We are working on a dubbo gateway and need to support mutual access between different network clusters. This should be a common scenario. This requires dubbo to do two things for us:

1. Dynamically modify the ip and change the access of the local cluster to remote. This extension can be done, although there are some bugs, https://dubbo.apache.org/zh/docs3-v2/java-sdk/advanced-features-and-usage/service/specify-ip/

2. Forward the dubbo request. When the gateway receives the access request from cluster A, it should forward it to cluster B (now it returns an exception).

  From the code execution process.
  current:
  gateway-dubbo-provider receives the request -> parses -> judges whether the request interface has a corresponding cache URL -> no -> throws IOException -> netty returns

  ```java
  void handleRequest(final ExchangeChannel channel, Request req) throws RemotingException {
          Response res = new Response(req.getId(), req.getVersion());
          if (req.isBroken()) {
              Object data = req.getData();
              String msg;
              if (data == null) {
                  msg = null;
              } else if (data instanceof Throwable) {
                  msg = StringUtils.toString((Throwable) data);
              } else {
                  msg = data.toString();
              }
              res.setErrorMessage("Fail to decode request due to: " + msg);
              res.setStatus(Response.BAD_REQUEST);

              channel.send(res);
              return;
          }
  }
  ```

  ​

  expect:
  gateway-dubbo-provider receives the request -> parses -> judges whether the request interface has a corresponding cache URL -> no -> obtains the exception handler through spi (the request can be forwarded here) -> netty returns

```java
  void handleRequest(final ExchangeChannel channel, Request req) throws RemotingException {
          Response res = new Response(req.getId(), req.getVersion());
          if (req.isBroken()) {
              Object data = req.getData();
           //expert begin
          List<ExceptionHandler> list = spiExtensions.listByType(ExceptionHandler); 
          list.forEach(handler.handle(path,version))
           //expert end
              String msg;
              if (data == null) {
                  msg = null;
              } else if (data instanceof Throwable) {
                  msg = StringUtils.toString((Throwable) data);
              } else {
                  msg = data.toString();
              }
              res.setErrorMessage("Fail to decode request due to: " + msg);
              res.setStatus(Response.BAD_REQUEST);

              channel.send(res);
              return;
          }
  }
```


Since dubbo.extension provides dynamic ip replacement, then we should consider whether the target ip can be accepted and processed. I think this exception handler is an extension function of the dubbo.extension package.
We can provide ExceptionHandler similar to springboot, which can be more flexible

if (!decodeDataInIoThread && decodeInUserThreadLogged.compareAndSet(false, true)) {
                log.info("Because thread pool isolation is enabled on the dubbo protocol, the body can only be decoded " +
                    "on the io thread, and the parameter[" + DECODE_IN_IO_THREAD_KEY + "] will be ignored");
                
                
            }
            return true;
        }
        return decodeDataInIoThread;
    }
    private byte[] readMessageData(InputStream is) throws IOException {
        if (is.available() > 0) {
            byte[] result = new byte[is.available()];
            is.read(result);
            return result;
        }
        return new byte[]{};
    }
    @Override
    protected void encodeRequestData(Channel channel, ObjectOutput out, Object data) throws IOException {
        encodeRequestData(channel, out, data, DUBBO_VERSION);
    }
    @Override
    protected void encodeResponseData(Channel channel, ObjectOutput out, Object data) throws IOException {
        encodeResponseData(channel, out, data, DUBBO_VERSION);
    }
    @Override
    protected void encodeRequestData(Channel channel, ObjectOutput out, Object data, String version) throws IOException {
        RpcInvocation inv = (RpcInvocation) data;
        out.writeUTF(version);