}
                valueLines.add(line);
                while (!line.isEmpty() && contains(WHITE_SPACE, line.charAt(0))) {
                    line = line.substring(1, line.length());
                }
                buffer.append(line);
                if (!combine) {
                    break;
                }
            }
            return buffer.toString();

 */
class HeadersReader(
  val source: BufferedSource,
) {
  private var headerLimit = HEADER_LIMIT

  /** Read a single line counted against the header size limit. */
  fun readLine(): String {
    val line = source.readUtf8LineStrict(headerLimit)
    headerLimit -= line.length.toLong()
    return line
  }

  /** Reads headers or trailers. */

## Eine Anwendung mit Callbacks { #an-app-with-callbacks }

Sehen wir uns das alles anhand eines Beispiels an.

Stellen Sie sich vor, Sie entwickeln eine Anwendung, mit der Sie Rechnungen erstellen können.

Diese Rechnungen haben eine `id`, einen optionalen `title`, einen `customer` (Kunde) und ein `total` (Gesamtsumme).

   * '\n'}), a carriage return ({@code '\r'}), or a carriage return followed immediately by a
   * linefeed ({@code "\r\n"}).
   *
   * @return a {@code String} containing the contents of the line, not including any
   *     line-termination characters, or {@code null} if the end of the stream has been reached.
   * @throws IOException if an I/O error occurs
   */
  @CanIgnoreReturnValue // to skip a line

        for (String line : lines) {
            if (skipNext) {
                if (line.endsWith("\\") == false) {
                    skipNext = false;
                }
                continue;
            }

            // Skip lines with this comment - we remove the relevant config
            if (line.contains("old style pattern")) {
                skipNext = line.endsWith("\\");
                continue;

            String line = br.readLine();
            while (line != null) {
                lineNumber++;
                gatherDeadUserGuideLinksInLineReleaseNotes(sourceFile, line, lineNumber, errorsForFile);
                gatherDeadJavadocLinksInLineReleaseNotes(sourceFile, line, lineNumber, errorsForFile);

                line = br.readLine();
            }
        } catch (IOException e) {

          throw ProtocolException("Unexpected status line: $statusLine")
        }
        val httpMinorVersion = statusLine[7] - '0'
        codeStart = 9
        protocol =
          when (httpMinorVersion) {
            0 -> Protocol.HTTP_1_0
            1 -> Protocol.HTTP_1_1
            else -> throw ProtocolException("Unexpected status line: $statusLine")
          }
      } else if (statusLine.startsWith("ICY ")) {

            }
        }

        /**
         * Writes a raw line to the temporary file.
         *
         * @param line The line to write.
         * @throws DictionaryException if an I/O error occurs.
         */
        public void write(final String line) {
            try {
                writer.write(line);
                writer.write(Constants.LINE_SEPARATOR);

    }

    /**
     * Animate a typed line.
     * @param {Node} line - The line element to render.
     */
    async type(line) {
        const chars = [...line.textContent];
        line.textContent = '';
        this.container.appendChild(line);

        for (let char of chars) {
            const delay = line.getAttribute(`${this.pfx}-typeDelay`) || this.typeDelay;

{* ../../docs_src/stream_data/tutorial001_py310.py ln[44:47] hl[47] *}

## Eine benutzerdefinierte `PNGStreamingResponse` { #a-custom-pngstreamingresponse }

In den obigen Beispielen wurden die Datenbytes gestreamt, aber die Response hatte keinen `Content-Type`-Header, sodass der Client nicht wusste, welchen Datentyp er erhielt.