[REST] What is REST?
What is REST?
What is REST? REST stands for Representational State Transfer. 
It is a stateless, client-server communication protocol that relies on HTTP protocol. REST was designed to be able to communicate within servers without much complication using the HTTP protocol. The difference with REST protocol is that there is no specific “standard” to be used. REST can be used to create, update, delete and read data from a service which supports REST. Despite being simple, REST is fully-featured; there’s basically nothing you can do in Web Services that can’t be done with a RESTful architecture.
A RESTful service can be broken into main 4 requests.
| GET | read data from a service |
| POST | create data in a service |
| PUT | update data in a service |
| DELETE | delete data from a service |
As discussed earlier REST is a simple, Lightweight, “standard”less protocol. To see how REST is different from another protocol that is used to communicate within servers SOAP protocol can be used.
REST is simple
How is REST simple? when comparing requests sent through REST and SOAP we can clearly see how simple REST actually is.
<soapenv:Envelope xmlns:soapenv="http://schemas.xmlsoap.org/soap/envelope/" xmlns:ser="http://services.samples"> <soapenv:Header/> <soapenv:Body> <ser:getSimpleQuote> <ser:symbol>nu1silva</ser:symbol> </ser:getSimpleQuote> </soapenv:Body> </soapenv:Envelope>
So, REST request will look like;
GET http://nu1silva.com/rest/simplequote/symbol/nu1silva
Its simple as that.
REST is Lightweight
Writing and Testing a REST service can be easily done. As pointed earlier, when compared to testing a service that accepts REST vs SOAP specialized software is not required and you can test it by sending CURL requests or a simple browser client such as Advanced REST Client or Postman.
REST is “Standard”less
REST is standardless. It can be implemented in anyway the anyone wants. When taking to account a simple User Management Application that uses REST to do CRUD (Create, Read, Update and Delete) operations the application can be written to accept input in many different ways. As an example the requirement is to show details of a user with the user ID 1234. The request can be any of the following.
GET http://nu1silva.com/usermanagement/user/1234GET http://nu1silva.com/usermanagement/user=1234GET http://nu1silva.com/usermanagement/user/search/1234GET http://nu1silva.com/usermanagement/user/search/id=1234
Simple REST sample
Explaining REST can be done through a simple user management solution with CRUD operations. as shown above you can use CURL command or any client you require.
Create a user
GET http://nu1silva.com/usermanagement/user/create
Read a users details
GET http://nu1silva.com/usermanagement/user/search/001
Update a user
GET http://nu1silva.com/usermanagement/user/update
Delete a user
GET http://nu1silva.com/usermanagement/user/delete/001
These are sample request that can be used when using REST protocol. As shown above REST is a simple, lightweight, standardless protocol that is heavily used in the modern internet era.