Class HeadersList

lib/web/fetch/headers.js:193–424

}

class HeadersList {
  /** @type {[string, string][]|null} */
  cookies = null

  sortedMap
  headersMap

  constructor (init) {
    if (init instanceof HeadersList) {
      this.headersMap = new Map(init.headersMap)
      this.sortedMap = init.sortedMap
      this.cookies = init.cookies === null ? null : [...init.cookies]
    } else {
      this.headersMap = new Map(init)
      this.sortedMap = null
    }
  }

  /**
   * @see https://fetch.spec.whatwg.org/#header-list-contains
   * @param {string} name
   * @param {boolean} isLowerCase
   */
  contains (name, isLowerCase) {
    // A header list list contains a header name name if list
    // contains a header whose name is a byte-case-insensitive
    // match for name.

    return this.headersMap.has(isLowerCase ? name : name.toLowerCase())
  }

  clear () {
    this.headersMap.clear()
    this.sortedMap = null
    this.cookies = null
  }

  /**
   * @see https://fetch.spec.whatwg.org/#concept-header-list-append
   * @param {string} name
   * @param {string} value
   * @param {boolean} isLowerCase
   */
  append (name, value, isLowerCase) {
    this.sortedMap = null

    // 1. If list contains name, then set name to the first such
    //    header’s name.
    const lowercaseName = isLowerCase ? name : name.toLowerCase()
    const exists = this.headersMap.get(lowercaseName)

    // 2. Append (name, value) to list.
    if (exists) {
      const delimiter = lowercaseName === 'cookie' ? '; ' : ', '
      this.headersMap.set(lowercaseName, {
        name: exists.name,
        value: `${exists.value}${delimiter}${value}`
      })