title: Try out api from devportal but get error " TypeError: NetworkError when attempting to fetch resource"
body: <p>I have run API-Manager 4.0.0 by ./api-manager.sh and i get
  https://ip:9443/publisher, https://ip:9443/devportal, https://ip:9443/carbon,</p>
  <p>I create an api on publisher and subscribe on devporta，but when i try out it by token,
  it gives me a response with &quot;TypeError: NetworkError when attempting to fetch resource&quot; ,
  I am searching for a long time on net. But no use. Please help or try to give some ideas how to achieve this, Thanks in advance</p>