Sample code for the ConnectionRequest readHeaders method from Codename One

ReadHeadersSample.java

ConnectionRequest request = new ConnectionRequest(url, false) {
    protected void readHeaders(Object connection) throws IOException {
        String[] headerNames = getHeaderFieldNames(connection);
        for(String headerName : headerNames) {
            String headerValue = getHeader(headerName);
            //....
        }
    }
    protected void readResponse(InputStream input) {
        // just read from the response input stream
    }
};
NetworkManager.getInstance().addToQueue(request);

Sample usage of ConnectionRequest.

From the Codename One project