JSR-356: How to abort a websocket connection during the handshake?

Question

I need to be able to abort a websocket connection during the handshake in case the HTTP request does not meet certain criteria. From what I understand, the proper place to d

Answer 1

The easiest way is to setup simple web-filter in your web.xml which will be executed before handshake.

Smth like:

public class MyHandshakeFilter implements Filter {

@Override
public void init(FilterConfig config) throws ServletException {
    // do nothing
}

/**
 * Passes request to chain when request port is equal to specified in the allowedPort property
 * and returns HttpServletResponse.SC_NOT_FOUND in other case.
 */
@Override
public void doFilter(ServletRequest request, ServletResponse response, FilterChain chain) throws IOException,
        ServletException {

    if () {
        // request conditions are met. continue handshake...
        chain.doFilter(request, response);
    } else {
        // request conditions are NOT met. reject handshake...
        ((HttpServletResponse) response).setStatus(HttpServletResponse.SC_FORBIDDEN);
    }
}
}

and in web.xml:

    yourHandshakeFilter
    com....MyHandshakeFilter


    yourHandshakeFilter
    /yourEndpointUrl

and your ServerEndpoint should be smth like:

@ServerEndpoint("/yourEndpointUrl")
public class MyServerEndpoint {
...
}