// If the object ETag matches with the specified ETag.
			writeHeaders()
			writeErrorResponse(ctx, w, errorCodes.ToAPIErr(ErrPreconditionFailed), r.URL)
			return true
		}
	}

	etagMatch := opts.PreserveETag != "" && isETagEqual(objInfo.ETag, opts.PreserveETag)
	vidMatch := opts.VersionID != "" && opts.VersionID == objInfo.VersionID
	if etagMatch && vidMatch {
		writeHeaders()

   */
  var sourceCount = 0

  val isClosed: Boolean
    get() = file == null

  @Throws(IOException::class)
  private fun writeHeader(
    prefix: ByteString,
    upstreamSize: Long,
    metadataSize: Long,
  ) {
    val header =
      Buffer().apply {
        write(prefix)
        writeLong(upstreamSize)
        writeLong(metadataSize)

		ModTime:    time.Now().Round(time.Second),
		PAXRecords: map[string]string{"uid": "2097152"},
		Format:     FormatPAX,
		Typeflag:   TypeReg,
	}
	if err := tw.WriteHeader(hdr); err != nil {
		t.Fatalf("tw.WriteHeader: %v", err)
	}
	if _, err := tw.Write(data); err != nil {
		t.Fatalf("tw.Write: %v", err)
	}
	if err := tw.Close(); err != nil {
		t.Fatalf("tw.Close: %v", err)
	}

		{"todo.txt", "Get animal handling license."},
	}
	for _, file := range files {
		hdr := &tar.Header{
			Name: file.Name,
			Mode: 0600,
			Size: int64(len(file.Body)),
		}
		if err := tw.WriteHeader(hdr); err != nil {
			log.Fatal(err)
		}
		if _, err := tw.Write([]byte(file.Body)); err != nil {
			log.Fatal(err)
		}
	}
	if err := tw.Close(); err != nil {
		log.Fatal(err)
	}

				gridLogIf(context.Background(), err, err.Error())
				w.WriteHeader(http.StatusInternalServerError)
			}
		}()
		if debugPrint {
			fmt.Printf("grid: Got a %s request for: %v\n", req.Method, req.URL)
		}
		ctx := req.Context()
		if err := authReq(req); err != nil {
			gridLogOnceIf(ctx, fmt.Errorf("auth %s: %w", req.RemoteAddr, err), req.RemoteAddr)
			w.WriteHeader(http.StatusForbidden)
			return
		}

    }

    private void reportErrors(Map<File, List<Error>> errors, File reportFile) {
        try (PrintWriter fw = new PrintWriter(new FileWriter(reportFile))) {
            writeHeader(fw);
            if (errors.isEmpty()) {
                fw.println("All clear!");
                return;
            }
            for (Map.Entry<File, List<Error>> e : errors.entrySet()) {

		}
		fw.rawCount = &countWriter{w: fw.comp}
		fw.header = h
		ow = fw
	}
	w.dir = append(w.dir, h)
	if err := writeHeader(w.cw, h); err != nil {
		return nil, err
	}
	// If we're creating a directory, fw is nil.
	w.last = fw
	return ow, nil
}

func writeHeader(w io.Writer, h *header) error {
	const maxUint16 = 1<<16 - 1
	if len(h.Name) > maxUint16 {
		return errLongName
	}

//	`http: proxy error: context canceled` printed by Golang
func (f *Forwarder) customErrHandler(w http.ResponseWriter, r *http.Request, err error) {
	if f.Logger != nil && err != context.Canceled {
		f.Logger(err)
	}
	w.WriteHeader(http.StatusBadGateway)
}

func (f *Forwarder) getURLFromRequest(req *http.Request) *url.URL {
	// If the Request was created by Go via a real HTTP request,  RequestURI will

// Some fields may not be populated.
//
// For forward compatibility, users that retrieve a Header from Reader.Next,
// mutate it in some ways, and then pass it back to Writer.WriteHeader
// should do so by creating a new Header and copying the fields
// that they are interested in preserving.
type Header struct {
	// Typeflag is the type of header entry.

			// To indicate disable keep-alive, server is shutting down.
			w.Header().Set("Connection", "close")

			// Add 1 minute retry header, incase-client wants to honor it
			w.Header().Set(RetryAfter, "60")

			w.WriteHeader(http.StatusServiceUnavailable)
			w.Write([]byte(http.ErrServerClosed.Error()))
			return
		}

		atomic.AddInt32(&srv.requestCount, 1)
		defer atomic.AddInt32(&srv.requestCount, -1)