Exclude special-use domains from proxy

[cohesive-flight]

The extension currently proxies special-use domains, such as home.arpa, causing them to be inaccessible unless set to never be proxied. There's also the .internal TLD, which is reserved for private-use.

[ruihildt]

Can you check if this is still the case with the latest release?

[cohesive-flight]

It is still an issue with the latest release.

[ruihildt]

Sorry I didn't look more in depth first, it turns out the only domain I exclude manually is "localhost". The main logic of excluding local traffic is IP based.

Ideally I would prefer to use a third-party library, since this is definitely not my area of expertise, but in any case, I can hard-code the whole list as well.

Reference: https://datatracker.ietf.org/doc/html/rfc6761

[ruihildt]

I had a look at the RFC, here's how each domain is categorized:

Application software SHOULD NOT recognize these names as special, and SHOULD use these names as they would other reverse-mapping names.

• arpa.
• test.
• example.
• example.com.
• example.net.
• example.org.

Application software MAY recognize localhost names as special, or MAY pass them to name resolution APIs as they would for other domain names.

• localhost.

While invalid. is actually not part of the spec yet. Here's the working draft: https://datatracker.ietf.org/doc/html/draft-davies-internal-tld-02

Following the RFC, it seems the current implementation is correct. It's up to the user to add any exception they'd like. (Which is incidentally the same approach Firefox has in the Network Settings)

[ruihildt]

@cohesive-flight Is there a specific reason, adding any of these domains manually as exceptions doesn't work for you?