Rest webservice ppt
- 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
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