• This programming language is especially useful when you are making a simple non-SOAP-based HTTP Service.
• Web API makes creating applications extremely easy with WCF REST Services
• It is based on HTTP and exposed, define and consume in a RESTful way.
• It’s lightweight, ideal for devices with limited bandwidth, such as smartphones.

• OData
• Model Bindings
• Content Negotiation
• Self-Hosting
• Filters
• Routing

• Void – It will return empty.
• HttpResponseMessage – The response will be converted into an HTTP message.
• IHttpActionResult – Internally, the request object makes a call to ExecuteAsync to create an HttpResponseMessage object.
• Other types – You may put the serialized return value into the response body

public class TestController : ApiController

{

public HttpResponseMessage Get()

{

HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK, "value");

response.Content = new StringContent("Testing", Encoding.Unicode);

response.Headers.CacheControl = new CacheControlHeaderValue()

{

MaxAge = TimeSpan.FromMinutes(20)

};

return response;

}

}

It is pattern matching exactly as in MVC. All routes are defined in Route Tables.
For example:
Routes.MapHttpRoute(

Name: "ExampleWebAPIRoute",

routeTemplate: “api/{controller}/{id}

defaults: new { id = RouteParameter.Optional}

1. Create an API controller,
2. Add a routing table to the Application_Start method of Global.asax
3. Then you should make a jQuery AJAX call to the Web API method and receive the data.

By using “ActionName” attribute we can give alias name for Web API action:

[HttpPost]

[ActionName("SaveStudentInfo")]

public void UpdateStudent(Student aStudent)

{

StudentRepository.AddStudent(aStudent);

}

It is basically a utility library of API. Using this library, tester developers can create test tools and automated tests for a wide variety of .Net applications utilizing data structure and algorithms.

Know the Interview Criteria of these MNCs!!!

• Google Interview Preparation Guide
• Amazon Interview Preparation Guide
• Accenture Interview Preparation Guide
• Capgemini Interview Preparation Guide
• Cognizant Interview Preparation Guide

Web API Interview Questions and Answers

By using the following code:

[NotImplExceptionFilter]

public TestCustomer GetMyTestCustomer(int custid)

{

//write the code

}

It is possible to define exception filters globally using the following code:

GlobalConfiguration.Configuration.Filters.Add(new

MyTestCustomerStore.NotImplExceptionFilterAttribute());

REST (Representational State Transfer) is an approach to freshly write a web app.

RESTFUL: It is a procedure of applying REST architectural concepts. It pays attention on system resources and its state that need to be transported over HTTP protocol

Config.Routes.MapHttpRoute(

name: "MyRoute,"//route name

routeTemplate: "api/{controller}/{action}/{id}",//as you can see "API" is at the beginning.

defaults: new { id = RouteParameter.Optional }

);

• Attribute Routing
• Cross-Origin Resource Sharing
• External Authentication
• Open Web Interface NET
• HttpActionResult
• Web API OData

You can use different Attributes (like HTTP verbs) in your Web API controller methods.

A web server can be defined to restrict access based on HTTP verbs.

Example:

[HttpPost]

public void Method1(Class obj)

{

//logic

ArrayList paramList = new ArrayList();

Category c = new Category { CategoryId = 1, CategoryName =“MobilePhones”};

Product p = new Product { Productcode = 1, Name = “MotoG”, Price = 15500, CategoryID = 1 };

paramList.Add(c);

paramList.Add(p);

• Jersey API
• CFX
• Axis
• Restlet

You can use web-based testing tools like Fiddler.

There are things that should be done if you’re going to use Fiddler.

Fiddler –Compose Tab -> Enter Request Headers -> Enter the Request Body and execute

string message = string.Format(“TestCustomer id = {0} not found”, customerid);

return Request.CreateErrorResponse(HttpStatusCode.NotFound, message);

MVC (Model View Controller) is a software design pattern for writing graphical UIs. Views are used for constructing user interfaces.

The Web API is a set of programming interfaces for creating HTTP services so it is utilized for creating web services.