FormDataRoutingRedirect exception from a URL without trainling slash

Question

I'm doing an ajax POST request and I'm getting this exception: ``` [Fri Nov 29 20:48:55 2013] [error] [client 192.168.25.100] self.raise_routing_exception(req) [Fri Nov 29 20:48:55 2013] [error] [client 192.168.25.100] File "/usr/lib/python2.6/site-packages/flask/app.py", line 1439, in raise_routing_exception [Fri Nov 29 20:48:55 2013] [error] [client 192.168.25.100] raise FormDataRoutingRedirect(request) [Fri Nov 29 20:48:55 2013] [error] [client 192.168.25.100] FormDataRoutingRedirect: A request was sent to this URL (http://example.com/myurl) but a redirect was issued automatically by the routing system to "http://example.com/myurl/". The URL was defined with a trailing slash so Flask will automatically redirect to the URL with the trailing slash if it was accessed without one. Make sure to directly send your POST-request to this URL since we can't make browsers or HTTP clients redirect with form data reliably or without user interaction. ``` The route definition is this: ``` @app.r…

Accepted Answer

My guess is that your `/myurl` route is not defined to accept `POST` requests, and your `//` route is, so Werkzeug picks `//`. The behavior for routes that end in a slash is explained here. By default invoking a route defined with a trailing slash without that slash triggers a redirect to the trailing slash version of the URL. This of course does not work well for `POST` requests, so you get the `FormDataRoutingRedirect` exception. I suspect if you send your `POST` request to `/myurl/` then your `//` route will be invoked just fine, though clearly this is not what you want. What I think you are missing is accepting `POST` requests on `/myurl`, which you can do as follows: ``` @app.route('/myurl', methods = ['GET', 'POST']) def my_func(): ```

FormDataRoutingRedirect exception from a URL without trainling slash

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