NET 10 Adds QUERY HTTP Method to Fix URL Length Limits in Search APIs

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Developers hitting HTTP 414 errors when passing hundreds of filters via GET query strings now have a cleaner solution in .NET 10, which introduces native support for the QUERY HTTP method defined in RFC 10008. QUERY behaves like GET but carries its payload in the request body, making it safe, idempotent, and cacheable — unlike POST, which signals a state-changing operation. Testing showed that while GET requests failed with 414 errors beyond roughly 500 SKU filters due to Kestrel's 8 KB request-line limit, the same search with 5,000 filters via QUERY succeeded without issue. In .NET 10, developers can use MapMethods with HttpMethods.Query on the server side and HttpMethod.Query on the client side, though higher-level conveniences like MapQuery or an [HttpQuery] attribute are not yet available. One important caveat is that ASP.NET Core does not automatically validate the Content-Type header on QUERY requests, so developers must add that check manually.

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