grape-invalid-query-params

Creating a minimal example for a potential Grape/Rack/someone should handle it issue.

Setup

bundle install

To reproduce the error

1. Run bundle exec rackup to start the server.
2. Hit the localhost:9292/ping?name=%9g and you will see an error.

To use the middleware, which only works when grape is mounted on Rack, hit the following endpoint:

localhost:9292/ping-fixed?name=%9g -> This will return you a 400, saying your parameter is incorrectly encoded.