1-http header profiling-http protocol

1. the HTTP protocol is established on the TCP/IP protocol.
2. http: hypertext protocol.
3. Basic Structure of HTTP requests: request line, message header, message body (entity content)
4. Print the details of the server message header. $ _ Server
5. On the server side, we can use an array: $ _ server to obtain information in any array.
Common examples are http_host.
Remote_addr (IP address used to access the page)
Document_root (Apache main directory)
Request_uri (requested resource name)
6. Types of requests: two main methods.
7. What is the difference between post and get requests?
1. Security: The data of the GET request is displayed in the address bar.
The data of the POST request is placed in the message body.