Grunt connect proxy JSON requests. Proposed solution for a problem I describe at: http://jeltelagendijk.nl/2013/09/grunt-connect-json-api-cross-domain/

grunt-connect-proxy-requests.js

// Add this at the top of Gruntfile.js:
var request = require('request');


module.exports = function(grunt) {
  
  grunt.initConfig({
    
    // .........
    // other grunt tasks
    // .........
    
    // This is in your initConfig, add middleware to your grunt
    connect: {
      server: {
          options: {
              hostname:'*',
              port: 9001,
              base: 'dist',
              /*
                  Custom middleware to make sure JSON requests are working!
              */
              middleware : function(connect, options) {
                  return [
                      function(req,res,next) {
                          if (req.url.substring(0,5) == '/api/'){
                              request('http://www.domain.com'+req.url, function (err, response, body) {
                                  if (!err && response.statusCode == 200) {
                                      res.end(body);
                                  }
                              });
                          } else {
                              return next();
                          }
                      },
                      connect.static(require('path').resolve(options.base))
                  ];
              }
          }
      }
    }
    
    // .........
    // other grunt tasks
    // .........
    
  }
}

grunt.registerTask('dev', ['default','connect','watch:development']);
// run it using: grunt dev
// This will watch your files, start the connect-server and run various commands that are defined in the 'default' task

request is used to tunnel these api calls. Make sure request is added to package.json, then run npm install, this will make sure the package is installed. Also, at the top of your gruntfile, add this:

var request = require('request');

That should do the trick