### Is there an existing issue for this?

- [X] I have searched the existing issues and read the documentation

### Question

Using a websocket apigatewayv2 in localstack and i need to change the body of the request e.g. add the connectionid, which is something i can do with a HTTP integration on the AWS gateway, however when I try this with localstack i receive the following error "Unsupported integration type "HTTP" for Websocket API ID" and then prints the ID of the API, if this feature is not enabled then how should we test the actual API where the connectionId and other things are added to the request body

### Anything else?

_No response_
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                    for instream, outstream in streams:
                        if not instream:
                            continue
                        for line in iter(instream.readline, None):
                            
                            
                            if line in [None, "", b""]:
                                break
                            if not (line and line.strip()) and self.is_killed():
                                break
                            line = convert_line(line)
                            if filter_line(line):
                                continue
                            if self.log_listener:
                                self.log_listener(line, stream=instream)
                            if self.outfile not in [None, os.devnull]:
                                outstream.write(line)
                                outstream.flush()
                if self.process:
                    self.process.wait()
            else:
                self.process.communicate()
        except Exception as e:
            self.result_future.set_exception(e)
            if self.process and not self.quiet:
                LOG.warning('Shell command error "%s": %s', e, self.cmd)
        if self.process and not self.quiet and self.process.returncode != 0:
            LOG.warning('Shell command exit code "%s": %s', self.process.returncode, self.cmd)
    def is_killed(self):