node_modules

node_modules/engine.io/lib/transports/polling-xhr.js

@@ -0,0 +1,69 @@
+
+/**
+ * Module dependencies.
+ */
+
+var Polling = require('./polling');
+var util = require('util');
+
+/**
+ * Module exports.
+ */
+
+module.exports = XHR;
+
+/**
+ * Ajax polling transport.
+ *
+ * @api public
+ */
+
+function XHR (req) {
+  Polling.call(this, req);
+}
+
+/**
+ * Inherits from Polling.
+ */
+
+util.inherits(XHR, Polling);
+
+/**
+ * Overrides `onRequest` to handle `OPTIONS`..
+ *
+ * @param {http.IncomingMessage}
+ * @api private
+ */
+
+XHR.prototype.onRequest = function (req) {
+  if ('OPTIONS' === req.method) {
+    var res = req.res;
+    var headers = this.headers(req);
+    headers['Access-Control-Allow-Headers'] = 'Content-Type';
+    res.writeHead(200, headers);
+    res.end();
+  } else {
+    Polling.prototype.onRequest.call(this, req);
+  }
+};
+
+/**
+ * Returns headers for a response.
+ *
+ * @param {http.IncomingMessage} request
+ * @param {Object} extra headers
+ * @api private
+ */
+
+XHR.prototype.headers = function (req, headers) {
+  headers = headers || {};
+
+  if (req.headers.origin) {
+    headers['Access-Control-Allow-Credentials'] = 'true';
+    headers['Access-Control-Allow-Origin'] = req.headers.origin;
+  } else {
+    headers['Access-Control-Allow-Origin'] = '*';
+  }
+
+  return Polling.prototype.headers.call(this, req, headers);
+};