTP Server

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Directive Explanation

fastcgi_next_upstream Indicates the conditions under which the

next FastCGI server will be selected for the

response. This won't be used if the client

has already been sent something. The

conditions are specified using the following

parameters:

• error: An error occurred while
  communicating with the FastCGI
  server


• timeout: A timeout occurred while
  communicating with the FastCGI
  server


• invalid_header: The FastCGI
  server returned an empty or
  otherwise invalid response


• http_500: The FastCGI server
  responded with a 500 error code


• http_503: The FastCGI server
  responded with a 503 error code


• http_404: The FastCGI server
  responded with a 404 error code


• off: Disables passing the request
  to the next FastCGI server when an
  error occurs
  fastcgi_no_cache One or more string variables, which when
  non-empty or non-zero, will instruct
  NGINX to not save the response from the
  FastCGI server in the cache.
  fastcgi_param Sets a parameter and its value to be passed
  to the FastCGI server. If the parameter
  should only be passed when the value is
  non-empty, the if_not_empty additional
  parameter should be set.
  fastcgi_pass Specifies the FastCGI server to which
  the request is passed, either as an
  address:port combination or as
  unix:path for a UNIX-domain socket.