components/shared/net/fetch/headers.rs


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/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at https://mozilla.org/MPL/2.0/. */

use headers::HeaderMap;

/// <https://fetch.spec.whatwg.org/#concept-header-list-get>
pub fn get_value_from_header_list(name: &str, headers: &HeaderMap) -> Option<Vec<u8>> {
    let values = headers.get_all(name).iter().map(|val| val.as_bytes());

    // Step 1
    if values.size_hint() == (0, Some(0)) {
        return None;
    }

    // Step 2
    return Some(values.collect::<Vec<&[u8]>>().join(&[0x2C, 0x20][..]));
}