Make all links relative.

[vmarmol]

This will allow cAdvisor to be reverse proxied, and fixes a long-standing feature request :)

Fixes #513
Fixes #566
Fixes #596
Fixes #667

[vmarmol]

/cc @rjnagal

[rjnagal]

LGTM

[schmichri]

+1
I don't understand it. I can see it in your codings but it's not document and I have the feeling it's not working at all.
IMHO must have for production environment.

[AnthonyWC]

Re: #667

I tested (via https://x.x.x.x/cadvisor/):

    location /cadvisor/ {
      proxy_pass         http://prometheus_cadvisor_1:8080/;
      proxy_set_header   Host $host;
      proxy_set_header   X-Forwarded-For $remote_addr;
    }

Results in 404 but this work

    location / {
      proxy_pass         http://prometheus_cadvisor_1:8080/;
      proxy_set_header   Host $host;
      proxy_set_header   X-Forwarded-For $remote_addr;
    }

So issue still exists as they reverted the change earlier and never fix it.

I can manually specify the url path, like this:

    location / {
      proxy_pass         http://prometheus_cadvisor_1:8080/containers/;
      proxy_set_header   Host $host;
      proxy_set_header   X-Forwarded-For $remote_addr;
    }

It doesn't display properly but doesn't show 404 error, and any non /containers/ links will break.