Function normalizeMethod

src/polyfills/fetch.js:195–207

* Normalized method name by uppercasing. * @param {string|undefined} method * @return {string} * @private

(method)

 * @private
 */
function normalizeMethod(method) {
  if (method === undefined) {
    return 'GET';
  }
  method = method.toUpperCase();
  devAssert(
    allowedMethods.includes(method),
    'Only one of %s is currently allowed. Got %s',
    allowedMethods.join(', '),
    method
  );
  return method;
}

/**
 * Provides access to the response headers as defined in the Fetch API.