如何捕获OPTIONS方法调用

Question

My API is down right now, and my app crashed spectacularly due to the OPTIONS call getting a 503. After searching high and low, I've discovered it is very hard to Google "Catch failed options call", et al. without getting a bunch of posts about people asking what the OPTIONS call is, or more posts about passing options to an API call.

So, how do I capture a failed OPTIONS call in my code. Here is a sample snippet from where a call is being made that fails.

const userPreferences = yield fetch(url, options).then((response) => response);
const result = yield userPreferences.json();
if (userPreferences.status !== 200) {
  yield put(saveError(result));
} else {
  yield put(savePreferences(result));
}

Answer 1

You can't. That's something your browser will do for you when trying to figure out things like CORS. Only your browser will get the response to that. It won't pass the results to your code.