nodejs http patcher

http-patcher.js

var httpPatcher = function (http) {

  // Patch http request() method to capture request
  var originalRequestFn = http.request;
  http.request = function (options, requestCb) {
    console.log('>>> HTTP request >>>\n  ' + options.method + ' ' +
        (options.port === 443 ? 'https' : 'http') + '://' + options.host + options.path);

    // Patch http request() callback to capture response
    var originalRequestCb = requestCb;
    requestCb = function (res) {
      var responseBodyBuffer = [];
      res.on('data', function(chunk) {
        responseBodyBuffer[responseBodyBuffer.length] = chunk;
      });
      res.on('end', function() {
        console.log('>>> HTTP response >>>\n  ', responseBodyBuffer.join(''));
      });
      return originalRequestCb.apply(this, arguments);
    };

    // Make the request
    var req = originalRequestFn.call(http, options, requestCb);

    // Patch request write() method to capture request body
    var originalWriteFn = req.write; 
    req.write = function (data) {
      // Pretty-print URL-encoded body
      if (options.headers
          && options.headers['Content-Type']
          && options.headers['Content-Type'] === 'application/x-www-form-urlencoded') {
        console.log('>>> HTTP request body >>>\n ',
            decodeURIComponent(data).replace(/&/g, '\n  '));
      }
      // String dump other body encodings
      else {
        console.log('>>> HTTP request body >>>\n  ', data);
      }
      return originalWriteFn.apply(this, arguments);
    };

    return req;
  };
};

http = require('http');
https = require('https');

httpPatcher(http);
httpPatcher(https);