The API's JavaScript SDK is listed as https://api.stackexchange.com/js/2.0/all.js.

However, GET request produces the following response:

Status Code: 301 Moved Permanently  
Location:    https://api-v2cdn.sstatic.netjs/all.js

This Location is incorrect.
It should be https://api-v2cdn.sstatic.net/js/all.js instead.