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🌐 Web query:

Jetty 12 Server setHandler replace behavior multiple calls

💡 Result:

Short answer: calling Server.setHandler(...) replaces the server's single top-level handler — only the last handler you set is active. Server is a Handler.Wrapper/Singleton (one child), so multiple independent handlers must be composed (e.g. Handler.Sequence / Handler.Collection, ContextHandlerCollection, or wrap handlers with a wrapper like GzipHandler/GracefulHandler and set its child). Use add/setHandlers on a Handler.Collection (or build a tree via wrapper.setHandler(child)). [1][2][3]

Sources:

• Jetty programming guide (handler tree / ContextHandlerCollection examples). [1]
• Jetty Server javadoc (Server extends Handler.Wrapper / single-child semantics). [2]
• Handler.Collection API (use addHandler/replaceHandler/setHandlers for multiple children). [3]

🌐 Web query:

Jetty 12 ConnectHandler ProxyHandler.Forward composition wrap handler

💡 Result:

Yes — in Jetty 12 you compose ConnectHandler and ProxyHandler.Forward by wrapping the Forward proxy with a ConnectHandler (so CONNECT tunnels are handled) and setting that as the Server handler (or placing under a SecurityHandler if you need auth). Example:

• Handler tree for both plain HTTP and HTTPS (CONNECT): Server -> ConnectHandler -> ProxyHandler.Forward. See Jetty docs. [1]

Minimal Java example:

Server server = new Server();
server.addConnector(new ServerConnector(server));
// forward proxy (override as needed)
ProxyHandler.Forward forward = new ProxyHandler.Forward() {
    `@Override`
    public boolean handle(Request clientToProxyRequest, Response proxyToClientResponse, Callback proxyToClientCallback) {
        String host = Request.getServerName(clientToProxyRequest);
        if (host.endsWith(".blocked")) {
            Response.writeError(clientToProxyRequest, proxyToClientResponse, proxyToClientCallback, HttpStatus.FORBIDDEN_403);
            return true;
        }
        return super.handle(clientToProxyRequest, proxyToClientResponse, proxyToClientCallback);
    }
};
// ConnectHandler wraps the forward proxy to support CONNECT/TLS tunnelling
ConnectHandler connect = new ConnectHandler(forward);
// Optionally configure connect white/black lists: connect.setWhiteList(...); connect.setBlackList(...);
server.setHandler(connect);
server.start();

Notes:

• If you only need plain HTTP (no CONNECT/tunnelling), you can set ProxyHandler.Forward directly as the Server handler. If you need both HTTP and HTTPS tunnelling, wrap the Forward with ConnectHandler as above. [1][2]
• Override newHttpClient()/configureHttpClient() on the Forward if you need custom HttpClient transport (HTTP/2, TLS, etc.). [1][3]

References:

• Jetty 12 Programming Guide — ConnectHandler and ProxyHandler usage. [1]
• ProxyHandler.Forward Javadoc. [2]

(If you want a complete copy-paste example with imports and HttpClient customisation, tell me and I’ll paste it.)

🌐 Web query:

Jetty 12 HTTPS CONNECT tunneling HTTP forwarding proxy setup

💡 Result:

Summary and quick setup (Jetty 12)

• Jetty handles HTTPS tunneling (HTTP CONNECT) with ConnectHandler and plain HTTP forward proxying with ProxyHandler.Forward. ConnectHandler establishes TCP tunnels for CONNECT requests; ProxyHandler.Forward handles normal forwarded HTTP requests. [1]

• If you run Jetty as a standalone distribution you can compose these handlers (and add SecurityHandler for proxy auth). Typical handler tree:
  Server
  └─ SecurityHandler (optional)
  └─ ConnectHandler
  └─ ProxyHandler.Forward
  This allows CONNECT tunnels plus regular forward-proxy behavior and optional auth/whitelisting. [1]

• HttpClient (Jetty’s client library) supports configuring a forward proxy (including CONNECT behavior for HTTPS). Use org.eclipse.jetty.client.HttpClient when programmatically configuring clients. [2]

Minimal Java example (server-side handler wiring)

• Create a Server, instantiate ConnectHandler, instantiate ProxyHandler.Forward, set ProxyHandler.Forward as child of ConnectHandler, optionally wrap in a SecurityHandler (or override ConnectionHandler.handleAuthentication(...) for CONNECT auth), add to Server and start.

Example sketch:
Server server = new Server();
ConnectHandler connect = new ConnectHandler();
ProxyHandler.Forward forward = new ProxyHandler.Forward();
connect.setHandler(forward);
// optional: configure connect.setWhiteList(...)/setBlackList(...), add auth
server.setHandler(connect);
server.start();

(See Jetty docs for exact API names and configuration details.) [1][2]

Notes and pointers

• Use connect.setWhiteList(...) / setBlackList(...) to restrict allowed CONNECT targets; implement authentication via SecurityHandler or override ConnectionHandler.handleAuthentication(...). [1]
• If running behind TLS-terminating proxies or load balancers, consult Jetty’s docs about PROXY protocol / Forwarded headers and required modules. [3]

References
[1] Jetty 12 Server / ConnectHandler and ProxyHandler.Forward documentation.
[2] Jetty 12 HttpClient (forward proxy support).
[3] Jetty 12 operations guide — proxy/protocols (PROXY protocol, Forwarded header).

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.