Lighttpd

this may be similar to 1.5 ticket:
http://redmine.lighttpd.net/issues/2497

the Connection: close and Content-Length: 0 are not needed, but i added to be sure these are not the issue. i also tested with HTTP/1.0 and HTTP/1.1 both, no difference.

php-fcgi test:

<?php
header('HTTP/1.0 204 No Content');
header('Cache-Control: no-store, no-cache, must-revalidate');
header('Connection: close');
header('Content-Length: 0');
exit(0);

output:

$ wget -O /dev/null -S --tries=1 --cache=off --no-check-certificate 'localhost/stats.php?$(date +%s)'
--2013-12-06 16:33:13--  http://localhost/stats.php?$(date%20+%25s)
Resolving localhost (localhost)... 127.0.0.1
Connecting to localhost (localhost)|127.0.0.1|:80... connected.
HTTP request sent, awaiting response... 
  HTTP/1.1 204 No Content
  Cache-Control: no-store, no-cache, must-revalidate
  Connection: close
  Content-type: text/html
  Date: Fri, 06 Dec 2013 14:33:13 GMT
  Server: lighttpd/1.4.32 (PLD Linux)
Length: unspecified [text/html]
Saving to: ‘/dev/null’

    [       <=>  ] 0           --.-K/s   in 5,7s    

2013-12-06 16:33:19 (0,00 B/s) - ‘/dev/null’ saved [0]

ruby test:

#!/usr/bin/ruby
require "fcgi" 

FCGI.each {|request|
  out = request.out
  out.print "Status: 204 No Content\r\n" 
  out.print "Content-Type: text/plain\r\n" 
  out.print "Cache-Control: no-store, no-cache, must-revalidate\r\n" 
  out.print "Connection: close\r\n" 
  out.print "Content-Length: 0\r\n" 
  out.print "\r\n" 
  request.finish
}

output:

+ wget -O /dev/null -S --tries=1 --cache=off --no-check-certificate 'localhost/test204.rb?1386342294'
--2013-12-06 17:04:54--  http://localhost/test204.rb?1386342294
Resolving localhost (localhost)... 127.0.0.1
Connecting to localhost (localhost)|127.0.0.1|:80... connected.
HTTP request sent, awaiting response... 
  HTTP/1.1 204 No Content
  Content-Type: text/plain
  Cache-Control: no-store, no-cache, must-revalidate
  Connection: close
  Date: Fri, 06 Dec 2013 15:04:54 GMT
  Server: lighttpd/1.4.32 (PLD Linux)
Length: unspecified [text/plain]
Saving to: ‘/dev/null’

    [       <=>    ] 0           --.-K/s   in 5,7s    

2013-12-06 17:05:00 (0,00 B/s) - ‘/dev/null’ saved [0]

note the "in 5.7s" in output, the request ran for 5+ seconds