get and post methods
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METHODS GET AND POST
INTRODUCTION
Get and Post are HTTP request methods to transfer data from client to server.
HTTP works as a request-response protocol between a client and server.
Get - Requests data from a specified resource
Post - Submits data to be processed to a specified resource
Both GET and POST can be used to send request and receive response
GET METHOD
GET requests can be cached
The GET method means retrieve whatever information (in the form of an entity) is
identified by the Request-URI.
GET requests remain in the browser history
GET can't be used to send binary data, like images or word documents, to the server.
GET requests can be bookmarked
GET requests should never be used when dealing with sensitive data
GET requests have length restrictions
GET requests should be used only to retrieve data
Eg: http://www.example.com/servlet?foo=bar
POST METHOD
POST requests are never cached
POST requests do not remain in the browser history
POST requests cannot be bookmarked
POST requests have no restrictions on data length
The POST method can be used to send ASCII as well as binary data.
The data sent by POST method goes through HTTP header so security depends on HTTP protocol. By using Secure HTTP you can make sure that your information is secure.
COMPARE GET VS POST
GET POST
BACK button/Reload Harmless Data will be re-submitted (the browser should alert the user that the data are about to be re-submitted)
Bookmarked Can be bookmarked Cannot be bookmarked
Cached Can be cached Not cached
History Parameters remain in browser history
Parameters are not saved in browser history
GET POST
Restrictions on data length
Yes, when sending data, the GET method adds the data to the URL; and the length of a URL is limited (maximum URL length is 2048 characters)
No restrictions
Restrictions on data type Only ASCII characters allowed
No restrictions. Binary data is also allowed
Security GET is less secure compared to POST because data sent is part of the URL
Never use GET when sending passwords or other sensitive information!
POST is a little safer than GET because the parameters are not stored in browser history or in web server logs
Visibility Data is visible to everyone in the URL
Data is not displayed in the URL
CONTINUE. . .
ADVANTAGES OF GET
Save the results of a form submission.
For example, you can submit data and
bookmark the resultant URL, send it to a colleague by email, or put it in a normal hypertext
link. The ability to bookmark the results page is the main reason google.com, yahoo.com, and
other search engines use GET.
Type data in by hand.
You can test Servlets or JSP pages that use GET simply by entering a URL with the appropriate
data attached.
ADVANTAGES OF POST
Transmit large amounts of data. Many browsers limit URLs to a few thousand
characters, making GET inappropriate when your form must send a large amount of data.
Since HTML forms let you upload files from the client machine, sending multiple megabytes
of data is quite commonplace. Only POST can be used for this task.
Send binary data. Spaces, carriage returns, tabs, and many other characters are illegal in
URLs. If you upload a large binary file, it would be a time-consuming process to encode all
the characters before transmission and decode them on the other end.
Keep the data private from someone looking over the user’s shoulder..
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