Http protocol post request parameters in PHP, php protocol post request_PHP tutorial

Http protocol post request parameters in PHP, php protocol post request

This article introduces the Http protocol post request parameters in PHP. The specific content is as follows:

In WEB development, information is basically processed in POST and GET requests and responses. GET is easy for us to understand because it is intuitive based on URLs, but POST requests are safe because of the concealment of information. Those who simulated sending caused trouble. In the next few blog posts, I will combine my own notes and understanding to explain in detail several methods of PHP making POST requests. If there are any errors, please correct me.

HTTP protocol information is an important content in WEB development. Understanding it can help us understand BS interaction more deeply, and also help us understand WEB development from a lower level. The HTTP protocol is a simple, flexible and convenient communication protocol, and it should be remembered that it is a stateless protocol, that is, it is a memoryless protocol, and each interaction is separate.

We can use the "Network" panel of the browser's development tool (IE's F12, Firefox's FireBug, etc.) to view the HTTP header information.

Generally, HTTP header information is divided into three categories: request information, response information and interactive information (personally think it is also a type of request information).

1, request information:

When visiting a website, the client will send out request information. This information does not contain data, but simply contacts the server, prompting the server to return response information.

Its format is two parts: request line and message header.

A. Request line: method (request method) path (request site address) HTTP/version (protocol/version information)

Common request methods include GET/POST/HEAD/OPTION, etc.

B. Message header:

Host (required): host and port number, the default port number is 80

Accept: Expect to receive content type (image/gif text/html */*)

Accept-Encoding: The compression type expected to be received (gzip deflat)

Accept-Charset: The character set expected to be received (utf-8)

Accept-Language(zh-CN)

Cookie: User’s cookie information

Connection: connection control

User-Agent: Client information

　... ...

The following is a typical request header:

GET index.php HTTP/1.1
Accept:text/html,application/xhtml xml,application/xml;q=0.9,image/webp,*/*;q=0.8
Accept-Encoding:gzip, deflate, sdch
Accept-Language:zh-CN,zh;q=0.8
Cache-Control:max-age=0
Connection:keep-alive
Cookie:SOHUHOMETAB=visit:2; IPLOC=CN1407; SUV=1510312046259910
Host:www.sohu.com
If-Modified-Since:Sat, 31 Oct 2015 12:45:22 GMT
Upgrade-Insecure-Requests:1
User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.99 Safari/537.36

2, response information

Server returns data

The response information is divided into three parts: status line, message header, and response body

A. Status line: HTTP/version (protocol/version information) status code status text (text description of the status code)

There are 5 categories of status codes:

1XX: Indicates a temporary response and requires the requester to continue operating

　2XX: Indicates that the response is successful and the server successfully responded to the request

3XX: Indicates redirection and requires further operation from the requester

4XX: Indicates a client error and the server cannot respond normally

5XX: Indicates a server-side error and the server cannot respond normally

For specific information, please refer to: Detailed explanation of HTTP status codes

B. Message header:

Server: Server information

Content-Encoding: Data compression format

Content-Length: data length

Content-Type: data type

Cache-Control: Cache Control

Connection: connection control

Date: date information

Expires: Expiration information of returned data

Last-Modified: Returns the last modified time

Set-Cookie: Set the client’s cookie information

　... ...

C. Response text

　That is, the returned page data is displayed in the form of HTML document on the page.

The following are common response messages

HTTP/1.1 200 OK

Cache-Control:no-cache
Connection:close
Content-Encoding:gzip
Content-Length:6947
Content-Type: text/html; charset=GBK
Date:Sat, 31 Oct 2015 13:30:11 GMT
Expires:-1
Pragma:no-cache
Proxy-Connection:keep-alive
Server:nginx/1.2.5
Set-Cookie:JSESSIONID=yiuug4yejhc1cdbzydoxlcpn;Path=/

3, interactive information

It is the request information that contains the request data. It is commonly used when users upload files, register, etc.

It is divided into three parts: request line, message header, and request body

A. Same as the request line requesting information

B. Added data about the request body based on the request header

Content-Type: Content type of uploaded information

Content-Length: The length of the uploaded information

　... ...

C. Request text:

That is the specific data string requested (name=xxx&passwork=xxx). Of course, for security reasons, the POST information is sometimes encrypted and encoded.

The following is a typical request message:

GET login.php HTTP/1.1
Host:passport.sohu.com
Accept:text/html,application/xhtml xml,application/xml
Accept-Encoding:gzip, deflate
Accept-Language:zh-CN,zh;q=0.8
Cache-Control:max-age=0
Connection:keep-alive
Content-Length:166
Content-Type:application/x-www-form-urlencoded
Referer:http://mail.sohu.com/
User-Agent:Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/45.0.2454.99 Safari/537.36
Form Data
domain=sohu.com&callback=passport20008375022711697966_cb1446298206568&appid=1113&userid=FDFFDF@sohu.com&password=a3f4384c2bc44fa909ffd0ecc5fa8eb9&persistentcookie=0

Now that you understand what the browser sends to the server, it is not difficult to use other methods to disguise yourself as a server.

In the next section, I will introduce how PHP and JS handle the most basic URLs. While solving the GET request part, I will also be fully prepared to simulate sending a POST request.

If you think this blog post is helpful to you, you can recommend it or like it. If you have any questions, you can also leave a message below and let’s discuss it together. Thank you.

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