Fixed the way render_endpoint overwrites request.endpoint and fixed parameters of course endpoint

server.py

 #!/bin/python
 from flask import Flask, g, request, url_for, redirect, session, render_template, flash
+from werkzeug.routing import Rule
 from functools import wraps
 from datetime import date, timedelta, datetime, time
 import os
@@ -52,8 +53,7 @@ def render_endpoint(endpoint, flashtext=None, **kargs):
 	if flashtext:
 		flash(flashtext)
 	# request.endpoint is used for navbar highlighting
-	if request.url_rule:
-		request.url_rule.endpoint = endpoint
+	request.url_rule = Rule(request.path, endpoint=endpoint)
 	return app.view_functions[endpoint](**kargs)
 
 @app.errorhandler(404)
@@ -87,8 +87,12 @@ def videos():
 	return render_template('course.html', courses=courses, groupedby=groupedby)
 
 @app.route('/course/<id>')
-def course(id):
-	courses = query('SELECT * FROM courses WHERE ((handle = ?) or id = ?) AND (? OR visible)', id, id, ismod())
+@app.route('/course/<int:numid>')
+def course(numid=None, id=None):
+	if numid:
+		courses = query('SELECT * FROM courses WHERE id = ? AND (? OR visible)', numid, ismod())
+	else:
+		courses = query('SELECT * FROM courses WHERE handle = ? AND (? OR visible)', id, ismod())
 	if not courses:
 		return render_endpoint('index', 'Diese Veranstaltung existiert nicht!'), 404
 	lectures = query('SELECT * FROM lectures WHERE course_id = ? AND (? OR visible)', courses[0]['id'], ismod())