fun delayBeforeTrailersHttp1() {
    delayBeforeTrailers(Protocol.HTTP_1_1)
  }

  @Test
  fun delayBeforeTrailersHttp2() {
    trailers(Protocol.HTTP_2)
  }

  /** Confirm the client will block if necessary to consume trailers. */
  private fun delayBeforeTrailers(protocol: Protocol) {
    enableProtocol(protocol)

    server.enqueue(
      MockResponse
        .Builder()
        .trailers(headersOf("t1", "v2"))

        public String toString() {
            return "Options [sessionId=" + sessionId + ", name=" + name + ", propertiesPath=" + propertiesPath + "]";
        }
    }

    /**
     * Initializes the necessary probes for monitoring system resources.
     */
    static void initializeProbes() {
        // Force probes to be loaded
        ProcessProbe.getInstance();
        OsProbe.getInstance();

    } finally {
      user.removePlanToCancel(this)
      if (!success) {
        javaNetSocket?.closeQuietly()
        rawSocket.closeQuietly()
      }
    }
  }

  /** Does all the work necessary to build a full HTTP or HTTPS connection on a raw socket. */
  @Throws(IOException::class)
  private fun connectSocket() {
    val rawSocket =
      when (route.proxy.type()) {

   * Predicates.notNull())}. For varargs, use {@code Iterables.find(Arrays.asList(a, b, c, ...),
   * Predicates.notNull())}, static importing as necessary.
   *
   * <p><b>Note:</b> if {@code first} is represented as an {@link Optional}, this can be
   * accomplished with {@link Optional#or(Object) first.or(second)}. That approach also allows for

### Holding multiple locks

You're allowed to take the Http2Connection lock while holding the Http2Writer lock. But not vice-versa. Because taking the Http2Writer lock can block.

This is necessary for bookkeeping when creating new streams. Correct framing requires that stream IDs are sequential on the socket, so we need to bundle assigning the ID with sending the `SYN_STREAM` frame.

## Connection Pool

 * is returned by upstream, or after the upstream source has been exhausted.
 *
 * As bytes are returned from upstream they are written to a local file. Downstream sources read
 * from this file as necessary.
 *
 * This class also keeps a small buffer of bytes recently read from upstream. This is intended to
 * save a small amount of file I/O and data copying.
 */
class Relay private constructor(
  /**

    verifyTableSize(100, 2, 4);
    verifyTableSize(100, 5, 8);
    verifyTableSize(100, 33, 64);
    verifyTableSize(60, 60, 128);
    verifyTableSize(120, 60, 256);
    // if the table is only double the necessary size, we don't bother resizing it
    verifyTableSize(180, 60, 128);
    // but if it's even bigger than double, we rebuild the table
    verifyTableSize(17, 17, 32);
    verifyTableSize(17, 16, 32);

   * explicit {@code @NullableDecl} annotation (see <a
   * href="https://github.com/google/guava/issues/1819">#1819</a>).
   *
   * <p>It is not necessary to consider visibility, return type, or type parameter declarations. The
   * declaration of a method with the same name and formal parameters as {@link Object#equals} that

        // buildOrThrow(). We would want an exception to include two values for the duplicate key.
        if (entries == entryArray) {
          // Temporary variable is necessary to defeat bad smartcast (entries adopting the type of
          // entryArray) in the Kotlin translation.
          Entry<K, V>[] originalEntries = entries;
          entries = originalEntries.clone();
        }
      }

  Lockable {
  private var http2Connection: Http2Connection? = null

  // These properties are guarded by `this`.

  /**
   * If true, no new exchanges can be created on this connection. It is necessary to set this to
   * true when removing a connection from the pool; otherwise a racing caller might get it from the
   * pool when it shouldn't. Symmetrically, this must always be checked before returning a