Function batchFetchJsonFor

src/batched-json.js:49–73

(ampdoc, element, options = {})

 *     result or rejected if response is invalid.
 */
export function batchFetchJsonFor(ampdoc, element, options = {}) {
  const {
    expr = '.',
    refresh = false,
    url = element.getAttribute('src'),
    urlReplacement = UrlReplacementPolicy_Enum.NONE,
    xssiPrefix = undefined,
  } = options;
  assertHttpsUrl(url, element);
  const xhr = Services.batchedXhrFor(ampdoc.win);
  return requestForBatchFetch(element, url, urlReplacement, refresh)
    .then((data) => {
      return xhr.fetchJson(data.xhrUrl, data.fetchOpt);
    })
    .then((res) => Services.xhrFor(ampdoc.win).xssiJson(res, xssiPrefix))
    .then((data) => {
      if (data == null) {
        throw new Error('Response is undefined.');
      }
      return getValueForExpr(data, expr || '.');
    })
    .catch((err) => {
      throw user().createError('failed fetching JSON data', err);
    });
}

/**
 * Handles url replacement and constructs the FetchInitJsonDef required for a