See detail log in HttpURLConnection

Question

I write following code:

public static void main(String args[]) throws IOException {
    URL url = new URL("http://stackoverflow.com/");
    HttpURLConnection conn = (HttpURLConnection) url.openConnection();
    System.out.print(conn.getResponseMessage());
}

1. I want show all debug information in console when i run this method.
2. I want see what kind of http request have been sent from log.

Answer 1

Since Java uses by default Java Logging, add the following code:

static {
    ConsoleHandler handler = new ConsoleHandler();
    handler.setLevel(Level.ALL);
    Logger log = LogManager.getLogManager().getLogger("");
    log.addHandler(handler);
    log.setLevel(Level.ALL);
}

Answer 2

//2. simple header informations:

conn.getHeaderFields().toString(); //response headers
conn.getResponseCode();//response http code
conn.getRequestProperties().toString();//request headers