Question

I have some issue with the code below, req.getHeader() is returning NULL

// The code below returns the expected value
String header = req.getHeader("x-key");
String size = req.getHeader("x-size");
String contentType = req.getContentType();

logger.info("Content-Length: " + req.getContentLength());
logger.info("x-key : " + header);
logger.info("x-size : " + size);

// The value of req.getHeader below is returning NULL
for (Enumeration e = req.getHeaderNames(); e.hasMoreElements();) {
   String headerName = (String) e.nextElement();
   logger.info("Name = " + headerName + " " + "Value = " + req.getHeader(headerName ));
}

What could be the problem?

Answer 1

Your code looks OK. If getHeader() returns null the header is indeed null, i.e. was not sent by client.

So, first check your client and be sure it sends the header. Second, try to use network sniffer, e.g. Wireshark and record the network activity.

If you need more assistance please post your client’s code.