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C (F)CGI for tunneling POST over GET for cross-site JSONP POST requests
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ABOUT: This is a C fastcgi/cgi that "mirrors" web services available via HTTP POST. The reason you might want to do this is to access off-site JSON data sources from scripts via JSONP. Because the trick behind JSONP is dynamically adding "<script>" nodes to the DOM with the DOM API, it's intrinsically limited to external scripts available with an HTTP "GET." This CGI lets you send HTTP POST data to off-site URLs, and retrieve the result, with an HTTP GET - it 'tunnels' GET to POST. OVERVIEW: jsonptunnel.cgi itself looks for two GET variables, one of which is required: REQUIRED PARAMETERS: 1. extURL - the URL to POST to. OPTIONAL PARAMETERS: 1. extCallback - wraps the off-site output with a function named this parameter, taking the returned data as its only parameter. Many JSONP web services provide their own 'callback' parameter; if they don't, you can use this. EXPLANATION: jsonptunnel sends any variables you specify in the query string other than the ext* variables to the target URL. LIVE EXAMPLE: http://labs.thinkminimo.com/jsonptunnel/ This is a page using Mootools with the JsonP extension from clientcide. It's an example of how to tunnel a POST request across domains to a simple web service that adds two numbers, and display the result. COMPILING: CGI: 1. make get-cgic 2. make cgi 3. copy jsonptunnel.cgi to your cgi-bin (or equivalent). FastCGI: 1. make get-cgic 2. make fcgi 3. Configure your web server to run jsonptunnel.fcgi. See "LIGHTTPD.EXAMPLE.CONF" for an example configuration. You may have to modify the Makefile variable FCGI_INCLUDE to point to the location of the FastCGI header files on your system. CAVEATS: To switch between fcgi and cgi builds, 'make clean' before running 'make cgi' or 'make fcgi.' DEPENDENCIES: 1. libcurl - http://curl.haxx.se/ 2. libcgic - http://www.boutell.com/cgic/ download and patch automatically with 'make get-cgic' command. 3. FastCGI - http://www.fastcgi.com/ jsonptunnel requires libcurl, libcgic, and fastcgi. libcurl is pretty common, libcgic is not. The 'make get-cgic' command downloads cgic into the current directory and a subsequent make command will build the library and link against it. THANKS: I'd like to thank the CURL team, Boutell.com, and the FastCGI guys for making such awesome software.