Zhang San has a meal - did he eat the difference between get and post in HTTP?

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background ： It's an ordinary night , It was also an extraordinary night . Late at night , Steamed Rice King ——''POST. Zhang San '' and noodles The emperor ——''GET. Li Si ''( Hereinafter referred to as" ： Zhang San po、 Li Si ge), The two brothers were beaten by the big brother of object-oriented programming , Forced to drift to Mount Everest in the computer network —— The five-star Inn on the application layer mountain ——HTTP Inn —— having dinner ！！！

         Just entered the hotel , A column of prominent slogans at the door of the hotel came into view ： 

• http1.0 and http1.1 It's all based on TCP/IP Application layer protocol ,GET Methods and POST Methods are sent at the transport layer tcp Message transmission , There is no difference in essence , But in practice , There will be a difference .

         Now Zhang San po The student asked ： Since there is no difference in essence , Why do you have to divide GET and POST Method ？

         Li Si ge： You are so stupid ！ Then you usually eat , Why eat with chopsticks and spoon ......

        Zhang San po： No , My chopsticks ran away with people last year , In recent years, I only eat with a spoon .

        Li Si ge： roll ！！！

• transmission tcp message = Zhang San po And Li Si ge The process of eating                       
• Use POST Method and use GET Method = Eat with a spoon and chopsticks
• Set up POST、GET Purpose ： To complete tcp Multiple processing methods are set for transmission message

        Li Si ge I'll see you for a long time , So he asked ： Don't you know there is something called noodles in the world ？ Don't tell me. , You never eat noodles with chopsticks ？

        Zhang San po： No , I never eat noodles , I only eat rice , So everyone calls me king of rice —— Zhang San po.

• Spoon = POST           chopsticks = GET
• Use POST Submit data  = Use a spoon to eat rice
• Use GET Get web information =  Use chopsticks to eat noodles
• To deal with different things , Define different methods , Targeted treatment

        Zhang San po See Li Si ge Not too smart , So I went straight to the shopkeeper and ordered a bowl Fish bone noodles , Found a place far away from Li Si ge Sit down in the corner and rest , Li Si ge before , Learn Zhang San in a modular way po The appearance of , Ordered a , The super essence version is big Dace rice ball —— Then he sat on Li Si ge side .

        The inn is very efficient , Delicious rice balls and hot noodles 10 It'll be on the table in seconds , The two tacitly wolfed down .

        Li Si ge Wordy at one breath 3 strip 2 Rice long noodles , But my mouth is not big enough , It can only be clamped off , Divided into two wordy .

        Zhang San po： Li Si ge, Do you know how many grains of rice I eat with a spoon ？

        Li Si ge： Your rice balls are lump by lump , Directly into a big Body, How do I know how many pills there are ？？？

        Zhang San po： But I can see that you are wordy with chopsticks 3 Noodles ！！！

        Li Si ge： Why should I let you see me eat some noodles , So that you can ask me this question ！！！！！

• The number of grains of rice eaten by a spoon ——POST Data parameters are not visible , The information is filled in Body Partial transmission
• The number of noodles eaten with chopsticks ——GET The data parameters are visible in the address bar , The data parameters are spliced in URL after （ Insecurity ）
• There is no rule on how long a mouthful of noodles can only be wordy , But the size of the mouth is limited , Limit the length of wordy noodles ——
• HTTP The standard is not clearly formulated URL The length of , But general browsers support URL The length is , Therefore use GET The transmission of data will receive URL Length limitation .

        Li Si ge： I will never forget this night

        Zhang San po： Why ？ Is it because you are so happy with me that you will never forget it ？ I'm so sorry ！

• POST The request will not be cached by the browser （ Push agreement ）
• GET The request will be cached by the browser （ Pull agreement ）, Never forget ~

       （hint：  The ancestral traditional ceremony of their school , After a meal, you must shout ： I'm full ！ To show respect for the hard work of the working people )  (hint： Eat noodles , It means there is really no fish bone , Eat the rice balls , May be stuck in the throat , Have to confirm twice )   

         Ten minutes passed , Li Si ge： I'm full ！( Means no fish bones )

        Zhang San po Throw the big bowl on the table , Shout ： I'm full ！

        Zhang San po： no ...... no ...... Cough ......ge, Li Si ge I got stuck on a fishbone ！！！

• GET Request header and data Send along , With one ~
• POST The request first sends the request header , Wait for the server to respond , Sending data
• When the network environment is good , The time difference between two packets can be ignored , stay Firefox in POST Send the bag only once .

（ The food in this shop is unique in the world , People who haven't practiced stomach strength can't digest , Zhang San po I haven't practiced , But Li Si ge Practise ） 

        Soon in Li Si ge With the help of the , Zhang San po Successfully remove the fishbone , But at this moment , Zhang San po My stomach can't digest the dace rice balls in this inn , So my stomach hurts , And Li Si ge But nothing .

• The stomach = The server        
• The server needs to get the requested data in a specific way  
• The server processes GET Need to pass through Request.QueryString To get data
• The server processes POST Need to pass through Request.Form To get data

         After a struggle , Zhang San po Successfully spit out the fish bone just eaten , By the way, at Li Si ge I also vomited a few lumps of rice balls just after my stomach . Li Si ge Felt a trace of pain , He struggled , Hesitating , Shouting , But he still didn't spit out , His stomach gradually became powerful —— How powerful —— Get stronger —— In less than a quarter of an hour , Li Si ge Gained a superpower —— Permanent immunity Zhang San po Vomit attack ！！！ And zhang SAN po After suffering like hell , Since then, the stomach has been invincible ！！！

• Zhang San po Changed the function of the stomach and became more powerful
• Li Si ge Left a permanent immunity
• POST You can modify the resources on the variable server
• GET The requested resource will Actively cached by the browser , Request the same content again , The contents of the cache will be returned

        At this time , The innkeeper saw that the two martial brothers were so determined , Morality is so noble , He took out the treasure of the town store —— Pandora's box , Give the two martial brothers a chance to go back to the past ！ Back into the store , Have a good night .

        Li Si ge In a hurry ： You want me to experience it again ？？？ I might as well be beaten up by object-oriented programming .

        Zhang San po： If God gives me another chance to go back to the past , I would say ： I am willing to ！！！

• POST Request to step back —— Resubmit the request
• GET Request fallback —— No influence ( cache )

Summary  

http1.0 and http1.1 It's all based on TCP/IP Application layer protocol ,GET Methods and POST Methods are sent at the transport layer tcp Message transmission , There is no difference in essence , But in practice , There will be a difference .

• Set up POST、GET Purpose ： To complete tcp Multiple processing methods are set for transmission message , To deal with different things , Define different methods , Targeted treatment

• POST Data parameters are not visible , The information is filled in Body Partial transmission
• GET The data parameters are visible in the address bar , The data parameters are spliced in URL after （ Insecurity ）
• HTTP The standard is not clearly formulated URL The length of , But general browsers support URL The length is , Therefore use GET The transmission of data will receive URL Length limitation .

• POST The request will not be cached by the browser （ Push agreement ）
• GET The request will be cached by the browser （ Pull agreement ）

• GET Request header and data Send along
• POST The request first sends the request header , Wait for the server to respond , Sending data

• The server needs to get the requested data in a specific way  
• The server processes GET Need to pass through Request.QueryString To get data
• The server processes POST Need to pass through Request.Form To get data

• POST You can modify the resources on the variable server
• GET The requested resource will Actively cached by the browser , Request the same content again , The contents of the cache will be returned

• POST Request to step back —— Resubmit the request
• GET Request fallback —— No influence ( cache )

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