Constant CAMEL_HTTP_QUERY_HEADER 

pub const CAMEL_HTTP_QUERY_HEADER: &str = "CamelHttpQuery";

Name of the input header camel-http uses to carry the raw HTTP query string.

camel-http stores the request query (the part after ?) as a string header under this exact name (crates/components/camel-http/src/lib.rs). camel-auth cannot depend on camel-http, so this contract constant lives in camel-api. QueryParam extraction reads the raw query from this header.