code: function defaultExtractor(response) {
    // 204 NO CONTENT
    if (response.status === 204) {
      return undefined;
    }
  
    const contentTypeHeader = response.headers.get('Content-Type');
  
    if (!contentTypeHeader) {
      // This is the correct thing to do based on my interpretation of the HTTP specification:
      // https://www.w3.org/Protocols/rfc2616/rfc2616-sec7.html#sec7.2.1
      // return arrayBufferExtractor(response);
      // But, not supported by fetch polyfill so I just send as text.
      return textExtractor(response);
    }
  
    const type = contentType.parse(contentTypeHeader).type;
  
    if (type.match(/^application\/json/)) {
      return jsonExtractor(response);
    }
  
    if (type.match(/^image\//)) {
      return blobExtractor(response);
    }
  
    // By default try to extract as text?
    return textExtractor(response);
  }
docs: I am covering some basics, but honestly there's like a billion mime-types I don't know what the rules are for when to use which extraction method. It should be up to people to use the exported extractors themselves, or provide their own custom extractors in their method description.