How to make HttpURLConnection get header from servlet response?

Question

Servlet code:

if (errorMessage!=null) {
   response.setHeader("errorMessage",errorMessage);
   response.setStatus(200);
 } else {
   response.setStatus(500);
 }

Client Code:

HttpURLConnection httpCon = (HttpURLConnection) url.openConnection();
if (httpCon.getResponseCode==200 && httpCon.getHeaderField("errorMessage")!=null) {
   out.println("Error: "+ httpCon.getHeaderField("errorMessage"));
 } else {
     out.println("Error 500");
 }

The problem is that

httpCon.getHeaderField("errorMessage")

is always coming as null though errorMessage is not always null.

What am I doing wrong?

Answer 1

You should be using getResponseMessage() .

But 200 means no error. It means OK. Why are you expecting an error message?