The specification requires the filter query parameter to be reserved for filtering, and states that implementations SHOULD use this. Discussions here suggest that many developers interpret this to include filter[...] query parameters in building up complex queries. Others suggest query languages encoded into filter (e.g., Share/Propose a Filtering Strategy).
Has anyone dealt with issues related to very large queries that cannot be encoded into a query string? Many browsers limit the total length of the URL path + query string to around 2K.
What I don’t see in the specification is a way to provide very large payloads to define a query. GraphQL has been mentioned, but has the unfortunate trait that using a GET with a content entity is perhaps less well defined and supported than including a larger payload in a POST request.
I’d appreciate hearing from developers who are (or have) implemented solutions for queries that become larger than is appropriate for query strings.