I was visiting /api/api-browser but that is not the correct url it seems.
I clicked the global api browser in system/nodes and it redirects me to:
https://localhost/graylog/api/graylog/api-browser/global/index.html which gives me a 404 not found
I then manually edit the url to https://localhost/graylog/api/api-browser/global/index.html which does load the api browser visually but it does not function.
Closer inspection shows that the console has ~69 errors all like this:
shred.bundle.js:2608 GET https://localhost/graylog/api/api-docs/global/streams/{streamid}/alerts/{alertId}/history 500 (Internal Server Error)
The HTTP response is:
java.net.URISyntaxException: Illegal character in path at index 48: http://localhost:80/api/api-docs/global/streams/{streamid}/alerts/{alertId}/history
thanks!