{"ast":null,"code":"'use strict';\n\nvar utils = require('./../utils'); // Headers whose duplicates are ignored by node\n// c.f. https://nodejs.org/api/http.html#http_message_headers\n\n\nvar ignoreDuplicateOf = ['age', 'authorization', 'content-length', 'content-type', 'etag', 'expires', 'from', 'host', 'if-modified-since', 'if-unmodified-since', 'last-modified', 'location', 'max-forwards', 'proxy-authorization', 'referer', 'retry-after', 'user-agent'];\n/**\n * Parse headers into an object\n *\n * ```\n * Date: Wed, 27 Aug 2014 08:58:49 GMT\n * Content-Type: application/json\n * Connection: keep-alive\n * Transfer-Encoding: chunked\n * ```\n *\n * @param {String} headers Headers needing to be parsed\n * @returns {Object} Headers parsed into an object\n */\n\nmodule.exports = function parseHeaders(headers) {\n  var parsed = {};\n  var key;\n  var val;\n  var i;\n\n  if (!headers) {\n    return parsed;\n  }\n\n  utils.forEach(headers.split('\\n'), function parser(line) {\n    i = line.indexOf(':');\n    key = utils.trim(line.substr(0, i)).toLowerCase();\n    val = utils.trim(line.substr(i + 1));\n\n    if (key) {\n      if (parsed[key] && ignoreDuplicateOf.indexOf(key) >= 0) {\n        return;\n      }\n\n      if (key === 'set-cookie') {\n        parsed[key] = (parsed[key] ? parsed[key] : []).concat([val]);\n      } else {\n        parsed[key] = parsed[key] ? parsed[key] + ', ' + val : val;\n      }\n    }\n  });\n  return parsed;\n};","map":null,"metadata":{},"sourceType":"script"}