What are the solutions across domains?

Cross domain is a common scenario for front-end request interfaces , How to solve cross domain ？ And what are the most common methods ？

1. CORS
   cors You need to configure a cross domain configuration on the server ,
   After configuration, there is one more request header Access-Control-Allow-Origin, If the browser passes the judgment, it will allow cross domain
2. JSONP
   Actually by script The characteristics of the label （ No cross domain restrictions ） To achieve cross domain , Server side cooperation is also required , And can only use get Method
3. Reverse proxy
   It means using a proxy server to proxy the server
4. Forward agency
   It means to use a proxy server to proxy the client , Generally, the browser is used as the proxy server