The difference between forward and redirect

What are forward and redirect?
There are two main ways of jumping in servlet.Forward is also called forwarding, and redirect is called redirection.

Summary of the difference between the two:

1. From the address bar display:

1) forword is an internal redirection of the server. The server directly accesses the url of the target address and reads the contents, but the client does not know it. Therefore, if forward is used, the URL of the client browser is notwill change.

2) Redirect means that the server sends a status code according to the logic, telling the browser to re-request that address, so the address bar displays the new address.

2. In terms of data sharing:

1) Since the same request is used in the entire orientation process, forward will bring the request information to the redirected jsp or servlet for use.data can be shared

2) Redirect cannot be shared

3. From the point of application

1) Forword is generally used when a user logs in, and is forwarded to the corresponding module according to the role

2) redirect is generally used to return to the main page or jump to other websites when users log out and log in

4. In terms of efficiency:

1) Forword is efficient, but redirect is inefficient

5. Essentially:

Forword forwarding is an action on the server, while redirect redirection is an action on the client side

forward means that after the memory server is processed, the client can access the specified interface without perception. Forward is as shown below:

Redirect is sent to the client redirection address through redirection, waiting for the client to re-visit to the new address, the client is aware of this redirection, the redirection is as follows: