A transporter can be constructed from a script run on demand by a full-feature web server like Apache.
A good start is to write a simple script like empty.cgi.
#! /usr/bin/perl print "Content-type: application/json\n\n"; print "{}\n"; close STDOUT;
Apache will pick up extra instructions from .htaccess.
Header add Access-Control-Allow-Origin "*" Header add Access-Control-Allow-Headers "content-type"
Try this by dragging a web page to this Transport plugin.
POST https://c2.com/cgi-bin/empty
Try with get: cgi 