using nginx rewrite rules with sinatra

I've been having a hard time implementing the following pattern:

1. Have a sinatra app that thinks it's hosted under / - for example

GET /input -> display a form
POST /process -> process the form

and in form.html
<form action="process" ...>

2. Expose it at host:port (currently with puma, though I'm happy to change
that if some other server makes it easier), and put it behind nginx with a
prefix, e.g. myapp, so that the actual urls are /myapp/input and
/myapp/process which rewrite to host:port/input and host:port/process

I have not been able to get the sinatra app to be entirely independent of
the myapp prefix and the puma port - I keep running into glitches where the
form posts to the wrong place, or the request hits sinatra with /myapp
still in the url so that the matching fails. Does anyone have a working
example of doing this that I can copy^take inspiration from?

martin


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