web: fix double prefix redirect #2832
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Fixes #2825 and #2817.
The problem was that when using the
.Redirectmethod of the router after is has been prefixed, it will use the route prefix and external url path joined with the graph path, ending up with being redirected to/prometheus/prometheus/graph, when-web.external-urlis set to a URL with/prometheusas the path and no-web.route-prefix(which makes it default to the same path).The bug was previously introduced by #2755.
@brian-brazil @fabxc @grobie