Follow up to Can I use an at symbol (@) inside URLs? Based on the top voted answer, the @ is not a reserved character in the URL path (although it is in the host). However, given an @ in the path...

TL;TR: Is (first) question mark in URL part of query or is is just a separator followed by query? The RFC 1738, section 3.3, suggests that the "?" (question mark) is not part of the query...