miniprogram/node_modules/follow-redirects/index.js

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var url = require("url");
var http = require("http");
var https = require("https");
var assert = require("assert");
var Writable = require("stream").Writable;
var debug = require("debug")("follow-redirects");

// RFC7231§4.2.1: Of the request methods defined by this specification,
// the GET, HEAD, OPTIONS, and TRACE methods are defined to be safe.
var SAFE_METHODS = { GET: true, HEAD: true, OPTIONS: true, TRACE: true };

// Create handlers that pass events from native requests
var eventHandlers = Object.create(null);
["abort", "aborted", "error", "socket", "timeout"].forEach(function (event) {
  eventHandlers[event] = function (arg) {
    this._redirectable.emit(event, arg);
  };
});

// An HTTP(S) request that can be redirected
function RedirectableRequest(options, responseCallback) {
  // Initialize the request
  Writable.call(this);
  options.headers = options.headers || {};
  this._options = options;
  this._redirectCount = 0;
  this._redirects = [];
  this._requestBodyLength = 0;
  this._requestBodyBuffers = [];

  // Since http.request treats host as an alias of hostname,
  // but the url module interprets host as hostname plus port,
  // eliminate the host property to avoid confusion.
  if (options.host) {
    // Use hostname if set, because it has precedence
    if (!options.hostname) {
      options.hostname = options.host;
    }
    delete options.host;
  }

  // Attach a callback if passed
  if (responseCallback) {
    this.on("response", responseCallback);
  }

  // React to responses of native requests
  var self = this;
  this._onNativeResponse = function (response) {
    self._processResponse(response);
  };

  // Complete the URL object when necessary
  if (!options.pathname && options.path) {
    var searchPos = options.path.indexOf("?");
    if (searchPos < 0) {
      options.pathname = options.path;
    }
    else {
      options.pathname = options.path.substring(0, searchPos);