Cookie concept, basic use, principle, details and Chinese transmission

Cookie Exists in the browser , The browser can put Cookie The response is sent to the server , The browser can also request from the server Cookie

According to Cookie To set the required interface , Such as account number Remember my function

Basic use ：

The browser sends Cookie：

1. establish Cookie

2. send out Cookie To the server

Get the server 's Cookie Array ：

1. Receive all on the browser Cookie

2. Traverse to find what you need Cookie Output

principle ：

Cookie The implementation is based on Http Agreed

Response head ：set-cookie

Request header ：cookie

If Tomcat It is found that there is Cookie, Then it will send a response header , What's in it is Cookie The key/value pair , The same applies to request headers

details ：

By default Cookie The lifetime of is destroyed as the browser closes

have access to cookie.setMaxAge( Survival time ) Set up Cookie Life time of

  A positive number is the survival time

  A negative number means that the default browser is closed and destroyed

 0 To delete Cookie

Response Chinese Cookie：

Send and get servers Cookie when , Use URL Encoding and decoding can solve

Case study ：