How to solve vue forwarding 200 status code

Vue is a popular front-end development framework. With the trend of front-end and back-end separation, more and more developers choose to use Vue to build front-end applications. Forwarding the 200 status code is a common problem encountered in Vue development. question. Below, let’s take a closer look at this issue.

First of all, it needs to be clear that when Vue sends a request to the backend, the server will return an HTTP status code to inform Vue of the result of the request processing. HTTP status code is a status indicator in the HTTP protocol, which tells the client whether the result of the request is success, failure, redirection, etc.

In Vue, common request methods include GET, POST, PUT, DELETE, etc. The request status codes of these methods are different. Common status codes are 200, 201, 204, 400, 401, 404 , 500, etc. Among them, the 200 status code indicates that the server successfully processed the request. Forwarding the 200 status code means that for some reason, we need to force the status code returned by the backend to 200.

Why do we need to forward the 200 status code? In actual project development, we may encounter the problem of cross-domain requests. When making cross-domain requests, the browser usually initiates an OPTIONS preflight request to determine which HTTP methods, header information, etc. can be used.

If the backend does not process the OPTIONS request and directly returns a non-200 status code, the browser will intercept it and disallow cross-domain requests. In this case, we need to change the status code returned by the backend to 200 to bypass the browser's interception.

How to forward 200 status code in Vue? Vue provides a method to modify the status code returned by the backend to 200 through the axios interceptor.

Specifically, we can add an interceptor in axios to process the return result before returning the data, and force the status code returned by the backend to 200. The code is as follows:

import axios from 'axios';

axios.interceptors.response.use(response => {
  if (response.config.url !== '/login' && response.status !== 200) {
    response.status = 200;
  }
  return response;
}, error => {
  return Promise.reject(error);
});

In this code, we add an interceptor through the axios.interceptors.response.use method to process the data returned by the backend. First, determine whether the currently requested URL is a login request. If not, the status code is forcibly changed to 200 and the processed result is returned.

Finally, it should be noted that forwarding the 200 status code is only a solution. If the backend can handle the OPTIONS request and return the status code correctly, then there is no need to forward the status code.

In project development, we need to choose a solution that suits us based on the actual situation to avoid unnecessary trouble. Forwarding the 200 status code through the Vue interceptor can solve the browser cross-domain problem, but it needs to be used with caution in the project to avoid adverse consequences.

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