Checklist

• I've searched for similar feature requests. There is an FR from 2015: example.localhost is a unknown host #373

Enhancement request

HTTPie should resolve special domain names per RFC6761, unless HTTPie uses a name resolution library that isn't part of the code base. According to the RFC:

Name resolution APIs and libraries SHOULD recognize localhost
names as special and SHOULD always return the IP loopback address
for address queries and negative responses for all other query
types. Name resolution APIs SHOULD NOT send queries for
localhost names to their configured caching DNS server(s).

Problem it solves

I use k3d to develop software. It assigns localhost domains to Services, for example: grafana.k3d.localhost:8080. If httpie resolved .localhost domain names as the loopback address I could use it for scripting in my local development environment. As it stands, I'm using CURL, but httpie is faster and more pleasant to write.

Additional information, screenshots, or code examples

Curl has implemented support for this somewhat recently: curl/curl#9296
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