Dfyjkt

I am receiving a post request from my vendor who expects an instant response (I am using Spring Rest). I use this request to validate some transactions and allow file download to the user on the browser. My question is how can i simultaneously render that file to the browser for download and return the expected response to my vendor. Here is my attempted solution (unsuccessful). Please help. With thanks.

@RequestMapping(method = RequestMethod.GET,RequestMethod.POST, value ="/listeningurl", consumes = "application/xml", produces = "application/xml") 
 public ResponseObject lodgementNotifications(@RequestBody RequesObject reqObject, HttpServletResponse response)
 

 //do stuffs with reqObject;
 //Generate a fileUrl using some parameters from the reqObject;


 try 
 //copies all bytes from a file to an output stream

 URL fileURL = new URL(fileUrl); 
 HttpURLConnection httpConn = (HttpURLConnection) fileURL.openConnection(); 


 InputStream inputStream = httpConn.getInputStream();

 // set content type 
 response.setContentType(fileMetaData.getContentType());
 // add response header
 response.addHeader("Content-Disposition", "attachment; filename=" fileName"));
 response.setContentLengthLong(fileMetaData.getContentLength());
 response.setStatus(200); 

 FileCopyUtils.copy(inputStream, response.getOutputStream());
 //flushes output stream
 response.getOutputStream().flush();
 catch (IOException e) 
 System.out.println("Error :- " + e.getMessage());

 


 // Initialize ResponseObject
 return responseObject