Headers are represented as own-properties on JavaScript objects. The property keys will be serialized to lower-case. Property values should be strings (if they are not they will be coerced to strings) or an Array of strings (in order to send more than one value per header field).

    1. const headers = {
    2.   ':status': '200',
    3.   'content-type': 'text-plain',
    4.   'ABC': ['has', 'more', 'than', 'one', 'value']
    5. };
    7. stream.respond(headers);

    Header objects passed to callback functions will have a null prototype. This means that normal JavaScript object methods such as Object.prototype.toString() and Object.prototype.hasOwnProperty() will not work.

    For incoming headers:

    • The :status header is converted to number.
    • Duplicates of :status, :method, :authority, :scheme, :path, :protocol, age, authorization, access-control-allow-credentials, access-control-max-age, access-control-request-method, content-encoding, content-language, content-length, content-location, content-md5, content-range, content-type, date, dnt, etag, expires, from, if-match, if-modified-since, if-none-match, if-range, if-unmodified-since, last-modified, location, max-forwards, proxy-authorization, range, referer,retry-after, tk, upgrade-insecure-requests, user-agent or x-content-type-options are discarded.
    • set-cookie is always an array. Duplicates are added to the array.
    • For duplicate cookie headers, the values are joined together with ‘; ‘.
    • For all other headers, the values are joined together with ‘, ‘.
    1. const http2 = require('http2');
    2. const server = http2.createServer();
    3. server.on('stream', (stream, headers) => {
    4.   console.log(headers[':path']);
    5.   console.log(headers.ABC);
    6. });