Module java.net.http
Package java.net.http

## Class WebSocketHandshakeException

- java.lang.Object
- - java.lang.Throwable
  - - java.lang.Exception
    - - java.io.IOException
      - - java.net.http.WebSocketHandshakeException

- All Implemented Interfaces:
    `Serializable`

      public final class WebSocketHandshakeException
      extends IOException

  Thrown when the opening handshake has failed.
  Since:
    11
  See Also:
    Serialized Form

- - ### Constructor Summary

    Constructors
    Constructor | Description
    --- | ---
    `WebSocketHandshakeException​(HttpResponse<?> response)` | Constructs a `WebSocketHandshakeException` with the given `HttpResponse`.

  - ### Method Summary

    All Methods Instance Methods Concrete Methods
    Modifier and Type | Method | Description
    --- | --- | ---
    `HttpResponse<?>` | `getResponse()` | Returns the server's counterpart of the opening handshake.

    - ### Methods declared in class java.lang.Throwable

      `addSuppressed, fillInStackTrace, getCause, getLocalizedMessage, getMessage, getStackTrace, getSuppressed, initCause, printStackTrace, printStackTrace, printStackTrace, setStackTrace, toString`

    - ### Methods declared in class java.lang.Object

      `clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait`

- - ### Constructor Detail

    - #### WebSocketHandshakeException

          public WebSocketHandshakeException​(HttpResponse<?> response)

      Constructs a `WebSocketHandshakeException` with the given `HttpResponse`.
      Parameters:
        `response` - the `HttpResponse` that resulted in the handshake failure

  - ### Method Detail

    - #### getResponse

          public HttpResponse<?> getResponse()

      Returns the server's counterpart of the opening handshake.

      The value may be unavailable (`null`) if this exception has been serialized and then deserialized.

      API Note:
        The primary purpose of this method is to allow programmatic examination of the reasons behind the failure of the opening handshake. Some of these reasons might allow recovery.
      Returns:
        server response