@Override
protected void doHead(HttpServletRequest req, HttpServletResponse resp)
throws IOException, ServletException {
try {
lookup(req).respondHead(resp);
} catch (UnsupportedOperationException e) {
super.doHead(req, resp);
}
}
@Override
protected void doHead(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
// Passes HEAD to GET by default
super.doHead(req, resp);
}
/**
* Receives standard HTTP requests from the public <code>service</code> method and dispatches them
* to the <code>do</code><i>Method</i> methods defined in this class. This method is an
* HTTP-specific version of the {@link javax.servlet.Servlet#service} method. There's no need to
* override this method.
*
* @param req the {@link HttpServletRequest} object that contains the request the client made of
* the servlet
* @param resp the {@link HttpServletResponse} object that contains the response the servlet
* returns to the client
* @exception IOException if an input or output error occurs while the servlet is handling the
* HTTP request
* @exception ServletException if the HTTP request cannot be handled
* @see javax.servlet.Servlet#service
*/
protected void service(HttpServletRequest req, HttpServletResponse resp)
throws ServletException, IOException {
String method = req.getMethod();
if (method.equals(METHOD_GET)) {
long lastModified = getLastModified(req);
if (lastModified == -1) {
// servlet doesn't support if-modified-since, no reason
// to go through further expensive logic
doGet(req, resp);
} else {
long ifModifiedSince;
try {
ifModifiedSince = req.getDateHeader(HEADER_IFMODSINCE);
} catch (IllegalArgumentException iae) {
// Invalid date header - proceed as if none was set
ifModifiedSince = -1;
}
if (ifModifiedSince < (lastModified / 1000 * 1000)) {
// If the servlet mod time is later, call doGet()
// Round down to the nearest second for a proper compare
// A ifModifiedSince of -1 will always be less
maybeSetLastModified(resp, lastModified);
doGet(req, resp);
} else {
resp.setStatus(HttpServletResponse.SC_NOT_MODIFIED);
}
}
} else if (method.equals(METHOD_HEAD)) {
long lastModified = getLastModified(req);
maybeSetLastModified(resp, lastModified);
doHead(req, resp);
} else if (method.equals(METHOD_POST)) {
doPost(req, resp);
} else if (method.equals(METHOD_PUT)) {
doPut(req, resp);
} else if (method.equals(METHOD_DELETE)) {
doDelete(req, resp);
} else if (method.equals(METHOD_OPTIONS)) {
doOptions(req, resp);
} else if (method.equals(METHOD_TRACE)) {
doTrace(req, resp);
} else {
//
// Note that this means NO servlet supports whatever
// method was requested, anywhere on this server.
//
String errMsg = lStrings.getString("http.method_not_implemented");
Object[] errArgs = new Object[1];
errArgs[0] = method;
errMsg = MessageFormat.format(errMsg, errArgs);
resp.sendError(HttpServletResponse.SC_NOT_IMPLEMENTED, errMsg);
}
}