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url = require(\"url\");\nvar http = require(\"http\");\nvar https = require(\"https\");\nvar assert = require(\"assert\");\nvar Writable = require(\"stream\").Writable;\nvar debug = require(\"debug\")(\"follow-redirects\");\n\n// RFC7231§4.2.1: Of the request methods defined by this specification,\n// the GET, HEAD, OPTIONS, and TRACE methods are defined to be safe.\nvar SAFE_METHODS = { GET: true, HEAD: true, OPTIONS: true, TRACE: true };\n\n// Create handlers that pass events from native requests\nvar eventHandlers = Object.create(null);\n[\"abort\", \"aborted\", \"error\", \"socket\", \"timeout\"].forEach(function (event) {\n  eventHandlers[event] = function (arg) {\n    this._redirectable.emit(event, arg);\n  };\n});\n\n// An HTTP(S) request that can be redirected\nfunction RedirectableRequest(options, responseCallback) {\n  // Initialize the request\n  Writable.call(this);\n  options.headers = options.headers || {};\n  this._options = options;\n  this._redirectCount = 0;\n  this._redirects = [];\n  this._requestBodyLength = 0;\n  this._requestBodyBuffers = [];\n\n  // Since http.request treats host as an alias of hostname,\n  // but the url module interprets host as hostname plus port,\n  // eliminate the host property to avoid confusion.\n  if (options.host) {\n    // Use hostname if set, because it has precedence\n    if (!options.hostname) {\n      options.hostname = options.host;\n    }\n    delete options.host;\n  }\n\n  // Attach a callback if passed\n  if (responseCallback) {\n    this.on(\"response\", responseCallback);\n  }\n\n  // React to responses of native requests\n  var self = this;\n  this._onNativeResponse = function (response) {\n    self._processResponse(response);\n  };\n\n  // Complete the URL object when necessary\n  if (!options.pathname && options.path) {\n    var searchPos = options.path.indexOf(\"?\");\n    if (searchPos < 0) {\n      options.pathname = options.path;\n    }\n    else {\n      options.pathname = options.path.substring(0, searchPos);\n      options.search = options.path.substring(searchPos);\n    }\n  }\n\n  // Perform the first request\n  this._performRequest();\n}\nRedirectableRequest.prototype = Object.create(Writable.prototype);\n\n// Writes buffered data to the current native request\nRedirectableRequest.prototype.write = function (data, encoding, callback) {\n  // Validate input and shift parameters if necessary\n  if (!(typeof data === \"string\" || typeof data === \"object\" && (\"length\" in data))) {\n    throw new Error(\"data should be a string, Buffer or Uint8Array\");\n  }\n  if (typeof encoding === \"function\") {\n    callback = encoding;\n    encoding = null;\n  }\n\n  // Ignore empty buffers, since writing them doesn't invoke the callback\n  // https://github.com/nodejs/node/issues/22066\n  if (data.length === 0) {\n    if (callback) {\n      callback();\n    }\n    return;\n  }\n  // Only write when we don't exceed the maximum body length\n  if (this._requestBodyLength + data.length <= this._options.maxBodyLength) {\n    this._requestBodyLength += data.length;\n    this._requestBodyBuffers.push({ data: data, encoding: encoding });\n    this._currentRequest.write(data, encoding, callback);\n  }\n  // Error when we exceed the maximum body length\n  else {\n    this.emit(\"error\", new Error(\"Request body larger than maxBodyLength limit\"));\n    this.abort();\n  }\n};\n\n// Ends the current native request\nRedirectableRequest.prototype.end = function (data, encoding, callback) {\n  // Shift parameters if necessary\n  if (typeof data === \"function\") {\n    callback = data;\n    data = encoding = null;\n  }\n  else if (typeof encoding === \"function\") {\n    callback = encoding;\n    encoding = null;\n  }\n\n  // Write data and end\n  var currentRequest = this._currentRequest;\n  this.write(data || \"\", encoding, function () {\n    currentRequest.end(null, null, callback);\n  });\n};\n\n// Sets a header value on the current native request\nRedirectableRequest.prototype.setHeader = function (name, value) {\n  this._options.headers[name] = value;\n  this._currentRequest.setHeader(name, value);\n};\n\n// Clears a header value on the current native request\nRedirectableRequest.prototype.removeHeader = function (name) {\n  delete this._options.headers[name];\n  this._currentRequest.removeHeader(name);\n};\n\n// Proxy all other public ClientRequest methods\n[\n  \"abort\", \"flushHeaders\", \"getHeader\",\n  \"setNoDelay\", \"setSocketKeepAlive\", \"setTimeout\",\n].forEach(function (method) {\n  RedirectableRequest.prototype[method] = function (a, b) {\n    return this._currentRequest[method](a, b);\n  };\n});\n\n// Proxy all public ClientRequest properties\n[\"aborted\", \"connection\", \"socket\"].forEach(function (property) {\n  Object.defineProperty(RedirectableRequest.prototype, property, {\n    get: function () { return this._currentRequest[property]; },\n  });\n});\n\n// Executes the next native request (initial or redirect)\nRedirectableRequest.prototype._performRequest = function () {\n  // Load the native protocol\n  var protocol = this._options.protocol;\n  var nativeProtocol = this._options.nativeProtocols[protocol];\n  if (!nativeProtocol) {\n    this.emit(\"error\", new Error(\"Unsupported protocol \" + protocol));\n    return;\n  }\n\n  // If specified, use the agent corresponding to the protocol\n  // (HTTP and HTTPS use different types of agents)\n  if (this._options.agents) {\n    var scheme = protocol.substr(0, protocol.length - 1);\n    this._options.agent = this._options.agents[scheme];\n  }\n\n  // Create the native request\n  var request = this._currentRequest =\n        nativeProtocol.request(this._options, this._onNativeResponse);\n  this._currentUrl = url.format(this._options);\n\n  // Set up event handlers\n  request._redirectable = this;\n  for (var event in eventHandlers) {\n    /* istanbul ignore else */\n    if (event) {\n      request.on(event, eventHandlers[event]);\n    }\n  }\n\n  // End a redirected request\n  // (The first request must be ended explicitly with RedirectableRequest#end)\n  if (this._isRedirect) {\n    // Write the request entity and end.\n    var i = 0;\n    var buffers = this._requestBodyBuffers;\n    (function writeNext() {\n      if (i < buffers.length) {\n        var buffer = buffers[i++];\n        request.write(buffer.data, buffer.encoding, writeNext);\n      }\n      else {\n        request.end();\n      }\n    }());\n  }\n};\n\n// Processes a response from the current native request\nRedirectableRequest.prototype._processResponse = function (response) {\n  // Store the redirected response\n  if (this._options.trackRedirects) {\n    this._redirects.push({\n      url: this._currentUrl,\n      headers: response.headers,\n      statusCode: response.statusCode,\n    });\n  }\n\n  // RFC7231§6.4: The 3xx (Redirection) class of status code indicates\n  // that further action needs to be taken by the user agent in order to\n  // fulfill the request. If a Location header field is provided,\n  // the user agent MAY automatically redirect its request to the URI\n  // referenced by the Location field value,\n  // even if the specific status code is not understood.\n  var location = response.headers.location;\n  if (location && this._options.followRedirects !== false &&\n      response.statusCode >= 300 && response.statusCode < 400) {\n    // RFC7231§6.4: A client SHOULD detect and intervene\n    // in cyclical redirections (i.e., \"infinite\" redirection loops).\n    if (++this._redirectCount > this._options.maxRedirects) {\n      this.emit(\"error\", new Error(\"Max redirects exceeded.\"));\n      return;\n    }\n\n    // RFC7231§6.4: Automatic redirection needs to done with\n    // care for methods not known to be safe […],\n    // since the user might not wish to redirect an unsafe request.\n    // RFC7231§6.4.7: The 307 (Temporary Redirect) status code indicates\n    // that the target resource resides temporarily under a different URI\n    // and the user agent MUST NOT change the request method\n    // if it performs an automatic redirection to that URI.\n    var header;\n    var headers = this._options.headers;\n    if (response.statusCode !== 307 && !(this._options.method in SAFE_METHODS)) {\n      this._options.method = \"GET\";\n      // Drop a possible entity and headers related to it\n      this._requestBodyBuffers = [];\n      for (header in headers) {\n        if (/^content-/i.test(header)) {\n          delete headers[header];\n        }\n      }\n    }\n\n    // Drop the Host header, as the redirect might lead to a different host\n    if (!this._isRedirect) {\n      for (header in headers) {\n        if (/^host$/i.test(header)) {\n          delete headers[header];\n        }\n      }\n    }\n\n    // Perform the redirected request\n    var redirectUrl = url.resolve(this._currentUrl, location);\n    debug(\"redirecting to\", redirectUrl);\n    Object.assign(this._options, url.parse(redirectUrl));\n    this._isRedirect = true;\n    this._performRequest();\n\n    // Discard the remainder of the response to avoid waiting for data\n    response.destroy();\n  }\n  else {\n    // The response is not a redirect; return it as-is\n    response.responseUrl = this._currentUrl;\n    response.redirects = this._redirects;\n    this.emit(\"response\", response);\n\n    // Clean up\n    this._requestBodyBuffers = [];\n  }\n};\n\n// Wraps the key/value object of protocols with redirect functionality\nfunction wrap(protocols) {\n  // Default settings\n  var exports = {\n    maxRedirects: 21,\n    maxBodyLength: 10 * 1024 * 1024,\n  };\n\n  // Wrap each protocol\n  var nativeProtocols = {};\n  Object.keys(protocols).forEach(function (scheme) {\n    var protocol = scheme + \":\";\n    var nativeProtocol = nativeProtocols[protocol] = protocols[scheme];\n    var wrappedProtocol = exports[scheme] = Object.create(nativeProtocol);\n\n    // Executes a request, following redirects\n    wrappedProtocol.request = function (options, callback) {\n      if (typeof options === \"string\") {\n        options = url.parse(options);\n        options.maxRedirects = exports.maxRedirects;\n      }\n      else {\n        options = Object.assign({\n          protocol: protocol,\n          maxRedirects: exports.maxRedirects,\n          maxBodyLength: exports.maxBodyLength,\n        }, options);\n      }\n      options.nativeProtocols = nativeProtocols;\n      assert.equal(options.protocol, protocol, \"protocol mismatch\");\n      debug(\"options\", options);\n      return new RedirectableRequest(options, callback);\n    };\n\n    // Executes a GET request, following redirects\n    wrappedProtocol.get = function (options, callback) {\n      var request = wrappedProtocol.request(options, callback);\n      request.end();\n      return request;\n    };\n  });\n  return exports;\n}\n\n// Exports\nmodule.exports = wrap({ http: http, https: https });\nmodule.exports.wrap = wrap;\n","module.exports = require(\"./\").http;\n","module.exports = require(\"./\").https;\n"]}