ketting/dist/middlewares/accept-header.js

Opinionated HATEOAS / Rest client.

/**
 * This middleware injects a default Accept header.
 *
 * The list of content-types is generated from the Client's
 * 'contentTypeMap'.
 */
export default function (client) {
    return async (request, next) => {
        if (!request.headers.has('Accept')) {
            const acceptHeader = Object.entries(client.contentTypeMap).map(([contentType, [, q]]) => contentType + ';q=' + q).join(', ');
            request.headers.set('Accept', acceptHeader);
        }
        return next(request);
    };
}
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