Support QUERY HTTP method

[TrevorBurnham]

Goals

1. Allow API routes that use the QUERY method to be defined in the Next.js App Router
2. The request body should be available in the API route, just as it is with POST, PUT, etc.
3. Caching should work similar to GET requests, but with the request body incorporated into the cache key.

Non-Goals

1. QUERY could potentially be useful for data-fetching with Server Actions, but that's beyond the scope of this request.

Background

QUERY is a new HTTP method that effectively works like GET with a body, solving the problem of content requests that require a large number of parameters.

As of Node.js 22.2.0, the QUERY method is supported: nodejs/node#51562 (comment) However, exporting a function named QUERY from a route.ts in the App Router seems to be a no-op: QUERY requests to that route receive a 400 error, and if that's the only export Next.js will log the warning "No HTTP methods exported in ".

Proposal

I'd be interested in contributing this feature.