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    <p>What you want is basically a very simple web server, but if all you want is printing out what comes in a HTTP POST request you can get away with using the built-in 'nc' command. You can use Terminal to print out the contents of incoming requests on local port 10000 by running 'nc' in a loop like this:</p> <pre><code>while true; do nc -l 10000 &lt; /dev/null ; printf '\n\n\n'; done </code></pre> <p>You can then go to <code>http://localhost:10000</code> in your browser and see the HTTP request appear in your Terminal window. The web browser will give an error message since 'nc' isn't smart enough to reply.</p> <p>To test an HTTP POST request you can use 'curl':</p> <pre><code>curl --data "this-is-POST-data" http://localhost:10000 </code></pre> <p>Again, curl will give an error message because 'nc' simply closes the connection without giving a proper HTTP reply. You can have 'nc' reply with a static HTTP response to all requests like this:</p> <pre><code>while true; do printf 'HTTP/1.0 200 OK\r\nContent-type: text-plain\r\n\r\nHello, world!' | nc -l 10000 ; printf '\n\n\n'; done </code></pre> <p>If you need to use port 80 you'll need to run 'nc' as root (e.g. using 'sudo').</p> <p>If you need to have any kind of real HTTP traffic going on, however, you will need to get a proper web server. OS X comes with the Apache web server which can be started with the command "apachectl start" ("apachectl stop" to stop it). CGI is enabled so you can put executables into /Library/WebServer/CGI-Executables and access them using <code>http://localhost/cgi-bin/filename</code>. For example, if you create the following CGI script:</p> <pre><code>#!/bin/sh printf 'Content-type: text/plain\r\n\r\n' cat &gt; /tmp/post-data echo OK </code></pre> <p>call it, say, "test.sh" and place it in the CGI-Executables folder, and run:</p> <pre><code>chmod +x /Library/WebServer/CGI-Executables/test.sh </code></pre> <p>Then, whenever you send a POST request to <code>http://localhost/cgi-bin/test.sh</code> it will save the contents of the POST data to the file /tmp/post-data on your computer.</p> <p>Note: in all examples, "localhost" can be replaced with "macbook-pro.local" for accesses over the network if that is your computer hostname.</p> <p>Also note that your OS X firewall permissions may block 'nc' and other software from listening to TCP ports. Usually you should get a permission dialog, but if you simply get "permission denied", tweak your firewall settings in System Preferences -> Firewall -> Firewall Options.</p>
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    1. COThe `nc` function is working greate, however the .sh file is not saving the post sent, but i do get the OK response back. Am i missing something? Does the .sh file need some terminal "Help"?
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    2. COUsing `while true; do nc -l 10000 < /dev/null ; printf 'Content-type: text/plain\r\n\r\n' cat > /MYDIR/post-data echo OK; done` saves the file but only with Content-type: text/plain and not the `POST`'s content..
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    3. COI got my answer, http://stackoverflow.com/questions/14762083/cgi-script-save-printf-to-file-using-terminal-os-x
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