Add support for stylesheets about srihash.org HOT 2 CLOSED

I think the desired output format should be defined via the UI, not programmatically. For example, a drop-down box listing several formats (script, stylesheet, image, etc). This would be consistent with the way resources are handled when included in HTML - by definition, not by content-type.

A helper function built into the UI may, however, automatically suggest/highlight an appropriate output format (initially by checking for a file extension, then by doing a HEAD request to read the content-type).

from srihash.org.

Ideally, I'd like this app to be a one-click thing:

1. paste your URL
2. press Enter (or click "Submit")

Though if we can automatically pick the right element type from the drop-down (using either the header sniffing you suggest or looking at the file extension), then in practice it's pretty close to "one-click".

from srihash.org.