Looks like some time between 1.2 to 1.3, there was a update to Base’s Regex, and it has remove the match_data field. So you might want to downgrade base Julia to 1.2 or upgrade HTTP.jl to at least 0.8.4, where it seems to re-worked its own RegexAndMatchData?
https://github.com/JuliaLang/julia/blob/c6da87ff4bc7a855e217856757ad3413cf6d1f79/base/regex.jl#L20
https://github.com/JuliaLang/julia/blob/2d5741174ce3e6a394010d2e470e4269ca54607f/base/regex.jl#L20