hugo server fails to serve the site when baseURL contains a subpath without hostname

[yihui]

What version of Hugo are you using (hugo version)?

$ hugo version
0.76.4

Does this issue reproduce with the latest release?

Yes.

Reproducible example

Here is a small reproducible example: server-baseurl.zip

In config.yaml, it has baseurl: "/subpath/". Then we run hugo server:

Start building sites … 

                   | EN  
-------------------+-----
  Pages            | 32  
  Paginator pages  |  0  
  Non-page files   |  0  
  Static files     |  2  
  Processed images |  0  
  Aliases          |  0  
  Sitemaps         |  1  
  Cleaned          |  0  

Built in 87 ms
Watching for changes in .../{content,layouts,themes}
Watching for config changes in .../config.yaml
Environment: "development"
Serving pages from memory
Running in Fast Render Mode. For full rebuilds on change: hugo server --disableFastRender
Web Server is available at //localhost:1313///subpath/ (bind address 127.0.0.1)
Press Ctrl+C to stop

Open http://localhost:1313///subpath/ and it shows 404 not found. http://localhost:1313/subpath/ and http://localhost:1313 don't work, either.

It works if I specify the full URL like baseURL: http://example.org/subpath/, but I prefer not hardcoding the protocol or domain in the base URL.

[bep]

That is not a valid baseURL.

[yihui]

I'm sure it worked before, although I'm not sure which version of Hugo broke it. Being able to set a base URL without the protocol or hostname makes the generated website more portable, i.e., the site can be moved to any domain and works with any protocols.

[yihui]

Okay, it seems to work again if I remove the leading slash, i.e. use baseURL: subpath/ instead of baseURL: /subpath/. I'm closing this issue for now. Thank you!

[github-actions]

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