POST requests seem not to work

I tried running a webapp written in python using django. On the app I login correctly and portforwarding works, but when I make a POST request from the browser, I get a 500 error from nginx.
On python I don’t see any errors. It appears that the proxy is blocking the request.

Hey! Thanks for reporting this. POST requests should work just fine, so there may be something else going on here. We’ll take a look at this and see if we can repro the issue. Stay tuned!

Can you please try running the service on a different port?