Function extract_header_value

src/sip/parser.rs:333–344

通用头部值提取 根据头部名称从 SIP 请求文本中提取对应的值

(msg: &str, name: &str)

///
/// 根据头部名称从 SIP 请求文本中提取对应的值
pub fn extract_header_value(msg: &str, name: &str) -> Option<String> {
    let name_lower = name.to_lowercase();
    let search_prefix = format!("{}:", name_lower);
    for line in msg.lines() {
        let trimmed = line.trim();
        if trimmed.to_lowercase().starts_with(&search_prefix) {
            let value = trimmed[name.len() + 1..].trim();
            return Some(value.to_string());
        }
    }
    None
}

/// 提取 SIP 方法名
///