synchronized ( this.inLock ) {
                    Long peekKey = peekKey();
                    if ( peekKey == firstKey ) {
                        doRecv(response);
                        response.received();
                        return response;
                    }
                    doSkip(peekKey);
                }
            }

    Thread thread;
    TransportException te;

    protected HashMap response_map = new HashMap( 4 );

    protected abstract void makeKey( Request request ) throws IOException;
    protected abstract Request peekKey() throws IOException;
    protected abstract void doSend( Request request ) throws IOException;
    protected abstract void doRecv( Response response ) throws IOException;
    protected abstract void doSkip() throws IOException;

            out.write( sbuf, 0, 4 + n );
            out.flush();
            /* Note the Transport thread isn't running yet so we can
             * read from the socket here.
             */
            if (peekKey() == null) /* try to read header */
                throw new IOException( "transport closed in negotiate" );
            int size = Encdec.dec_uint16be( sbuf, 2 ) & 0xFFFF;

         * read from the socket here.
         */
        try {
            this.socket.setSoTimeout(this.transportContext.getConfig().getConnTimeout());
            if ( peekKey() == null ) /* try to read header */
                throw new IOException("transport closed in negotiate");
        }
        finally {
            this.socket.setSoTimeout(this.transportContext.getConfig().getSoTimeout());

                      throws Exception {
                    closer.eventuallyClose(closeable1, closingExecutor);
                    assertThat(peeker.getDone(input1)).isSameInstanceAs("value1");
                    try {
                      peeker.getDone(input2Failed);
                      fail("Peeker should fail for failed inputs");

                      throws Exception {
                    closer.eventuallyClose(closeable1, closingExecutor);
                    assertThat(peeker.getDone(input1)).isSameInstanceAs("value1");
                    try {
                      peeker.getDone(input2Failed);
                      fail("Peeker should fail for failed inputs");

            public U call(DeferredCloser closer, Peeker peeker) throws Exception {
              return function.apply(
                  closer,
                  peeker.getDone(future1),
                  peeker.getDone(future2),
                  peeker.getDone(future3),
                  peeker.getDone(future4),
                  peeker.getDone(future5));
            }

            @Override

): String? = headers[name] ?: defaultValue

@Throws(IOException::class)
fun Response.commonPeekBody(byteCount: Long): ResponseBody {
  val peeked = body.source().peek()
  val buffer = Buffer()
  peeked.request(byteCount)
  buffer.write(peeked, minOf(byteCount, peeked.buffer.size))
  return buffer.asResponseBody(body.contentType(), buffer.size)
}

fun Response.commonNewBuilder(): Response.Builder = Response.Builder(this)

   * a modest limit on `byteCount`, such as 1 MiB.
   */
  @Throws(IOException::class)
  fun peekBody(byteCount: Long): ResponseBody {
    val peeked = body.source().peek()
    val buffer = Buffer()
    peeked.request(byteCount)
    buffer.write(peeked, minOf(byteCount, peeked.buffer.size))
    return buffer.asResponseBody(body.contentType(), buffer.size)
  }

  @JvmName("-deprecated_body")
  @Deprecated(

    while (true) {
      if (peek == null) {
        peek = readToken()
        if (skipCommasAndWhitespace()) break // We peeked a scheme name followed by ','.
        eqCount = skipAll('='.code.toByte())
      }
      if (eqCount == 0) break // We peeked a scheme name.
      if (eqCount > 1) return // Unexpected '=' characters.
      if (skipCommasAndWhitespace()) return // Unexpected ','.