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34 lines
725 B
JavaScript
34 lines
725 B
JavaScript
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/*!
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* Connect - responseTime
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* Copyright(c) 2011 TJ Holowaychuk
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* MIT Licensed
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*/
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/**
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* Adds the `X-Response-Time` header displaying the response
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* duration in milliseconds.
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*
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* @return {Function}
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* @api public
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*/
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module.exports = function responseTime(){
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return function(req, res, next){
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var writeHead = res.writeHead
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, start = new Date;
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if (res._responseTime) return next();
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res._responseTime = true;
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// proxy writeHead to calculate duration
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res.writeHead = function(status, headers){
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var duration = new Date - start;
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res.setHeader('X-Response-Time', duration + 'ms');
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res.writeHead = writeHead;
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res.writeHead(status, headers);
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};
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next();
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};
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};
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