REST (Representational State Transfer) is an architectural style for providing standards between web services and systems. It uses HTTP methods like GET, POST, PUT, DELETE and standard URI for addressing resources. RESTful web services are stateless and typically return payload data in JSON or XML format. Security best practices for RESTful services include session authentication, validating requests, and not passing sensitive data in URLs.

1. REpresentational State Transfer
(REST)
Tanay Sinha

2. Agenda
WEB SERVICES SOAP vs REST
ADVANTAGESHTTPS
HTTP Methods
Resource AugPAYLOAD
RESTFUL WEB
SERVICE

3. A Web Service is can be defined by following ways:
• is a client server application or application component for communication
• method of communication between two devices over network.
• is a collection of standards or protocols for exchanging information between
two devices or application.
About Web Services

4. • There are mainly two types of web services -
TYPES OF WEB SERVICES

5. SOAP
• Stands for simple object access
protocol
• SOAP is a protocol
• SOAP define standard to be strictly
followed
• SOAP can’t use REST because it a
protocol
• SOAP define xml format only
SOAP v/s REST
REST
• REST stands for Representational
State Transfer
• REST is a architectural Style
• REST doesn't define to much
standard like SOAP
• REST can use SOAP web services
because it is a concept and can use
any protocol like HTTP, SOAP.
• REST permits different data format
such as Plain text, HTML, XML,
JSON etc.

6. Restful Web Services
• A web service is a collection of open protocols and standards used for
exchanging data between applications or systems.
• Web services based on REST Architecture are known as RESTful Web
Services
• Rest web services use HTTP methods to implement the concept of REST
architecture. A RESTful web service usually defines a URI (Uniform
Resource Identifier), which is a service that provides resource
representation such as JSON and a set of HTTP Methods.

7. ADDRESSING
• Addressing refers to locating a resource or multiple resources lying on the
server.
• Each resource in REST architecture is identified by its URI (Uniform
Resource Identifier). A URI is of the following format −
• “<protocol>://<service-name>/<ResourceType>/<ResourceID>”
• Purpose of an URI is to locate a resource(s) on the server hosting the web
service.

8. HTTP METHOD
The following HTTP methods are most commonly used in a REST based
architecture.
▪ GET − Provides a read only access to a resource.
▪ POST − Used to create a new resource.
▪ DELETE − Used to remove a resource.
▪ PUT − Used to update an existing resource or create a new resource.

9. GET
• The GET method is used to retrieve information from the given server using
a given URI. Requests using GET should only retrieve data and should have
no other effect on the data.

10. POST
• the POST request method requests that a web server accept the data
enclosed in the body of the request message, most likely for storing it..

11. PUT
• Replaces all current representations of the target resource with the
uploaded content.

12. DELETE
• Removes all current representations of the target resource given by a URI.

13. STATELESSNESS
• RESTful Web Service should not keep a client state on the server. This
restriction is called Statelessness
• It is the responsibility of the client to pass its context to the server and then the
server can store this context to process the client's further request.
• Consider the following URL −
• “http://localhost:8080/UserManagement/rest/UserService/users/1”
• If you hit the above url using your browser or using a java based client or using
Postman, result will always be the User XML whose Id is 1 because the server
does not store any information about the client
• Display the Result in XML format
<user><id>1</id><name>xyz</name></user>
ADVANTAGE OF RESTFUL WEB
SERVICES

14. SECURITY
• As RESTful Web Services work with HTTP URL Paths, it is very important to
safeguard a RESTful Web Service in the same manner as a website is
secured.
• Following are the best practices to be adhered to while designing a RESTful
Web Service −
• Session Based Authentication − Use session based authentication to
authenticate a user whenever a request is made to a Web Service method.
• Validate Malformed XML/JSON − Check for well-formed input passed to a
web service method.
• No Sensitive Data in the URL − Never use username, password or session
token in a URL, these values should be passed to Web Service via the POST
method.
ADVANTAGE OF RESTFUL WEB
SERVICES

15. • The Payload section describes the data the server returns in response to a
request.
• The Payload return the data in JSON , XML or Text.
PAYLOAD

16. • XML Stands for eXtensible Markup Language.
• XML is a markup language much like HTML.
• XML was designed to store and transport data.
• XML uses more words than necessary
▪ Example of XML –
XML

17. • JSON Stands for JavaScript Object Notation.
• JSON is a syntax for Storing and exchanging data.
• JSON files are more human readable than XML.
• Example of JSON format-
JSON

18. Thank you
Thank You
Thankyou
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