@redocly/openapi-core/lib/rules/common/response-contains-header.js

See https://github.com/Redocly/redocly-cli

import { getMatchingStatusCodeRange } from '../../utils.js';
export const ResponseContainsHeader = (options) => {
    const names = options.names || {};
    return {
        Operation: {
            Response: {
                enter: (response, { report, location, key }) => {
                    const expectedHeaders = names[key] ||
                        names[getMatchingStatusCodeRange(key)] ||
                        names[getMatchingStatusCodeRange(key).toLowerCase()] ||
                        [];
                    for (const expectedHeader of expectedHeaders) {
                        if (!response?.headers ||
                            !Object.keys(response?.headers).some((header) => header.toLowerCase() === expectedHeader.toLowerCase())) {
                            report({
                                message: `Response object must contain a "${expectedHeader}" header.`,
                                location: location.child('headers').key(),
                            });
                        }
                    }
                },
            },
        },
    };
};
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