Add support for the HTTP QUERY method

[odrotbohm]

It's probably rather early stages, but it would be nice if at some point Spring's web frameworks supported the HTTP QUERY method.

[bclozel]

Do we know if this method is supported by HTTP clients and servers already?

[odrotbohm]

Node 22.2 apparently already shipped it. I didn't file the ticket for immediate resolution, I just thought it would be nice to keep track of for a potential 7.0 at some point.

[bclozel]

I meant servers that Spring Framework uses.

[bclozel]

I have tested this and this already works already for functional handlers (both WebFlux and MVC). The annotation model is not supported at the moment because RequestMethod is an enum. We could consider expanding support in various places (including clients) or generally allowing custom methods as well.

I'll move this to the backlog until we get more demand for this and concrete use cases.

[desiderantes]

Don't have any public projects, but for what is worth:

• I have internal projects that plan to use QUERY for GraphQL, because we want our cache to store those results for some services
• We have some POST endpoints that would work better as QUERY.
• We have tooling that allows to set behaviour for caching of custom methods, but blessing a whitelist is extremely annoying across team boundaries.
• GET query params are usually inadequate for more complex forms of querying, and passing a body for GET sometimes fails in annoying ways (like silently dropping the body if a middleware decides to). Failing to support QUERY is explicit and can be handled better.

So framework support would be a great help.