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/*!
* Connect - responseTime
* Copyright(c) 2011 TJ Holowaychuk
* MIT Licensed
*/
/**
* 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 writeHead = res.writeHead
, start = new Date;
if (res._responseTime) return next();
res._responseTime = true;
// proxy writeHead to calculate duration
res.writeHead = function(status, headers){
var duration = new Date - start;
res.setHeader('X-Response-Time', duration + 'ms');
res.writeHead = writeHead;
res.writeHead(status, headers);
};
next();
};
};