It also erroneously filters out offsite URLs that contain the root domain, and this isn't fixable without using regex, which isn't always available in the SQLite CLI before version 3.36.0.

HTTP/1.0 does not mandate a Content-Length header in responses since keep-alive connections aren't a thing; the connection closure then signals the end of the response.
This change requires the URL metadata line for processing HTTP/1.0 data, so it plays well with `warc-dump-responses --meta`.