Fetch Failed on getDocument

    at Client.call (/usr/local/server/src/function/node_modules/node-appwrite/lib/client.js:195:15)
    at async Databases.getDocument (/usr/local/server/src/function/node_modules/node-appwrite/lib/services/databases.js:1749:16)
    at async Module.default (file:///usr/local/server/src/function/src/main.js:28:18)
    at async execute (/usr/local/server/src/server.js:208:16)
    at async action (/usr/local/server/src/server.js:225:7)
    at async /usr/local/server/src/server.js:14:5```

NodeJS 16.0
Appwrite v1.6.0 (self hosted)

The function in question:
```try {
    client.setEndpoint('https://mywebsite.com:6000/v1')
      .setProject(process.env.APPWRITE_FUNCTION_PROJECT_ID)
      .setKey(process.env.APPWRITE_API_KEY);

    const result = await databases.getDocument(
      database_id,
      collection_id,
      id
    );
    
    log(result);

  } catch (e) {
    error(e);
  }```

Possibly relevant, if I use APPWRITE_FUNCTION_API_ENDPOINT as the endpoint I instead receive a generic Nginx 404 error response - the same behaviour if I leave off the port in the current endpoint.