pub fn append_to(headers: &mut HeaderMap, uri: &str) -> Result<(), Error>Expand description
Append a c2pa-manifest link to a header map.
Appends rather than replaces, so existing Link fields survive. The target
is percent-encoded by link::encode_target, so a hostile URI is rendered
inert rather than rejected — a CR/LF ends up inside the URI as %0D%0A
instead of starting a header of its own.