dashboard: Can't load dashboard with kubernetes >=1.6 and LAN required proxy

Issue details

Environment

Ubuntu 16.04 with current apt install kubeadm kubernetes-cli

Dashboard version: how to find out the version? (dashboard doesn't open)
Kubernetes version: Client Version: version.Info{Major:"1", Minor:"6", GitVersion:"v1.6.1", GitCommit:"b0b7a323cc5a4a2019b2e9520c21c7830b7f708e", GitTreeState:"clean", BuildDate:"2017-04-03T20:44:38Z", GoVersion:"go1.7.5", Compiler:"gc", Platform:"linux/amd64"}
Server Version: version.Info{Major:"1", Minor:"6", GitVersion:"v1.6.0", GitCommit:"fff5156092b56e6bd60fff75aad4dc9de6b6ef37", GitTreeState:"clean", BuildDate:"2017-03-28T16:24:30Z", GoVersion:"go1.7.5", Compiler:"gc", Platform:"linux/amd64"}
Operating system: Ubuntu 16.04
Node.js version: not installed
Go version: not installed

Steps to reproduce

Have a VM with HTTP_PROXY/HTTP_PROXY set to a proxy server and NO_PROXY set to localhost,127.0.0.1,<current_ip>

follow the dashboard tutorial:

• install with create -f <link>
• kubectl proxy
• open localhost:8001/ui in browser

Observed result

Despite no_proxy and NO_PROXY being set to both localhost and <apiserver_ip> a response 503 from the proxy is shown (verified by looking at the HTML content of the response), after redirecting internally to /api/v1/namespaces/kube-system/services/kubernetes-dashboard/proxy/.

Calling the curl request from the proxy logs results in a different error that seems to be related to RBAC.

Logs:

I0418 15:17:45.992083   42324 loader.go:354] Config loaded from file /etc/kubernetes/admin.conf
I0418 15:17:45.997241   42324 cached_discovery.go:118] returning cached discovery info from /home/kube/.kube/cache/discovery/<eth0_ip>_6443/servergroups.json
Starting to serve on 127.0.0.1:8001I0418 15:17:55.209878   42324 proxy_server.go:91] /ui/ matched ^.*
I0418 15:17:55.210148   42324 proxy_server.go:91] 127.0.0.1 matched ^127\.0\.0\.1$
I0418 15:17:55.210218   42324 proxy_server.go:130] Filter accepting GET /ui/ 127.0.0.1
I0418 15:17:55.211285   42324 round_trippers.go:398] curl -k -v -XGET  -H "Accept-Language: en-US,en;q=0.5" -H "Accept-Encoding: gzip, deflate" -H "X-Forwarded-For: 127.0.0.1" -H "Upgrade-Insecure-Requests: 1" -H "User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0" -H "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8" https://<eth0_ip>:6443/ui/
I0418 15:17:55.246977   42324 round_trippers.go:417] GET https://<eth0_ip>:6443/ui/ 307 Temporary Redirect in 35 milliseconds
I0418 15:17:55.246997   42324 round_trippers.go:423] Response Headers:
I0418 15:17:55.247001   42324 round_trippers.go:426]     Location: /api/v1/namespaces/kube-system/services/kubernetes-dashboard/proxy
I0418 15:17:55.247004   42324 round_trippers.go:426]     Content-Type: text/html; charset=utf-8
I0418 15:17:55.247008   42324 round_trippers.go:426]     Content-Length: 102
I0418 15:17:55.247012   42324 round_trippers.go:426]     Date: Tue, 18 Apr 2017 13:17:55 GMT
I0418 15:17:55.277869   42324 proxy_server.go:91] /api/v1/namespaces/kube-system/services/kubernetes-dashboard/proxy/ matched ^.*
I0418 15:17:55.278097   42324 proxy_server.go:91] 127.0.0.1 matched ^127\.0\.0\.1$
I0418 15:17:55.278161   42324 proxy_server.go:130] Filter accepting GET /api/v1/namespaces/kube-system/services/kubernetes-dashboard/proxy/ 127.0.0.1
I0418 15:17:55.278289   42324 round_trippers.go:398] curl -k -v -XGET  -H "User-Agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:52.0) Gecko/20100101 Firefox/52.0" -H "Accept: text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8" -H "Accept-Language: en-US,en;q=0.5" -H "Accept-Encoding: gzip, deflate" -H "X-Forwarded-For: 127.0.0.1" -H "Upgrade-Insecure-Requests: 1" https://<eth0_ip>:6443/api/v1/namespaces/kube-system/services/kubernetes-dashboard/proxy/
I0418 15:19:32.974175   42324 round_trippers.go:417] GET https://<eth0_ip>:6443/api/v1/namespaces/kube-system/services/kubernetes-dashboard/proxy/ 503 Service Unavailable in 97695 milliseconds
# note: the following response is verfied to be from my environment proxy not from the kube proxy
I0418 15:19:32.974199   42324 round_trippers.go:423] Response Headers:
I0418 15:19:32.974206   42324 round_trippers.go:426]     Cache-Control: no-cache
I0418 15:19:32.974211   42324 round_trippers.go:426]     Content-Type: text/html; charset=utf-8
I0418 15:19:32.974216   42324 round_trippers.go:426]     Pragma: no-cache
I0418 15:19:32.974219   42324 round_trippers.go:426]     Date: Tue, 18 Apr 2017 13:19:32 GMT

Expected result

opens the dashboard

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