docs: public FinishRequest toFinishRequest(boolean includeHeaders) {
          if (includeHeaders) {
              return new FinishRequest(body, copyHeaders(headers), statusCode);
          } else {
              String mime = null;
              if (body!=null) {
                  mime = "text/plain";
                  if (headers!=null && (headers.containsKey("Content-Type") || headers.containsKey("content-type"))) {
                      mime = headers.get("Content-Type");
                      if (mime==null) {
                          mime = headers.get("content-type");
                      }
                  }
              }
  
              return new FinishRequest(body, mime, statusCode);
          }
      }