[fabian2k]

There are some things that simply don't fit into the REST structure, the most common one for me is bulk operations. Operating on multiple instances of a specific resource is a common thing, and you need a non-REST endpoint to do it properly. Of course you could just iterate over the items, but then you can never have transactional behaviour (either no write happens or all of them happen). And of course it's terribly slow for larger number of items.

Another annoyance is GET endpoints with complex filters like e.g. the index route for a specific resource. It's really annoying to be limited to the query params instead of a request body for that.