self.conn.request('GET', '/day?date=3000-01-01')
         self.assertEqual(self.conn.getresponse().status, 200)
         self.conn.request('GET', '/day?date=FOO')
-        self.assertEqual(self.conn.getresponse().status, 401)
+        self.assertEqual(self.conn.getresponse().status, 400)
         self.conn.request('GET', '/calendar')
         self.assertEqual(self.conn.getresponse().status, 200)
         self.conn.request('GET', '/calendar?start=&end=')
         self.conn.request('GET', '/calendar?start=2024-01-01&end=2025-01-01')
         self.assertEqual(self.conn.getresponse().status, 200)
         self.conn.request('GET', '/calendar?start=foo')
-        self.assertEqual(self.conn.getresponse().status, 401)
+        self.assertEqual(self.conn.getresponse().status, 400)
 
                               body=encoded_form_data, headers=headers)
             self.assertEqual(self.conn.getresponse().status, expect)
         form_data = {'title': 'foo', 'description': 'foo', 'effort': 1.0}
-        post_data_to_expect(form_data, '/process?id=FOO', 401)
+        post_data_to_expect(form_data, '/process?id=FOO', 400)
         form_data['effort'] = 'foo'
-        post_data_to_expect(form_data, '/process?id=', 401)
+        post_data_to_expect(form_data, '/process?id=', 400)
         form_data['effort'] = None
-        post_data_to_expect(form_data, '/process?id=', 401)
+        post_data_to_expect(form_data, '/process?id=', 400)
         form_data = {'title': None, 'description': 1, 'effort': 1.0}
         post_data_to_expect(form_data, '/process?id=', 302)
         retrieved = Process.by_id(self.db_conn, 1)
         self.conn.request('GET', '/process?id=0')
         self.assertEqual(self.conn.getresponse().status, 200)
         self.conn.request('GET', '/process?id=FOO')
-        self.assertEqual(self.conn.getresponse().status, 401)
+        self.assertEqual(self.conn.getresponse().status, 400)
         self.conn.request('GET', '/processes')
         self.assertEqual(self.conn.getresponse().status, 200)