@nhost/nhost-js/dist/src/fetch/middlewareWithHeaders.js

Nhost JavaScript SDK

/**
 * Headers middleware for the Nhost SDK.
 *
 * This module provides middleware functionality to automatically attach
 * default headers to all outgoing requests, while allowing request-specific
 * headers to take precedence.
 */
/**
 * Creates a fetch middleware that attaches default headers to requests.
 *
 * This middleware:
 * 1. Merges default headers with request-specific headers
 * 2. Preserves request-specific headers when they conflict with defaults
 *
 * The middleware ensures consistent headers across requests while allowing
 * individual requests to override defaults as needed.
 *
 * @param defaultHeaders - Default headers to attach to all requests
 * @returns A middleware function that can be used in the fetch chain
 */
export const withHeadersMiddleware = (defaultHeaders) => (next) => async (url, options = {}) => {
    const headers = new Headers(options.headers || {});
    const defaults = new Headers(defaultHeaders);
    defaults.forEach((value, key) => {
        if (!headers.has(key)) {
            headers.set(key, value);
        }
    });
    return next(url, { ...options, headers });
};
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