Method open

src/Fetch.js:63–89

* Initializes a request. * @param {string} method The HTTP request method (e.g., 'GET', 'POST'). * @param {string} url The URL to send the request to. * @param {boolean} [async=true] This parameter is ignored as Fetch is always async. * @param {string|null} [user=null] The username for b

(method, url, async = true, user = null, password = null)

   * @param {string|null} [password=null] The password for basic authentication.
   */
  open(method, url, async = true, user = null, password = null) {
    if (this.readyState !== 0 && this.readyState !== 4) {
      console.warn("FetchXHR.open() called while a request is in progress.");
      this.abort();
    }

    // Reset internal state for the new request
    this._method = method;
    this._url = url;
    this._headers = {};
    this._responseHeaders = null;

    // The async parameter is part of the XHR API but is an error here because
    // the Fetch API is inherently asynchronous and does not support synchronous requests.
    if (!async) {
      throw new Error("FetchXHR does not support synchronous requests.");
    }

    // Handle Basic Authentication if user/password are provided.
    // This creates a base64-encoded string and sets the Authorization header.
    if (user) {
      const credentials = btoa(`${user}:${password ?? ''}`);
      this._headers['Authorization'] = `Basic ${credentials}`;
    }

    this._changeReadyState(1); // 1: OPENED
  }

  /**
   * Sets the value of an HTTP request header.