Java 类com.squareup.okhttp.Connection 实例源码

/**
 * @param requestHeaders the client's supplied request headers. This class
 *     creates a private copy that it can mutate.
 * @param connection the connection used for an intermediate response
 *     immediately prior to this request/response pair, such as a same-host
 *     redirect. This engine assumes ownership of the connection and must
 *     release it when it is unneeded.
 */
public HttpEngine(OkHttpClient client, Policy policy, String method, RawHeaders requestHeaders,
    Connection connection, RetryableOutputStream requestBodyOut) throws IOException {
  this.client = client;
  this.policy = policy;
  this.method = method;
  this.connection = connection;
  this.requestBodyOut = requestBodyOut;

  try {
    uri = Platform.get().toUriLenient(policy.getURL());
  } catch (URISyntaxException e) {
    throw new IOException(e.getMessage());
  }

  this.requestHeaders = new RequestHeaders(uri, new RawHeaders(requestHeaders));
}

/**
 * Discards the response body so that the connection can be reused. This
 * needs to be done judiciously, since it delays the current request in
 * order to speed up a potential future request that may never occur.
 *
 * <p>A stream may be discarded to encourage response caching (a response
 * cannot be cached unless it is consumed completely) or to enable connection
 * reuse.
 */
private static boolean discardStream(HttpEngine httpEngine, InputStream responseBodyIn) {
  Connection connection = httpEngine.connection;
  if (connection == null) return false;
  Socket socket = connection.getSocket();
  if (socket == null) return false;
  try {
    int socketTimeout = socket.getSoTimeout();
    socket.setSoTimeout(DISCARD_STREAM_TIMEOUT_MILLIS);
    try {
      Util.skipAll(responseBodyIn);
      return true;
    } finally {
      socket.setSoTimeout(socketTimeout);
    }
  } catch (IOException e) {
    return false;
  }
}

/**
 * @param requestHeaders the client's supplied request headers. This class
 *     creates a private copy that it can mutate.
 * @param connection the connection used for an intermediate response
 *     immediately prior to this request/response pair, such as a same-host
 *     redirect. This engine assumes ownership of the connection and must
 *     release it when it is unneeded.
 */
public HttpEngine(OkHttpClient client, Policy policy, String method, RawHeaders requestHeaders,
    Connection connection, RetryableOutputStream requestBodyOut) throws IOException {
  this.client = client;
  this.policy = policy;
  this.method = method;
  this.connection = connection;
  this.requestBodyOut = requestBodyOut;

  try {
    uri = Platform.get().toUriLenient(policy.getURL());
  } catch (URISyntaxException e) {
    throw new IOException(e.getMessage());
  }

  this.requestHeaders = new RequestHeaders(uri, new RawHeaders(requestHeaders));
}

/**
 * Discards the response body so that the connection can be reused. This
 * needs to be done judiciously, since it delays the current request in
 * order to speed up a potential future request that may never occur.
 *
 * <p>A stream may be discarded to encourage response caching (a response
 * cannot be cached unless it is consumed completely) or to enable connection
 * reuse.
 */
private static boolean discardStream(HttpEngine httpEngine, InputStream responseBodyIn) {
  Connection connection = httpEngine.connection;
  if (connection == null) return false;
  Socket socket = connection.getSocket();
  if (socket == null) return false;
  try {
    int socketTimeout = socket.getSoTimeout();
    socket.setSoTimeout(DISCARD_STREAM_TIMEOUT_MILLIS);
    try {
      Util.skipAll(responseBodyIn);
      return true;
    } finally {
      socket.setSoTimeout(socketTimeout);
    }
  } catch (IOException e) {
    return false;
  }
}

/**
 * @param requestHeaders the client's supplied request headers. This class
 *     creates a private copy that it can mutate.
 * @param connection the connection used for an intermediate response
 *     immediately prior to this request/response pair, such as a same-host
 *     redirect. This engine assumes ownership of the connection and must
 *     release it when it is unneeded.
 */
public HttpEngine(OkHttpClient client, Policy policy, String method, RawHeaders requestHeaders,
    Connection connection, RetryableOutputStream requestBodyOut) throws IOException {
  this.client = client;
  this.policy = policy;
  this.method = method;
  this.connection = connection;
  this.requestBodyOut = requestBodyOut;

  try {
    uri = Platform.get().toUriLenient(policy.getURL());
  } catch (URISyntaxException e) {
    throw new IOException(e.getMessage());
  }

  this.requestHeaders = new RequestHeaders(uri, new RawHeaders(requestHeaders));
}

/**
 * Discards the response body so that the connection can be reused. This
 * needs to be done judiciously, since it delays the current request in
 * order to speed up a potential future request that may never occur.
 *
 * <p>A stream may be discarded to encourage response caching (a response
 * cannot be cached unless it is consumed completely) or to enable connection
 * reuse.
 */
private static boolean discardStream(HttpEngine httpEngine, InputStream responseBodyIn) {
  Connection connection = httpEngine.connection;
  if (connection == null) return false;
  Socket socket = connection.getSocket();
  if (socket == null) return false;
  try {
    int socketTimeout = socket.getSoTimeout();
    socket.setSoTimeout(DISCARD_STREAM_TIMEOUT_MILLIS);
    try {
      Util.skipAll(responseBodyIn);
      return true;
    } finally {
      socket.setSoTimeout(socketTimeout);
    }
  } catch (IOException e) {
    return false;
  }
}

/**
 * @param requestHeaders the client's supplied request headers. This class
 *     creates a private copy that it can mutate.
 * @param connection the connection used for an intermediate response
 *     immediately prior to this request/response pair, such as a same-host
 *     redirect. This engine assumes ownership of the connection and must
 *     release it when it is unneeded.
 */
public HttpEngine(OkHttpClient client, Policy policy, String method, RawHeaders requestHeaders,
    Connection connection, RetryableOutputStream requestBodyOut) throws IOException {
  this.client = client;
  this.policy = policy;
  this.method = method;
  this.connection = connection;
  this.requestBodyOut = requestBodyOut;

  try {
    uri = Platform.get().toUriLenient(policy.getURL());
  } catch (URISyntaxException e) {
    throw new IOException(e.getMessage());
  }

  this.requestHeaders = new RequestHeaders(uri, new RawHeaders(requestHeaders));
}

/**
 * Discards the response body so that the connection can be reused. This
 * needs to be done judiciously, since it delays the current request in
 * order to speed up a potential future request that may never occur.
 *
 * <p>A stream may be discarded to encourage response caching (a response
 * cannot be cached unless it is consumed completely) or to enable connection
 * reuse.
 */
private static boolean discardStream(HttpEngine httpEngine, InputStream responseBodyIn) {
  Connection connection = httpEngine.connection;
  if (connection == null) return false;
  Socket socket = connection.getSocket();
  if (socket == null) return false;
  try {
    int socketTimeout = socket.getSoTimeout();
    socket.setSoTimeout(DISCARD_STREAM_TIMEOUT_MILLIS);
    try {
      Util.skipAll(responseBodyIn);
      return true;
    } finally {
      socket.setSoTimeout(socketTimeout);
    }
  } catch (IOException e) {
    return false;
  }
}

/**
 * @param requestHeaders the client's supplied request headers. This class
 *     creates a private copy that it can mutate.
 * @param connection the connection used for an intermediate response
 *     immediately prior to this request/response pair, such as a same-host
 *     redirect. This engine assumes ownership of the connection and must
 *     release it when it is unneeded.
 */
public HttpEngine(OkHttpClient client, Policy policy, String method, RawHeaders requestHeaders,
    Connection connection, RetryableOutputStream requestBodyOut) throws IOException {
  this.client = client;
  this.policy = policy;
  this.method = method;
  this.connection = connection;
  this.requestBodyOut = requestBodyOut;

  try {
    uri = Platform.get().toUriLenient(policy.getURL());
  } catch (URISyntaxException e) {
    throw new IOException(e.getMessage());
  }

  this.requestHeaders = new RequestHeaders(uri, new RawHeaders(requestHeaders));
}

/**
 * @param requestHeaders the client's supplied request headers. This class
 *     creates a private copy that it can mutate.
 * @param connection the connection used for an intermediate response
 *     immediately prior to this request/response pair, such as a same-host
 *     redirect. This engine assumes ownership of the connection and must
 *     release it when it is unneeded.
 */
public HttpEngine(OkHttpClient client, Policy policy, String method, RawHeaders requestHeaders,
    Connection connection, RetryableOutputStream requestBodyOut) throws IOException {
  this.client = client;
  this.policy = policy;
  this.method = method;
  this.connection = connection;
  this.requestBodyOut = requestBodyOut;

  try {
    uri = Platform.get().toUriLenient(policy.getURL());
  } catch (URISyntaxException e) {
    throw new IOException(e.getMessage());
  }

  this.requestHeaders = new RequestHeaders(uri, new RawHeaders(requestHeaders));
}

/**
 * Discards the response body so that the connection can be reused. This
 * needs to be done judiciously, since it delays the current request in
 * order to speed up a potential future request that may never occur.
 *
 * <p>A stream may be discarded to encourage response caching (a response
 * cannot be cached unless it is consumed completely) or to enable connection
 * reuse.
 */
private static boolean discardStream(HttpEngine httpEngine, InputStream responseBodyIn) {
  Connection connection = httpEngine.connection;
  if (connection == null) return false;
  Socket socket = connection.getSocket();
  if (socket == null) return false;
  try {
    int socketTimeout = socket.getSoTimeout();
    socket.setSoTimeout(DISCARD_STREAM_TIMEOUT_MILLIS);
    try {
      Util.skipAll(responseBodyIn);
      return true;
    } finally {
      socket.setSoTimeout(socketTimeout);
    }
  } catch (IOException e) {
    return false;
  }
}

public HttpEngine(OkHttpClient paramOkHttpClient, Request paramRequest, boolean paramBoolean1, boolean paramBoolean2, boolean paramBoolean3, Connection paramConnection, RouteSelector paramRouteSelector, RetryableSink paramRetryableSink, Response paramResponse)
{
  this.client = paramOkHttpClient;
  this.userRequest = paramRequest;
  this.bufferRequestBody = paramBoolean1;
  this.callerWritesRequestBody = paramBoolean2;
  this.forWebSocket = paramBoolean3;
  this.connection = paramConnection;
  this.routeSelector = paramRouteSelector;
  this.requestBodyOut = null;
  this.priorResponse = paramResponse;
  if (paramConnection != null)
  {
    Internal.instance.setOwner(paramConnection, this);
    this.route = paramConnection.route;
    return;
  }
  this.route = null;
}

/**
 * Discards the response body so that the connection can be reused. This
 * needs to be done judiciously, since it delays the current request in
 * order to speed up a potential future request that may never occur.
 *
 * <p>A stream may be discarded to encourage response caching (a response
 * cannot be cached unless it is consumed completely) or to enable connection
 * reuse.
 */
private static boolean discardStream(HttpEngine httpEngine, InputStream responseBodyIn) {
  Connection connection = httpEngine.connection;
  if (connection == null) return false;
  Socket socket = connection.getSocket();
  if (socket == null) return false;
  try {
    int socketTimeout = socket.getSoTimeout();
    socket.setSoTimeout(DISCARD_STREAM_TIMEOUT_MILLIS);
    try {
      Util.skipAll(responseBodyIn);
      return true;
    } finally {
      socket.setSoTimeout(socketTimeout);
    }
  } catch (IOException e) {
    return false;
  }
}

/**
 * @param requestHeaders the client's supplied request headers. This class
 *     creates a private copy that it can mutate.
 * @param connection the connection used for an intermediate response
 *     immediately prior to this request/response pair, such as a same-host
 *     redirect. This engine assumes ownership of the connection and must
 *     release it when it is unneeded.
 */
public HttpEngine(OkHttpClient client, Policy policy, String method, RawHeaders requestHeaders,
    Connection connection, RetryableOutputStream requestBodyOut) throws IOException {
  this.client = client;
  this.policy = policy;
  this.method = method;
  this.connection = connection;
  this.requestBodyOut = requestBodyOut;

  try {
    uri = Platform.get().toUriLenient(policy.getURL());
  } catch (URISyntaxException e) {
    throw new IOException(e.getMessage());
  }

  this.requestHeaders = new RequestHeaders(uri, new RawHeaders(requestHeaders));
}

/**
 * Discards the response body so that the connection can be reused. This
 * needs to be done judiciously, since it delays the current request in
 * order to speed up a potential future request that may never occur.
 *
 * <p>A stream may be discarded to encourage response caching (a response
 * cannot be cached unless it is consumed completely) or to enable connection
 * reuse.
 */
private static boolean discardStream(HttpEngine httpEngine, InputStream responseBodyIn) {
  Connection connection = httpEngine.connection;
  if (connection == null) return false;
  Socket socket = connection.getSocket();
  if (socket == null) return false;
  try {
    int socketTimeout = socket.getSoTimeout();
    socket.setSoTimeout(DISCARD_STREAM_TIMEOUT_MILLIS);
    try {
      Util.skipAll(responseBodyIn);
      return true;
    } finally {
      socket.setSoTimeout(socketTimeout);
    }
  } catch (IOException e) {
    return false;
  }
}

/**
 * Discards the response body so that the connection can be reused. This
 * needs to be done judiciously, since it delays the current request in
 * order to speed up a potential future request that may never occur.
 *
 * <p>A stream may be discarded to encourage response caching (a response
 * cannot be cached unless it is consumed completely) or to enable connection
 * reuse.
 */
private static boolean discardStream(HttpEngine httpEngine, InputStream responseBodyIn) {
  Connection connection = httpEngine.connection;
  if (connection == null) return false;
  Socket socket = connection.getSocket();
  if (socket == null) return false;
  try {
    int socketTimeout = socket.getSoTimeout();
    socket.setSoTimeout(DISCARD_STREAM_TIMEOUT_MILLIS);
    try {
      Util.skipAll(responseBodyIn);
      return true;
    } finally {
      socket.setSoTimeout(socketTimeout);
    }
  } catch (IOException e) {
    return false;
  }
}

/**
 * Discards the response body so that the connection can be reused. This
 * needs to be done judiciously, since it delays the current request in
 * order to speed up a potential future request that may never occur.
 *
 * <p>A stream may be discarded to encourage response caching (a response
 * cannot be cached unless it is consumed completely) or to enable connection
 * reuse.
 */
private static boolean discardStream(HttpEngine httpEngine, InputStream responseBodyIn) {
  Connection connection = httpEngine.connection;
  if (connection == null) return false;
  Socket socket = connection.getSocket();
  if (socket == null) return false;
  try {
    int socketTimeout = socket.getSoTimeout();
    socket.setSoTimeout(DISCARD_STREAM_TIMEOUT_MILLIS);
    try {
      Util.skipAll(responseBodyIn);
      return true;
    } finally {
      socket.setSoTimeout(socketTimeout);
    }
  } catch (IOException e) {
    return false;
  }
}

/**
 * Discards the response body so that the connection can be reused. This
 * needs to be done judiciously, since it delays the current request in
 * order to speed up a potential future request that may never occur.
 *
 * <p>A stream may be discarded to encourage response caching (a response
 * cannot be cached unless it is consumed completely) or to enable connection
 * reuse.
 */
private static boolean discardStream(HttpEngine httpEngine, InputStream responseBodyIn) {
  Connection connection = httpEngine.connection;
  if (connection == null) return false;
  Socket socket = connection.getSocket();
  if (socket == null) return false;
  try {
    int socketTimeout = socket.getSoTimeout();
    socket.setSoTimeout(DISCARD_STREAM_TIMEOUT_MILLIS);
    try {
      Util.skipAll(responseBodyIn);
      return true;
    } finally {
      socket.setSoTimeout(socketTimeout);
    }
  } catch (IOException e) {
    return false;
  }
}

/**
 * @param requestHeaders the client's supplied request headers. This class
 *     creates a private copy that it can mutate.
 * @param connection the connection used for an intermediate response
 *     immediately prior to this request/response pair, such as a same-host
 *     redirect. This engine assumes ownership of the connection and must
 *     release it when it is unneeded.
 */
public HttpEngine(OkHttpClient client, Policy policy, String method, RawHeaders requestHeaders,
    Connection connection, RetryableOutputStream requestBodyOut) throws IOException {
  this.client = client;
  this.policy = policy;
  this.method = method;
  this.connection = connection;
  this.requestBodyOut = requestBodyOut;

  try {
    uri = Platform.get().toUriLenient(policy.getURL());
  } catch (URISyntaxException e) {
    throw new IOException(e.getMessage());
  }

  this.requestHeaders = new RequestHeaders(uri, new RawHeaders(requestHeaders));
}

/**
 * Discards the response body so that the connection can be reused. This
 * needs to be done judiciously, since it delays the current request in
 * order to speed up a potential future request that may never occur.
 * <p/>
 * <p>A stream may be discarded to encourage response caching (a response
 * cannot be cached unless it is consumed completely) or to enable connection
 * reuse.
 */
private static boolean discardStream(HttpEngine httpEngine, InputStream responseBodyIn) {
    Connection connection = httpEngine.connection;
    if (connection == null)
        return false;
    Socket socket = connection.getSocket();
    if (socket == null)
        return false;
    try {
        int socketTimeout = socket.getSoTimeout();
        socket.setSoTimeout(DISCARD_STREAM_TIMEOUT_MILLIS);
        try {
            Util.skipAll(responseBodyIn);
            return true;
        } finally {
            socket.setSoTimeout(socketTimeout);
        }
    } catch (IOException e) {
        return false;
    }
}

/**
 * Discards the response body so that the connection can be reused. This
 * needs to be done judiciously, since it delays the current request in
 * order to speed up a potential future request that may never occur.
 *
 * <p>A stream may be discarded to encourage response caching (a response
 * cannot be cached unless it is consumed completely) or to enable connection
 * reuse.
 */
private static boolean discardStream(HttpEngine httpEngine, InputStream responseBodyIn) {
  Connection connection = httpEngine.connection;
  if (connection == null) return false;
  Socket socket = connection.getSocket();
  if (socket == null) return false;
  try {
    int socketTimeout = socket.getSoTimeout();
    socket.setSoTimeout(DISCARD_STREAM_TIMEOUT_MILLIS);
    try {
      Util.skipAll(responseBodyIn);
      return true;
    } finally {
      socket.setSoTimeout(socketTimeout);
    }
  } catch (IOException e) {
    return false;
  }
}

/**
 * @param requestHeaders the client's supplied request headers. This class
 *     creates a private copy that it can mutate.
 * @param connection the connection used for an intermediate response
 *     immediately prior to this request/response pair, such as a same-host
 *     redirect. This engine assumes ownership of the connection and must
 *     release it when it is unneeded.
 */
public HttpEngine(OkHttpClient client, Policy policy, String method, RawHeaders requestHeaders,
    Connection connection, RetryableOutputStream requestBodyOut) throws IOException {
  this.client = client;
  this.policy = policy;
  this.method = method;
  this.connection = connection;
  this.requestBodyOut = requestBodyOut;

  try {
    uri = Platform.get().toUriLenient(policy.getURL());
  } catch (URISyntaxException e) {
    throw new IOException(e.getMessage());
  }

  this.requestHeaders = new RequestHeaders(uri, new RawHeaders(requestHeaders));
}

/**
 * @param requestHeaders the client's supplied request headers. This class
 *     creates a private copy that it can mutate.
 * @param connection the connection used for an intermediate response
 *     immediately prior to this request/response pair, such as a same-host
 *     redirect. This engine assumes ownership of the connection and must
 *     release it when it is unneeded.
 */
public HttpEngine(OkHttpClient client, Policy policy, String method, RawHeaders requestHeaders,
    Connection connection, RetryableOutputStream requestBodyOut) throws IOException {
  this.client = client;
  this.policy = policy;
  this.method = method;
  this.connection = connection;
  this.requestBodyOut = requestBodyOut;

  try {
    uri = Platform.get().toUriLenient(policy.getURL());
  } catch (URISyntaxException e) {
    throw new IOException(e.getMessage());
  }

  this.requestHeaders = new RequestHeaders(uri, new RawHeaders(requestHeaders));
}

/**
 * @param requestHeaders the client's supplied request headers. This class
 *     creates a private copy that it can mutate.
 * @param connection the connection used for an intermediate response
 *     immediately prior to this request/response pair, such as a same-host
 *     redirect. This engine assumes ownership of the connection and must
 *     release it when it is unneeded.
 */
public HttpEngine(OkHttpClient client, Policy policy, String method, RawHeaders requestHeaders,
    Connection connection, RetryableOutputStream requestBodyOut) throws IOException {
  this.client = client;
  this.policy = policy;
  this.method = method;
  this.connection = connection;
  this.requestBodyOut = requestBodyOut;

  try {
    uri = Platform.get().toUriLenient(policy.getURL());
  } catch (URISyntaxException e) {
    throw new IOException(e.getMessage());
  }

  this.requestHeaders = new RequestHeaders(uri, new RawHeaders(requestHeaders));
}

/**
 * Discards the response body so that the connection can be reused. This
 * needs to be done judiciously, since it delays the current request in
 * order to speed up a potential future request that may never occur.
 *
 * <p>A stream may be discarded to encourage response caching (a response
 * cannot be cached unless it is consumed completely) or to enable connection
 * reuse.
 */
private static boolean discardStream(HttpEngine httpEngine, InputStream responseBodyIn) {
  Connection connection = httpEngine.connection;
  if (connection == null) return false;
  Socket socket = connection.getSocket();
  if (socket == null) return false;
  try {
    int socketTimeout = socket.getSoTimeout();
    socket.setSoTimeout(DISCARD_STREAM_TIMEOUT_MILLIS);
    try {
      Util.skipAll(responseBodyIn);
      return true;
    } finally {
      socket.setSoTimeout(socketTimeout);
    }
  } catch (IOException e) {
    return false;
  }
}

/**
 * Discards the response body so that the connection can be reused. This
 * needs to be done judiciously, since it delays the current request in
 * order to speed up a potential future request that may never occur.
 *
 * <p>A stream may be discarded to encourage response caching (a response
 * cannot be cached unless it is consumed completely) or to enable connection
 * reuse.
 */
private static boolean discardStream(HttpEngine httpEngine, InputStream responseBodyIn) {
  Connection connection = httpEngine.connection;
  if (connection == null) return false;
  Socket socket = connection.getSocket();
  if (socket == null) return false;
  try {
    int socketTimeout = socket.getSoTimeout();
    socket.setSoTimeout(DISCARD_STREAM_TIMEOUT_MILLIS);
    try {
      Util.skipAll(responseBodyIn);
      return true;
    } finally {
      socket.setSoTimeout(socketTimeout);
    }
  } catch (IOException e) {
    return false;
  }
}

/**
 * Discards the response body so that the connection can be reused. This
 * needs to be done judiciously, since it delays the current request in
 * order to speed up a potential future request that may never occur.
 *
 * <p>A stream may be discarded to encourage response caching (a response
 * cannot be cached unless it is consumed completely) or to enable connection
 * reuse.
 */
private static boolean discardStream(HttpEngine httpEngine, InputStream responseBodyIn) {
  Connection connection = httpEngine.connection;
  if (connection == null) return false;
  Socket socket = connection.getSocket();
  if (socket == null) return false;
  try {
    int socketTimeout = socket.getSoTimeout();
    socket.setSoTimeout(DISCARD_STREAM_TIMEOUT_MILLIS);
    try {
      Util.skipAll(responseBodyIn);
      return true;
    } finally {
      socket.setSoTimeout(socketTimeout);
    }
  } catch (IOException e) {
    return false;
  }
}

/**
 * Discards the response body so that the connection can be reused. This
 * needs to be done judiciously, since it delays the current request in
 * order to speed up a potential future request that may never occur.
 *
 * <p>A stream may be discarded to encourage response caching (a response
 * cannot be cached unless it is consumed completely) or to enable connection
 * reuse.
 */
private static boolean discardStream(HttpEngine httpEngine, InputStream responseBodyIn) {
  Connection connection = httpEngine.connection;
  if (connection == null) return false;
  Socket socket = connection.getSocket();
  if (socket == null) return false;
  try {
    int socketTimeout = socket.getSoTimeout();
    socket.setSoTimeout(DISCARD_STREAM_TIMEOUT_MILLIS);
    try {
      Util.skipAll(responseBodyIn);
      return true;
    } finally {
      socket.setSoTimeout(socketTimeout);
    }
  } catch (IOException e) {
    return false;
  }
}

/**
 * Discards the response body so that the connection can be reused. This
 * needs to be done judiciously, since it delays the current request in
 * order to speed up a potential future request that may never occur.
 *
 * <p>A stream may be discarded to encourage response caching (a response
 * cannot be cached unless it is consumed completely) or to enable connection
 * reuse.
 */
private static boolean discardStream(HttpEngine httpEngine, InputStream responseBodyIn) {
  Connection connection = httpEngine.connection;
  if (connection == null) return false;
  Socket socket = connection.getSocket();
  if (socket == null) return false;
  try {
    int socketTimeout = socket.getSoTimeout();
    socket.setSoTimeout(DISCARD_STREAM_TIMEOUT_MILLIS);
    try {
      Util.skipAll(responseBodyIn);
      return true;
    } finally {
      socket.setSoTimeout(socketTimeout);
    }
  } catch (IOException e) {
    return false;
  }
}

/**
 * Discards the response body so that the connection can be reused. This
 * needs to be done judiciously, since it delays the current request in
 * order to speed up a potential future request that may never occur.
 *
 * <p>A stream may be discarded to encourage response caching (a response
 * cannot be cached unless it is consumed completely) or to enable connection
 * reuse.
 */
private static boolean discardStream(HttpEngine httpEngine, InputStream responseBodyIn) {
  Connection connection = httpEngine.connection;
  if (connection == null) return false;
  Socket socket = connection.getSocket();
  if (socket == null) return false;
  try {
    int socketTimeout = socket.getSoTimeout();
    socket.setSoTimeout(DISCARD_STREAM_TIMEOUT_MILLIS);
    try {
      Util.skipAll(responseBodyIn);
      return true;
    } finally {
      socket.setSoTimeout(socketTimeout);
    }
  } catch (IOException e) {
    return false;
  }
}

/**
 * @param requestHeaders the client's supplied request headers. This class
 *     creates a private copy that it can mutate.
 * @param connection the connection used for an intermediate response
 *     immediately prior to this request/response pair, such as a same-host
 *     redirect. This engine assumes ownership of the connection and must
 *     release it when it is unneeded.
 */
public HttpEngine(OkHttpClient client, Policy policy, String method, RawHeaders requestHeaders,
    Connection connection, RetryableOutputStream requestBodyOut) throws IOException {
  this.client = client;
  this.policy = policy;
  this.method = method;
  this.connection = connection;
  this.requestBodyOut = requestBodyOut;

  try {
    uri = Platform.get().toUriLenient(policy.getURL());
  } catch (URISyntaxException e) {
    throw new IOException(e.getMessage());
  }

  this.requestHeaders = new RequestHeaders(uri, new RawHeaders(requestHeaders));
}

private HttpEngine newHttpEngine(String method, RawHeaders requestHeaders,
    Connection connection, RetryableOutputStream requestBody) throws IOException {
  if (url.getProtocol().equals("http")) {
    return new HttpEngine(client, this, method, requestHeaders, connection, requestBody);
  } else if (url.getProtocol().equals("https")) {
    return new HttpsEngine(client, this, method, requestHeaders, connection, requestBody);
  } else {
    throw new AssertionError();
  }
}

/**
 * Returns the next route address to attempt.
 *
 * @throws NoSuchElementException if there are no more routes to attempt.
 */
public Connection next(String method) throws IOException {
  // Always prefer pooled connections over new connections.
  for (Connection pooled; (pooled = pool.get(address)) != null; ) {
    if (method.equals("GET") || pooled.isReadable()) return pooled;
    pooled.close();
  }

  // Compute the next route to attempt.
  if (!hasNextTlsMode()) {
    if (!hasNextInetSocketAddress()) {
      if (!hasNextProxy()) {
        if (!hasNextPostponed()) {
          throw new NoSuchElementException();
        }
        return new Connection(nextPostponed());
      }
      lastProxy = nextProxy();
      resetNextInetSocketAddress(lastProxy);
    }
    lastInetSocketAddress = nextInetSocketAddress();
    resetNextTlsMode();
  }

  boolean modernTls = nextTlsMode() == TLS_MODE_MODERN;
  Route route = new Route(address, lastProxy, lastInetSocketAddress, modernTls);
  if (routeDatabase.shouldPostpone(route)) {
    postponedRoutes.add(route);
    // We will only recurse in order to skip previously failed routes. They will be
    // tried last.
    return next(method);
  }

  return new Connection(route);
}

/**
 * Clients should invoke this method when they encounter a connectivity
 * failure on a connection returned by this route selector.
 */
public void connectFailed(Connection connection, IOException failure) {
  Route failedRoute = connection.getRoute();
  if (failedRoute.getProxy().type() != Proxy.Type.DIRECT && proxySelector != null) {
    // Tell the proxy selector when we fail to connect on a fresh connection.
    proxySelector.connectFailed(uri, failedRoute.getProxy().address(), failure);
  }

  routeDatabase.failed(failedRoute, failure);
}

private HttpEngine newHttpEngine(String method, RawHeaders requestHeaders,
    Connection connection, RetryableOutputStream requestBody) throws IOException {
  if (url.getProtocol().equals("http")) {
    return new HttpEngine(client, this, method, requestHeaders, connection, requestBody);
  } else if (url.getProtocol().equals("https")) {
    return new HttpsEngine(client, this, method, requestHeaders, connection, requestBody);
  } else {
    throw new AssertionError();
  }
}

/**
 * Returns the next route address to attempt.
 *
 * @throws NoSuchElementException if there are no more routes to attempt.
 */
public Connection next(String method) throws IOException {
  // Always prefer pooled connections over new connections.
  for (Connection pooled; (pooled = pool.get(address)) != null; ) {
    if (method.equals("GET") || pooled.isReadable()) return pooled;
    pooled.close();
  }

  // Compute the next route to attempt.
  if (!hasNextTlsMode()) {
    if (!hasNextInetSocketAddress()) {
      if (!hasNextProxy()) {
        if (!hasNextPostponed()) {
          throw new NoSuchElementException();
        }
        return new Connection(nextPostponed());
      }
      lastProxy = nextProxy();
      resetNextInetSocketAddress(lastProxy);
    }
    lastInetSocketAddress = nextInetSocketAddress();
    resetNextTlsMode();
  }

  boolean modernTls = nextTlsMode() == TLS_MODE_MODERN;
  Route route = new Route(address, lastProxy, lastInetSocketAddress, modernTls);
  if (routeDatabase.shouldPostpone(route)) {
    postponedRoutes.add(route);
    // We will only recurse in order to skip previously failed routes. They will be
    // tried last.
    return next(method);
  }

  return new Connection(route);
}

/**
 * Clients should invoke this method when they encounter a connectivity
 * failure on a connection returned by this route selector.
 */
public void connectFailed(Connection connection, IOException failure) {
  Route failedRoute = connection.getRoute();
  if (failedRoute.getProxy().type() != Proxy.Type.DIRECT && proxySelector != null) {
    // Tell the proxy selector when we fail to connect on a fresh connection.
    proxySelector.connectFailed(uri, failedRoute.getProxy().address(), failure);
  }

  routeDatabase.failed(failedRoute, failure);
}

private HttpEngine newHttpEngine(String method, RawHeaders requestHeaders,
    Connection connection, RetryableOutputStream requestBody) throws IOException {
  if (url.getProtocol().equals("http")) {
    return new HttpEngine(client, this, method, requestHeaders, connection, requestBody);
  } else if (url.getProtocol().equals("https")) {
    return new HttpsEngine(client, this, method, requestHeaders, connection, requestBody);
  } else {
    throw new AssertionError();
  }
}

/**
 * Returns the next route address to attempt.
 *
 * @throws NoSuchElementException if there are no more routes to attempt.
 */
public Connection next(String method) throws IOException {
  // Always prefer pooled connections over new connections.
  for (Connection pooled; (pooled = pool.get(address)) != null; ) {
    if (method.equals("GET") || pooled.isReadable()) return pooled;
    pooled.close();
  }

  // Compute the next route to attempt.
  if (!hasNextTlsMode()) {
    if (!hasNextInetSocketAddress()) {
      if (!hasNextProxy()) {
        if (!hasNextPostponed()) {
          throw new NoSuchElementException();
        }
        return new Connection(nextPostponed());
      }
      lastProxy = nextProxy();
      resetNextInetSocketAddress(lastProxy);
    }
    lastInetSocketAddress = nextInetSocketAddress();
    resetNextTlsMode();
  }

  boolean modernTls = nextTlsMode() == TLS_MODE_MODERN;
  Route route = new Route(address, lastProxy, lastInetSocketAddress, modernTls);
  if (routeDatabase.shouldPostpone(route)) {
    postponedRoutes.add(route);
    // We will only recurse in order to skip previously failed routes. They will be
    // tried last.
    return next(method);
  }

  return new Connection(route);
}

/**
 * Clients should invoke this method when they encounter a connectivity
 * failure on a connection returned by this route selector.
 */
public void connectFailed(Connection connection, IOException failure) {
  Route failedRoute = connection.getRoute();
  if (failedRoute.getProxy().type() != Proxy.Type.DIRECT && proxySelector != null) {
    // Tell the proxy selector when we fail to connect on a fresh connection.
    proxySelector.connectFailed(uri, failedRoute.getProxy().address(), failure);
  }

  routeDatabase.failed(failedRoute, failure);
}