In a Google App Engine project, I was trying to test my API locally. I typed localhost:8080/_ah/api/explorer into the browser, and got the following error from the redirected page (https://apis-explorer.appspot.com/apis-explorer/?base=http%3A%2F%2Flocalhost%3A8080%2F_ah%2Fapi#p/).
You are exploring an API that is described or served via HTTP instead of HTTPS. This is insecure and may be blocked by your browser. To fix this, set up a TLS proxy for your API. Alternatively, you can tell your browser to allow active content via HTTP at this site (on Chrome, click the shield in the URL bar), but this will not improve security or dismiss this message.
If I deploy my app to the cloud, and use https://my-application-id.appspot.com/_ah/api/explorer, I was able to access the explorer with no problem.
I believe the problem is localhost:8080/_ah/api/explorer is accessed with HTTP instead of HTTPS, but I do not know how to fix it. If I try to access https://localhost:8080/_ah/api/explorer, I got an SSL connection error.
