Quellcode

{
    const open = XMLHttpRequest.prototype.open;
    XMLHttpRequest.prototype.open = function (method, url) {
      open.apply(this, arguments);
      this.addEventListener('readystatechange', function _() {
        if(this.readyState == this.HEADERS_RECEIVED) {
          const contentType = this.getResponseHeader('Content-Type') || '';
          if (contentType.startsWith('video/') || contentType.startsWith('audio/')) {
            window.postMessage({
              source: 'xmlhttprequest-open',
              url,
              mime: contentType,
              method,
              contentType
            }, '*');
          }
          this.removeEventListener('readystatechange', _);
        }
      })
    }
  }