pub fn extract_all_headers(message: &str) -> Vec<(String, String)>Expand description
Extract all headers from a raw SIP message as name-value pairs.
Returns headers in wire order, preserving multiple occurrences of the
same header name as separate entries. Header folding is unfolded per
RFC 3261 §7.3.1. Header names are returned as-is from the wire (not
canonicalized — compact forms like f: remain f, not From).
Stops at the blank line separating headers from body.