@wordpress/api-fetch/build-module/middlewares/http-v1.js

Utility to make WordPress REST API requests.

/**
 * Set of HTTP methods which are eligible to be overridden.
 *
 * @type {Set<string>}
 */
const OVERRIDE_METHODS = new Set(['PATCH', 'PUT', 'DELETE']);

/**
 * Default request method.
 *
 * "A request has an associated method (a method). Unless stated otherwise it
 * is `GET`."
 *
 * @see  https://fetch.spec.whatwg.org/#requests
 *
 * @type {string}
 */
const DEFAULT_METHOD = 'GET';

/**
 * API Fetch middleware which overrides the request method for HTTP v1
 * compatibility leveraging the REST API X-HTTP-Method-Override header.
 *
 * @type {import('../types').APIFetchMiddleware}
 */
const httpV1Middleware = (options, next) => {
  const {
    method = DEFAULT_METHOD
  } = options;
  if (OVERRIDE_METHODS.has(method.toUpperCase())) {
    options = {
      ...options,
      headers: {
        ...options.headers,
        'X-HTTP-Method-Override': method,
        'Content-Type': 'application/json'
      },
      method: 'POST'
    };
  }
  return next(options);
};
export default httpV1Middleware;
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