https://www.reddit.com/r/tf2/comments/8glw2m/website_operators_and_update_enthusiasts_that/
The breaking of the original GetSchema endpoint looks to have been deliberate, as a deprecation notice has gone up with status 80, stating as follows:
"note": "Deprecated: See GetSchemaOverview and GetSchemaItems"
https://www.reddit.com/r/tf2/comments/8glw2m/website_operators_and_update_enthusiasts_that/
The breaking of the original GetSchema endpoint looks to have been deliberate, as a deprecation notice has gone up with status 80, stating as follows:
"note": "Deprecated: See GetSchemaOverview and GetSchemaItems"