servo / servo/rust-url

not-a-base on host:port string

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Dominant language
Rust
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Description

I'm using the URL library to parse a Host header, and when my application is running on localhost the value that comes out of the header is localhost:3000 (for example).

This value is parsed into a Url but comes out with cannot_be_a_base() as true, so I can't join it.

With url 2.1.1 I can't call set_scheme on the parsed URL either, but that seems to be related to another regression that multiple people have raised in #577. With 2.1.0 I can call set_scheme on the parsed URL but it still comes out as cannot_be_a_base().

I worked around this by prepending "http://" onto whatever comes out of the Host header. I see this library also has a Host struct, but I don't see any way to convert a Host into a Url. I guess what' I'm looking for is a better way to build a URL from parts.

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  1. Read the whole issue, then the project's contributing guide.
  2. Comment on the issue to say you are picking it up — it saves two people doing the same work.
  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start by reproducing the localhost:3000 case with the URL parser and compare the behavior in versions 2.1.0 and 2.1.1, including cannot_be_a_base() and set_scheme. Read the Url and Host APIs to determine how host-header values should become joinable URLs; done means the reported value has a supported path without prepending a scheme manually.

Written by the indexing model from the issue text.

Assessment

Tech stack
rust
Domain
networking
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
35/100

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