Axios：未捕获（承诺）TypeError：无法读取未定义的属性“协议”

Question

I am getting the title error after running the following function in React:

  const postToApi = (event) => {
    event.preventDefault();
    axios.post(process.env.API_POST_URL, {step : "3"}) 
      // API_POST_URL: http://localhost:4000/api/donate
      .then(res => {
        console.log(res);
        console.log(res.data);
      })
  };

My React app is on localhost:3000. Mentioning this because the file causing the error is: isURLSameOrigin.js:51

Answer 1

Sorry, my reputation is not high enough to leave a comment and ask questions. Have you recently added the URL to your .env? If so try stopping your npm/yarn and start it again. Applications compile your .env at the beginning of your dev server. If that does not work have you tried placing the URL directly into it?