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1'use strict'2const http = require('http')3const { STATUS_CODES } = http4 5const Headers = require('./headers.js')6const Body = require('./body.js')7const { clone, extractContentType } = Body8 9const INTERNALS = Symbol('Response internals')10 11class Response extends Body {12  constructor (body = null, opts = {}) {13    super(body, opts)14 15    const status = opts.status || 20016    const headers = new Headers(opts.headers)17 18    if (body !== null && body !== undefined && !headers.has('Content-Type')) {19      const contentType = extractContentType(body)20      if (contentType) {21        headers.append('Content-Type', contentType)22      }23    }24 25    this[INTERNALS] = {26      url: opts.url,27      status,28      statusText: opts.statusText || STATUS_CODES[status],29      headers,30      counter: opts.counter,31      trailer: Promise.resolve(opts.trailer || new Headers()),32    }33  }34 35  get trailer () {36    return this[INTERNALS].trailer37  }38 39  get url () {40    return this[INTERNALS].url || ''41  }42 43  get status () {44    return this[INTERNALS].status45  }46 47  get ok () {48    return this[INTERNALS].status >= 200 && this[INTERNALS].status < 30049  }50 51  get redirected () {52    return this[INTERNALS].counter > 053  }54 55  get statusText () {56    return this[INTERNALS].statusText57  }58 59  get headers () {60    return this[INTERNALS].headers61  }62 63  clone () {64    return new Response(clone(this), {65      url: this.url,66      status: this.status,67      statusText: this.statusText,68      headers: this.headers,69      ok: this.ok,70      redirected: this.redirected,71      trailer: this.trailer,72    })73  }74 75  get [Symbol.toStringTag] () {76    return 'Response'77  }78}79 80module.exports = Response81 82Object.defineProperties(Response.prototype, {83  url: { enumerable: true },84  status: { enumerable: true },85  ok: { enumerable: true },86  redirected: { enumerable: true },87  statusText: { enumerable: true },88  headers: { enumerable: true },89  clone: { enumerable: true },90})91