pub fn extract_header(message: &str, name: &str) -> Vec<String>Expand description
Extract all occurrences of a header from a raw SIP message.
Scans all lines up to the blank line separating headers from the message
body. Header name matching is case-insensitive (RFC 3261 §7.3.5) and
recognizes compact header forms (RFC 3261 §7.3.3): searching for "From"
also matches f:, and searching for "f" also matches From:.
Header folding (continuation lines beginning with SP or HTAB) is unfolded into a single logical value per occurrence. Each header occurrence is returned as a separate entry — values are not comma-joined, per RFC 3261 §7.3.1 which forbids joining for Authorization, Proxy-Authorization, WWW-Authenticate, and Proxy-Authenticate.
Returns an empty Vec if no header with the given name is found.