Nginx "Bad Request" 400 error because of % in the body text?

tip.md

If you have a body like this:

payload={"data": "5 %"}

Then nginx will most likely give you a 400 bad request error.

To get around this, encode the json with "x-www-urlencoded" encoding.

A web framework like rails will transparently decode "x-www-urlencoded" for you.