pub fn parse_headers(value: &Value) -> Result<Vec<(String, String)>, String>Expand description
Parse an activateSecurity (or rotation) headers param: an object of
string values, replacing the transport’s FULL header set (RFC 0002 §2.3).
The router validates the shape at the shared chokepoint; each host applies
the parsed set to its own transport (the router stays transport-agnostic).