It seems to me that `arc browse` does not support files in a Subversion repository.
Steps to reproduce:
Have a Subversion repository hosted in Phorge and have a file (example: README.md).
Have a similar `.arcconfig`:
```
name=.arcconfig
{
"phabricator.uri" : "https://phorge.example.com/"
}
```
Run:
```
arc browse README.md
```
Your browser web will visit this HTTP 404 Page not found page:
https://phorge.example.com/browse/master/README.md
This should happen instead:
https://sviluppo.erinformatica.it/source/<repo>/browse/README.md
To me, we have two bugs:
1. the repository is not recognized
2. the branch should be omitted in a Subversion URL