Ever wanted to quickly test that Google App Engine site on another computer without deploying but couldn’t because it only accepts localhost connections? Well it’s quite simple actually.
If you are using the command line add this argument to the end.
If you are using the windows launcher, select the application, click Edit > Application Settings… then in the ‘Extra command line flags’ section, add in
This works because by default, the address arguement is ‘localhost’ which will restrict the server. However, leaving it blank will allow any host to connect to it.
You could even set up port forwarding on your router to allow anyone to connect if you dare.