diff -r 1574965c7dc7 -r 57cfb94ab99f src/main/java/de/uapcore/lightpit/AbstractLightPITServlet.java
--- a/src/main/java/de/uapcore/lightpit/AbstractLightPITServlet.java	Wed May 13 21:46:26 2020 +0200
+++ b/src/main/java/de/uapcore/lightpit/AbstractLightPITServlet.java	Thu May 14 22:48:01 2020 +0200
@@ -39,6 +39,7 @@
 import javax.servlet.http.HttpServletResponse;
 import javax.servlet.http.HttpSession;
 import java.io.IOException;
+import java.lang.reflect.Constructor;
 import java.lang.reflect.Method;
 import java.lang.reflect.Modifier;
 import java.sql.Connection;
@@ -225,6 +226,18 @@
     }
 
     /**
+     * @param req      the servlet request object
+     * @param location the location where to redirect
+     * @see Constants#REQ_ATTR_REDIRECT_LOCATION
+     */
+    public void setRedirectLocation(HttpServletRequest req, String location) {
+        if (location.startsWith("./")) {
+            location = location.replaceFirst("\\./", Functions.baseHref(req));
+        }
+        req.setAttribute(Constants.REQ_ATTR_REDIRECT_LOCATION, location);
+    }
+
+    /**
      * Specifies the name of an additional stylesheet used by the module.
      * <p>
      * Setting an additional stylesheet is optional, but quite common for HTML
@@ -240,6 +253,30 @@
         req.setAttribute(Constants.REQ_ATTR_STYLESHEET, Functions.enforceExt(stylesheet, ".css"));
     }
 
+    /**
+     * Obtains a request parameter of the specified type.
+     * The specified type must have a single-argument constructor accepting a string to perform conversion.
+     * The constructor of the specified type may throw an exception on conversion failures.
+     *
+     * @param req the servlet request object
+     * @param clazz the class object of the expected type
+     * @param name the name of the parameter
+     * @param <T> the expected type
+     * @return the parameter value or an empty optional, if no parameter with the specified name was found
+     */
+    public<T> Optional<T> getParameter(HttpServletRequest req, Class<T> clazz, String name) {
+        final String paramValue = req.getParameter(name);
+        if (paramValue == null) return Optional.empty();
+        if (clazz.equals(String.class)) return Optional.of((T)paramValue);
+        try {
+            final Constructor<T> ctor = clazz.getConstructor(String.class);
+            return Optional.of(ctor.newInstance(paramValue));
+        } catch (ReflectiveOperationException e) {
+            throw new RuntimeException(e);
+        }
+
+    }
+
     private void forwardToFullView(HttpServletRequest req, HttpServletResponse resp)
             throws IOException, ServletException {
 
@@ -287,6 +324,7 @@
         }
 
         // set some internal request attributes
+        req.setAttribute(Constants.REQ_ATTR_BASE_HREF, Functions.baseHref(req));
         req.setAttribute(Constants.REQ_ATTR_PATH, Functions.fullPath(req));
         Optional.ofNullable(moduleInfo).ifPresent((proxy) -> req.setAttribute(Constants.REQ_ATTR_MODULE_INFO, proxy));