better errors if distributable.url returns a bad content type

[ddobrinskiy]

@mxcl something looks broken in handling the versions, see last part of semver

source code to reproduce: pkgxdev/pantry@6d4cd3f

[ddobrinskiy]

oops! my bad, just a malformed URL on my part

Still, it's a bit weird how that is displayed in logs

[mxcl]

Yeah this is a bug in our curl handling, reopening.

[mxcl]

Yeah actually I cannot figure out why it doesn’t error cleanly. Is is possible the URL you downloaded returns a HTTP 200 even though it didn’t actually provide a tarball?

[ddobrinskiy]

@mxcl yes, it indeed returned 200

https://github.com/quarto-dev/quarto-cli/releases/tag/v1.3.242

[mxcl]

right, content type is HTML.

We could probs figure this out and give a better error. Will leave open until we do that.