Function insert_headers 

pub fn insert_headers<K, V>(
    headers: &mut HeaderMap<HeaderValue>,
    values: impl IntoIterator<Item = (K, V)>,
) -> Result<(), Error>
where
    K: AsRef<str>,
    V: AsRef<str>,

Inserts multiple HTTP headers into a HeaderMap

Safely handles header name and value validation Skips empty names or values

Arguments

• headers - Mutable reference to HeaderMap
• values - HashMap of header names and values to insert

Returns

• Result<()> - Success or error if header name/value is invalid