pub fn message(
start: &str,
icap_headers: Vec<(String, String)>,
req: Option<&HttpHead>,
res: Option<&HttpHead>,
body: Option<&[u8]>,
body_kind: &str,
) -> Result<Vec<u8>>Expand description
Assemble an ICAP message: head, then the embedded HTTP heads and body, with the
Encapsulated header computed from their sizes.