Update redir to accept POST

app.py

@@ -44,7 +44,7 @@ def fetch():
     except Exception as e:
         return str(e), 500
 
-@app.route('/redir')
+@app.route('/redir', methods=['GET', 'POST'])
 def redir():
     target = request.args.get('url', '/')
     code = int(request.args.get('code', '302'))