Include headers when proxying post requests

Author: reynaldot

proxy.js

@@ -67,6 +67,13 @@ exports.proxy = function(req, res, options, buffer){
 		options.headers['content-length'] = req.headers['content-length'] || '0';
 	}
 
+	if (options.method === 'POST') {
+		if (!options.headers) {
+			options.headers = {};
+		}
+		options.headers['content-type'] = req.headers['content-type'];
+	}
+
 	options.agent = false;