Feature request: Add support for sparse registry about panamax

[wcampbell0x2a]

I have a small project to download a small portion of crates.io, meant to be used with the new sparse register feature. Panamax should need only a small addition for this, since the new version just needs http.

https://github.com/wcampbell0x2a/zerus

[k3d3]

I'm very interested in having sparse registry support in Panamax! Like @wcampbell0x2a mentioned, I'm hoping there shouldn't be too much more than to just expose the crates.io-index directory via HTTP.

[Christiaan676]

@wcampbell0x2a @k3d3
Yes, agree. Looking at the RFC, Etag or If-Modified-Since header support might be needed as well.

[k3d3]

Now implemented in the panamax serve command as of v1.0.10. The sparse index is now exposed at /index/.

That means if your previous registry line in .cargo/config was:

registry = https://panamax.internal/git/crates.io.index

You will be able to use the sparse index by changing it to:

registry = sparse+https://panamax.internal/index/

I've also updated the panamax serve homepage to reflect this new URL.