Updated the logout link in the UI to use a link provided by the
/chronograf/v1/ endpoint. We also replaced many instances of string
concatenation of URL paths with path.Join, which better handles cases
where prefixed and suffixed "/" characters may be present in provided
basepaths. We also refactored how Basepath was being prefixed when using
Auth. Documentation was also updated to warn users that basepaths should
be applied to the OAuth callback link when configuring OAuth with their
provider.
The httprouter used in Chronograf did not support prefixing every route
with some basepath. This caused problems for those using the --basepath
parameter in combination with a load balancer that did not strip the
basepath prefix from requests that it forwarded onto Chronograf.
To support this, MountableRouter prefixes all routes at definition time
with the supplied prefix.
Tim Raymond & Jared Scheib