use https in external urls

before:

```
% curl -F c=@- localhost:10002 < foo.py 
http://localhost:10002/AAAn
uuid: fb54c683-bb5d-4adb-9073-61d13d26c326
```

after:

```
% curl -F c=@- localhost:10002 < foo.py 
https://localhost:10002/AAAn
uuid: fb54c683-bb5d-4adb-9073-61d13d26c326
```