/*! * Connect * Copyright(c) 2011 TJ Holowaychuk * MIT Licensed */ /** * Module dependencies. */ var http = require('http')  , res = http.OutgoingMessage.prototype; // original setHeader() var setHeader = res.setHeader; // original _renderHeaders() var _renderHeaders = res._renderHeaders; if (res._hasConnectPatch) return; /** * Provide a public "header sent" flag * until node does. * * @return {Boolean} * @api public */ res.__defineGetter__('headerSent', function(){  return this._headerSent;}); /** * Set header `field` to `val`, special-casing * the `Set-Cookie` field for multiple support. * * @param {String} field * @param {String} val * @api public */ res.setHeader = function(field, val){  var key = field.toLowerCase()    , prev;   // special-case Set-Cookie  if (this._headers && 'set-cookie' == key) {    if (prev = this.getHeader(field)) {      val = Array.isArray(prev)        ? prev.concat(val)        : [prev, val];    }  // charset  } else if ('content-type' == key && this.charset) {    val += '; charset=' + this.charset;  }   return setHeader.call(this, field, val);}; /** * Proxy `res.end()` to expose a 'header' event, * allowing arbitrary augmentation before the header * fields are written to the socket. * * NOTE: this _only_ supports node's progressive header * field API aka `res.setHeader()`. */ res._renderHeaders = function(){  this.emit('header');  return _renderHeaders.call(this);}; res._hasConnectPatch = true;