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node_modules/connect/lib/middleware/responseTime.js

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+
+/*!
+ * Connect - responseTime
+ * Copyright(c) 2011 TJ Holowaychuk
+ * MIT Licensed
+ */
+
+/**
+ * Reponse time:
+ *
+ * Adds the `X-Response-Time` header displaying the response
+ * duration in milliseconds.
+ *
+ * @return {Function}
+ * @api public
+ */
+
+module.exports = function responseTime(){
+  return function(req, res, next){
+    var start = new Date;
+
+    if (res._responseTime) return next();
+    res._responseTime = true;
+
+    res.on('header', function(){
+      var duration = new Date - start;
+      res.setHeader('X-Response-Time', duration + 'ms');
+    });
+
+    next();
+  };
+};