Function headers_get 

pub fn headers_get(headers: Vec<(String, String)>, name: String) -> Dynamic

Available on crate feature http only.

Case-insensitive lookup of a single response header by name. headers is the opaque Vec<(String, String)> returned as the headers field of get/post/… results — it carries no rhai-visible indexing or iteration of its own, so this is the only way to read a specific header from a script. Returns () when the header is absent.