Function _wrapXHR

packages/browser/src/integrations/httpclient.ts:307–335

* Wraps XMLHttpRequest to capture request and response data

(client: Client, options: HttpClientOptions)

 * Wraps XMLHttpRequest to capture request and response data
 */
function _wrapXHR(client: Client, options: HttpClientOptions): void {
  if (!('XMLHttpRequest' in GLOBAL_OBJ)) {
    return;
  }

  addXhrInstrumentationHandler(handlerData => {
    if (getClient() !== client) {
      return;
    }

    const { error, virtualError } = handlerData;

    const xhr = handlerData.xhr as SentryWrappedXMLHttpRequest & XMLHttpRequest;

    const sentryXhrData = xhr[SENTRY_XHR_DATA_KEY];

    if (!sentryXhrData) {
      return;
    }

    const { method, request_headers: headers } = sentryXhrData;

    try {
      _xhrResponseHandler(options, xhr, method, headers, error || virtualError);
    } catch (e) {
      DEBUG_BUILD && debug.warn('Error while extracting response event form XHR response', e);
    }
  });
}

/**
 * Checks whether to capture given response as an event