http method: GET contrast POST "JAVA:SPRINGMVC: Basics: HTTP Protocol ()

Http://www.w3school.com.cn/tags/html_ref_httpmethods.asp

The two most common HTTP methods are: GET and POST.

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What is HTTP?

The Hypertext Transfer Protocol (HTTP) is designed to ensure communication between the client and the server.

HTTP works as a request-response protocol between the client and the server.

A Web browser might be a client, and a network application on a computer might be a server-side.

Example: the client (browser) submits an HTTP request to the server, and the server returns a response to the client. The response contains status information about the request and What might be requested .

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Two methods of HTTP request: GET and POST

In the request-response between the client and the server, the two most commonly used methods are: GET and POST.

• GET -requests data from the specified resource.
• POST -submits the data to be processed to the specified resource

GET method

Note that the query string (name/value pair) is sent in the URL of the GET request:

/test/demo_form.asp?name1=value1&name2=value2

Some additional comments about the GET request:

• Get requests can be cached
• GET requests remain in browser history
• Get requests can be bookmark-Favorites
• GET requests should not be used when handling sensitive data
• Get request has a length limit
• GET requests should only be used to retrieve data

POST method

Note that the query string (name/value pair) is sent in the HTTP message body of the POST request:

Post/test/demo_form.asp http/1.1

Host:w3schools.com

Name1=value1&name2=value2

Some additional comments about the POST request:

• POST requests are not cached
• POST requests are not persisted in browser history
• POST cannot be bookmarked
• POST request has no requirement for data length

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Compare GET to POST

The following table compares the two HTTP methods: GET and POST.

Contrast Item surface	GET	POST
Back button/refresh	harmless	data will be resubmitted (the browser should tell the user that the data will be resubmitted).
bookmarks	favorites bookmark	not bookmark
cache	can be cached	cannot be cached
encoding type	application/x-www-form-urlencoded	application/x-www-form-urlencoded or Multipart/form-data. Use multiple encodings for binary data.
history
limitations on data length	Yes. When the data is sent, the GET method adds data to the URL; url is limited (the maximum URL length is 2048 characters) .	unrestricted.
Restrictions on data types	only ASCII characters are allowed.	there is no limit. Binary data is also allowed.
security	never use GET when sending passwords or other sensitive information!	post is more secure than GET because parameters are not saved in the browser history or Web server logs.
Visibility of	The data is visible to everyone in the URL.	The data is not displayed in the URL.

Other HTTP Request Methods

Some other HTTP request methods are listed in the following table:

Method	Describe
HEAD	Same as GET, but returns only the HTTP header and does not return the document body.
PUT	Uploads the specified URI representation.
DELETE	Deletes the specified resource.
OPTIONS	Returns the HTTP methods supported by the server.
CONNECT	Convert the request connection to a transparent TCP/IP channel.

http method: GET contrast POST "JAVA:SPRINGMVC: Basics: HTTP Protocol ()