Add support for Via Header and DNS lookups in carbontxt preview #440
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This PR adds support for debugging carbontxt files.
When you add just an url, the parser preview now follows header
Via
information, as well as looking for DNS TXT records on a given domain.This makes it possible to see where a chain of lookups will follow when testing your own carbon.txt file at a given url, as well as test which domains already ready return information for a given url.