Document the official MIME type for .astro files

[MichaelDeBoey]

I’m working on improving MIME type support for modern web framework source files across tooling, servers, and content-type databases.

Currently, there does not appear to be an officially documented MIME type for .astro files.
Some tools/frameworks use conventions such as text/x-<framework>, but there is no authoritative reference from the Astro project itself.
This create ambiguity for other projects to rely on a consistent mapping.

Having an official statement would help:

• MIME databases include the mapping
• web servers and CDNs configure correct content types
• editors and language servers align
• reduce ecosystem fragmentation

Would the Astro project be open to document an official recommendation for the MIME type of .astro files?

This does not necessarily require IANA registration though.
A short note in the docs would already provide a reliable reference for downstream projects I think.

If another MIME type from text/x-astro (like text/plain, text/html, ...) is preferred, documenting that choice would be equally helpful.

Thank you for your work and for considering this!

CC/ @FredKSchott @natemoo-re

[bjohansebas]

It comes from this (jshttp/mime-db#446): for Express to accept adding a MIME type for a certain file type, it needs to be based on an official source. Ideally, if Astro wants it to be added, it should be registered through IANA. But that’s not always the case—sometimes a simple reference in the documentation stating what the MIME type should be is enough.

Personally, I’m not sure what the point of adding a special MIME type for .astro files is. It’s not like they’re meant to be served over the internet. But the decision to have an official MIME type ultimately belongs to the project. I can help get it added to mime-db