Rename X-Forwarded-PathBase to X-Forwarded-Prefix

[Tratcher]

Follow up to #225 and #13.

Per some user provided research here, X-Forwarded-Prefix is the more common name for this header.

/cc: @damianh

[damianh]

Interesting...thx for cc. Searching up on this and most of the X-Forward-Prefix content (SO questions, docs in various proxies etc) seems to be a recent thing (last couple of years). I've reckon I've been using X-Forward-PathBase for nearly a decade... 🤷‍♂️

Since a variety reverse proxy implementations are converging on X-Forward-Prefix I agree that renaming is reasonable.

On a related item, will Microsoft.AspNetCore.HttpOverrides also be updated to use this header? If so, I could kill off this project :)

[Tratcher]

On a related item, will Microsoft.AspNetCore.HttpOverrides also be updated to use this header?

dotnet/aspnetcore#23263 tracks that.

[karelz]

Triage: There is de facto standard for this (see dotnet/aspnetcore#23263 (comment)), we should implement it.

[karelz]

Should be fairly simple - anyone interested?