This specification defines the QUERY method for HTTP.
        A QUERY requests that the request target process the enclosed
        content in a safe and idempotent manner and then respond with the
        result of that processing. This is similar to POST requests but
        can be automatically repeated or restarted without concern for
        partial state changes.

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The IETF proposes a new HTTP QUERY method that enables safe, idempotent queries with request bodies. Unlike GET (limited by URI length) or POST (not guaranteed safe/idempotent), QUERY allows complex queries in the request content while supporting caching, automatic retries, and conditional requests. The specification defines the Accept-Query header for capability discovery, explains how servers can assign URIs to query results via Content-Location and Location headers, and addresses caching considerations where the cache key must incorporate request content and metadata.

The HTTP QUERY Method