--web.route-prefix doesn't work as expected

[beorn7]

What did you do?

Ran prometheus with --web.route-prefix=/prefix

What did you expect to see?

All paths prefixed with /prefix

What did you see instead? Under which circumstances?

• http://localhost:9090/prefix redirects to http://localhost:9090/graph, which obviously doesn't work.
• Typing http://localhost:9090/prefix/graph explicitly still has little success because all the /static/ resources are not prefixed.

• Prometheus version:

prometheus, version 2.2.0 (branch: master, revision: 60dafd4)
build user: bjoern@reasonableresolution
build date: 20180323-15:46:34
go version: go1.10

[brian-brazil]

#4025 was not the right fix for this. Can you indicate what the external URL was in this case?

[abh]

It seems like the original problem here would have been fixed by using external-url instead of route-prefix.

[juliusv]

Has this been fixed in #4256 now?