Install EventLogging with a schema defined on meta.wikimedia.org and trigger an event and you'll see an error "Missing or empty schema"
The http request to meta gets redirected from http to https as it fires a request to:
http://meta.wikimedia.org/w/api.php?action=jsonschema&revid=10720373
The solution is to add redirects.
Change 232297 had a related patch set uploaded (by Jdlrobson):
Allow redirects for EventLogging schemas
$wgEventLoggingSchemaApiUri defaults to http. The default could of course be changed as an alternative solution but it should at least provide a better error message in this case (currently sends an empty schema).
/Better message to frontend developer/. Sending an empty schema doesn't make it clear where the problem lies or that there is even a problem.
It sounds like we should at least change the default given that we know it will never work.
Change 232450 had a related patch set uploaded (by Legoktm):
Update a bunch of links to use HTTPS instead
Change 232297 abandoned by Jdlrobson:
Allow redirects for EventLogging schemas
Reason:
Since the bug got closed I guess no one cares if we break things silently.