When you configure a coder_app that is path based, Coderd will always strip the subpath from the proxied request.

So when you hit

GET /@Emyrk/workspace.main/apps/code-server/

The app sees the request as:

GET / 

This happens in the code here:

It strips the base path from the request, assuming the application behind the proxy does not want this base path.

However

Many applications like VSCode Web support flags like --server-base-path, which allows hosting an application on a subpath. This is required, because all urls made from the app are absolute.

So today, if you do not configure --server-base-path, the app will fail to load resources, since it constructs urls from "/". And if you configure the base path, our proxy strips that, so you get a 404 as you hit / on the app, where it expects /@Emyrk/workspace.main/apps/code-server/

Solution

We should have an option on coder_app to not strip the base path from proxied requests. Some boolean like: url_passthrough to tell the proxy service to not alter the request url in any way.

Some other apps that would require this (off the top of my head)

• RStudio
• Jupyter (pretty sure)

Why do this

This will expand support for more path based applications.

Would fix this: coder/modules#288