Question

I have the following code:

URL urlServlet = new URL(WEB_SERVER_URL);
URLConnection connection = urlServlet.openConnection();

connection.setDoInput(true);
connection.setDoOutput(true);
connection.setUseCaches(false);
connection.setDefaultUseCaches(true);
connection.setRequestProperty("Content-Type", "application/octet-stream");

connection.setRequestProperty("event", "blah");

OutputStream outputStream = servletConnection.getOutputStream();
outputStream.flush();
outputStream.close();

The server is not responding to this program.

But if I get inputStream from connection, I catch breakpoint in the DoGet servlet method.

What am I doing wrong?

Answer 1

But if I get inputStream from connection, I catch breakpoint in the DoGet servlet method.

What am I doing wrong?

Your mistake was to not asking for the response. The URLConnection is lazily executed. The request will only be sent whenever you ask for the response. Calling getInputStream() will actually fire the HTTP request because you’re asking for the response. The connection will not be made when you just open and close the request body.

See also:

• Using java.net.URLConnection to fire and handle HTTP requests