A POST should also work, until you explicitly banned it (like they did for the Gamestudio manual).
Here is the output from one of my server scripts:
HTTP/1.1 200 OK
Date: Fri, 05 Nov 2010 08:29:04 GMT
Server: Apache
Vary: Accept-Encoding
Connection: close
Transfer-Encoding: Identity
Content-Type: text/html
66308
(HTTP GET)
HTTP/1.1 200 OK
Date: Fri, 05 Nov 2010 08:27:13 GMT
Server: Apache
Vary: Accept-Encoding
Connection: close
Transfer-Encoding: Identity
Content-Type: text/html
66308
(HTTP POST)
As you can see, only the time in the header differs a bit, but I'm pretty sure that the http_sendPost() function already cropped this out of the answer.
However, like I already mentioned, there are scripts that don't allow HTTP POST, like the manual.
I got this response from
http://www.conitec.net/beta/http.htm
HTTP/1.1 405 Method Not Allowed
Date: Fri, 05 Nov 2010 08:30:42 GMT
Server: Apache
Allow: GET, HEAD, OPTIONS
Connection: close
Transfer-Encoding: Identity
Content-Type: text/html; charset=iso-8859-1
<!DOCTYPE HTML PUBLIC "-//IETF//DTD HTML 2.0//EN">
<HTML><HEAD>
<TITLE>405 Method Not Allowed</TITLE>
</HEAD><BODY>
<H1>Method Not Allowed</H1>
The requested method POST is not allowed for the URL /beta/http.htm.<P>
</BODY></HTML>
.
