Firebase Cloud Functions https.onCall完成，状态码：204 [英] Firebase Cloud Functions https.onCall finished with status code: 204

问题描述

Firebase函数

const functions = require('firebase-functions');
const admin = require('firebase-admin');
const cors = require('cors')({ origin: true });

exports.addMessage = functions.https.onCall((data, context) => {
  return { text: "Test" };
});

问题

问题是，当我从应用程序调用此函数时，我首先获得状态码：204 ，然后完成状态码：200

The problem is when i call this function from the app i first get finished with status code: 204 and after that finished with status code: 200

204

我该如何预防？

推荐答案

这是正常现象，您不应采取任何措施防止它。导致204的第一个请求是CORS执行预检请求。 200是最终服务请求。

This is normal, and you shouldn't do anything to prevent it. The first request that results in 204 is what happens when CORS performs a preflight request. The 200 is the final serviced request.

您可以在此处了解更多信息：

You can read more about that here:

对Post请求的两次调用：http 204和200

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