The document discusses the HTTP request methods GET and POST. GET requests retrieve data from a specified resource, while POST submits data to be processed by a specified resource. Both can send requests and receive responses. GET requests can be cached, bookmarked, and have data restrictions. POST requests are never cached, cannot be bookmarked, and have no data restrictions. The document compares the advantages and disadvantages of GET and POST and provides examples of appropriate uses for each.

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3. METHODS GET AND POST

4. 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

5. 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

6. 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.

7. 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

8. 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. . .

9. 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.

10. 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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