HostPrefix issue

Some endpoints have hostPrefix and it's necessary to include it into host such as SFN:startSyncExecution.

```
"endpoint": {
"hostPrefix": "sync-"
}
```

Start by locating the endpoint construction or host-resolution entry point and inspect how the endpoint example for SFN:startSyncExecution is represented. Verify the hostPrefix value "sync-" is incorporated into the resulting host, and confirm the behavior for endpoints without a hostPrefix.

Written by the indexing model from the issue text.