🐛 BUG: `/foldername` does not resolve to `/foldername/index.html` in development.

Quick checklist

• I am using the latest version of Snowpack and all plugins.

What package manager are you using?

npm

What operating system are you using?

macOS

Describe the bug

Virtual server will resolve URL’s with trailing slashes, /foldername/ will resolve to /foldername/index.html but /foldername will yield cryptic messages in the terminal:

[22:01:05] [snowpack] Error: /Users/roy/new-dir/_output/foldername/index.html - Requested content "" but only built .html
[22:01:05] [snowpack] [500] /foldername

This is not how browsers or Vercel serve works, with or without trailing slash should yield an index.html from inside a subfolder!

Thank you.

Steps to reproduce

1. git clone https://github.com/revelt/snowpack-trailing.git
2. cd snowpack-trailing
3. npm run start
4. OPEN NEW TAB IN THE TERMINAL
5. open http://localhost:8080/sub — NOTICE NO TRAILING SLASH IS PRESENT

It won’t work until trailing slash is added!

Link to minimal reproducible example (optional)

https://github.com/revelt/snowpack-trailing

[Pyrolistical]

@lgarron I deleted my previous comment and reworked the repo case.

Confirmed, reproduced on 3.8.8. My workaround was fixing the issue previously between server restarts

Repo case https://github.com/Pyrolistical/trailing-slash-regression

http://localhost:8080 ✅ works
http://localhost:8080/ ✅ works
http://localhost:8080/subfolder ❌ fails
http://localhost:8080/subfolder/ ✅ works

Also, the routes workaround does fix the issue!

routes: [
  /* This is the workaround */
  // {"match": "routes", "src": "/subfolder", "dest": "/subfolder/index.html"},
],

I do believe it is related to https://github.com/snowpackjs/snowpack/issues/3605#issuecomment-913947246

[Pyrolistical]

Yes sorry, I meant #3521.

I need to be able to configure my dev to behave exactly like my production cdn or else I can’t use snowpack. It would cause too many “works on my machine” situations.

I would say the typical behaviour of production http servers is to rewrite both http://localhost:8080/subfolder and http://localhost:8080/subfolder/ to http://localhost:8080/subfolder/index.html if it exists, or else 404. But definitely not 500!