/**
* Handles the HTTP request by generating a Message and sending it to the request channel. If this
* gateway's 'expectReply' property is true, it will also generate a response from the reply
* Message once received. That response will be written by the {@link HttpMessageConverter}s.
*/
public final void handleRequest(
HttpServletRequest servletRequest, HttpServletResponse servletResponse)
throws ServletException, IOException {
Object responseContent = null;
Message<?> responseMessage;
final ServletServerHttpRequest request = new ServletServerHttpRequest(servletRequest);
final ServletServerHttpResponse response = new ServletServerHttpResponse(servletResponse);
try {
responseMessage = super.doHandleRequest(servletRequest, servletResponse);
if (responseMessage != null) {
responseContent = setupResponseAndConvertReply(response, responseMessage);
}
} catch (Exception e) {
responseContent = handleExceptionInternal(e);
}
if (responseContent != null) {
if (responseContent instanceof HttpStatus) {
response.setStatusCode((HttpStatus) responseContent);
} else {
this.writeResponse(responseContent, response, request.getHeaders().getAccept());
}
}
}
public void handleReturnValue(
Object returnValue,
MethodParameter returnType,
ModelAndViewContainer mavContainer,
NativeWebRequest webRequest)
throws Exception {
mavContainer.setRequestHandled(true);
if (returnValue == null) {
return;
}
ServletServerHttpRequest inputMessage = createInputMessage(webRequest);
ServletServerHttpResponse outputMessage = createOutputMessage(webRequest);
Assert.isInstanceOf(HttpEntity.class, returnValue);
HttpEntity<?> responseEntity = (HttpEntity<?>) returnValue;
if (responseEntity instanceof ResponseEntity) {
outputMessage.setStatusCode(((ResponseEntity<?>) responseEntity).getStatusCode());
}
HttpHeaders entityHeaders = responseEntity.getHeaders();
if (!entityHeaders.isEmpty()) {
outputMessage.getHeaders().putAll(entityHeaders);
}
Object body = responseEntity.getBody();
if (body != null) {
writeWithMessageConverters(body, returnType, inputMessage, outputMessage);
} else {
// flush headers to the HttpServletResponse
outputMessage.getBody();
}
}