Function Request

fetch.js:350–411

(input, options)

}

export function Request(input, options) {
  if (!(this instanceof Request)) {
    throw new TypeError('Please use the "new" operator, this DOM object constructor cannot be called as a function.')
  }

  options = options || {}
  var body = options.body

  if (input instanceof Request) {
    if (input.bodyUsed) {
      throw new TypeError('Already read')
    }
    this.url = input.url
    this.credentials = input.credentials
    if (!options.headers) {
      this.headers = new Headers(input.headers)
    }
    this.method = input.method
    this.mode = input.mode
    this.signal = input.signal
    if (!body && input._bodyInit != null) {
      body = input._bodyInit
      input.bodyUsed = true
    }
  } else {
    this.url = String(input)
  }

  this.credentials = options.credentials || this.credentials || 'same-origin'
  if (options.headers || !this.headers) {
    this.headers = new Headers(options.headers)
  }
  this.method = normalizeMethod(options.method || this.method || 'GET')
  this.mode = options.mode || this.mode || null
  this.signal = options.signal || this.signal || (function () {
    if ('AbortController' in g) {
      var ctrl = new AbortController();
      return ctrl.signal;
    }
  }());
  this.referrer = null

  if ((this.method === 'GET' || this.method === 'HEAD') && body) {
    throw new TypeError('Body not allowed for GET or HEAD requests')
  }
  this._initBody(body)

  if (this.method === 'GET' || this.method === 'HEAD') {
    if (options.cache === 'no-store' || options.cache === 'no-cache') {
      // Search for a '_' parameter in the query string
      var reParamSearch = /([?&])_=[^&]*/
      if (reParamSearch.test(this.url)) {
        // If it already exists then set the value with the current time
        this.url = this.url.replace(reParamSearch, '$1_=' + new Date().getTime())
      } else {
        // Otherwise add a new '_' parameter to the end with the current time
        var reQueryString = /\?/
        this.url += (reQueryString.test(this.url) ? '&' : '?') + '_=' + new Date().getTime()