Example: when a different WireGuard key is already registered for this node, this is the error message:
$ php libexec/server-config.php
ERROR: request to "http://localhost:8082/node-api.php/server_config/v2" returned HTTP response code "500"
#0 /home/fkooman/Projects/eduVPN-v3/vpn-server-node/libexec/server-config.php(29): Vpn\Node\ConfigWriter->write()
#1 {main}
Example: when a different WireGuard key is already registered for this node, this is the error message:
```
$ php libexec/server-config.php
ERROR: request to "http://localhost:8082/node-api.php/server_config/v2" returned HTTP response code "500"
#0 /home/fkooman/Projects/eduVPN-v3/vpn-server-node/libexec/server-config.php(29): Vpn\Node\ConfigWriter->write()
#1 {main}
```