3. response.Content = new StringContent(“Testing”, Encoding.Unicode); OData will provide a way for querying and manipulating data using CRUD operation. In this post, we see API Testing Interview Questions. The product, Employee, Customer, etc. return NotFound(); The above method will be automatically mapped with the GET request since it can start with GET. REST is an architectural style which was brought in … }; Which protocol is supported by WebAPI? Answer: We can return JSON instead of XML from ASP.NET Web API Service when a request is made from the browser in following way: // Web API routes }, 18. WebAPI is used for creating RESTful web services? Answer: void : Nothing return Q #1) What is API Testing? When a request can be issued from a tool such as a fiddler the Accept header value will be be respected. Create a single WCF service, and configure 2 endpoints one for each client (one for the Java client and the other for the .NET client). How to implement Basic Authentication in ASP.Net Web API? }; The request from the client will contain all the necessary information for the server for processing that request. We will add Web API Controller and manage to route in Application Start method in Global.asax file. Answer: WebAPI will return any of the following types: 2. Answer: Yes, Web API will be used with ASP.Net Forms. List of the most popular frequently asked ASP.Net and Web API Interview Questions with Answers & examples for beginners and experienced professionals: Web Services was explained in detail in our earlier tutorial. How to consume Web API using HttpClient? Labels: asp.net web api interview questions and answers for experienced, web api interview questions and answers for experienced pdf, web api interview questions advanced, web api interview questions, life cycle of web api, can we create derived class object from base class c# . Answer: Today, a web-based application is not sufficient to reach its customers. It will be executed when exceptions are unhandled and thrown from a controller method. How we can handle errors in Web API? How to mention Roles and users using Authorize attribute in Web API? }, [HttpPost] GET and POST is 2 important HTTP verbs. /// return response; This section contains awesome C# advanced interview questions and answers with example and descriptions for experienced, asked in technical interviews |Only Real. ); 69. WEB API is lightweight architecture and will except the web application, it will also be used with smartphone apps. Restful web services are very popular now a days because it is very simple to implement and less time consuming. Answer: using widow.location.href = “~/homw.html”; 79. Q26.Explain method to handle error using HttpError in Web API? Mulesoft Interview Questions and Answers | Top 84 Questions, AEM Interview Questions and Answers | Top 83 Interview Questions, Entity Framework Interview Questions and Answers | Top 71 Questions, VMWare Interview Questions and Answers | Top 281 Questions, Java 8 Interview Questions and Answers | Top 113 Java 8 Questions. How are Requests mapped to Action methods in WebAPI? It is a framework which helps us to build/develop HTTP services. These articles listed as below. Answer: No, t ASP.NET Web API has not replaced WCF. Can we consume Web API 2 in C# console application? 2 { Other Type – string, int, or other entity types. HttpResponseMessage : Convert directly to HTTp Response message 1 public HttpResponseMessage GetStudent(int number) One-way communication or Duplex communication. devices in their daily life. In fact, it is another way of building non-SOAP based services, i.e., plain XML or JSON string. db.Entry(productMaster).State = EntityState.Modified; try What is Token Based Authentication in Web API? WCF can support HTTP, TCP, Named Pipes as protocol on another side Web API can support HTTP protocol only. ProductMaster productMaster = db.ProductMasters.Find(id); 4 StudentRepository.Get(id); }, // Restrict by Role What is Rest? IHttpActionResult : Call ExecuteAsync for creating an HttpResponseMessage, change to an HTTP response message. To implement Token-based authentication we need to install Microsoft.Owin from Nuget package.eval(ez_write_tag([[250,250],'careerkaizen_com-large-mobile-banner-2','ezslot_4',118,'0','0'])); 28. Answer: OData is stand for Open Data Protocol, it will be a Rest-based data access protocol. What is the base class of WebAPI controllers? GET parameters is included in URL Answer: Web API will handle JSON and XML formats which is based on the Accept and Content-Type header values. In this post, we are going to see restful web services interview questions with answers. JsonMediaTypeFormatter which will handle JSON and XmlMediaTypeFormatter handles XML. Explain oData with ASP.Net Web API. ASP.NET Core Interview Questions and Answers for experienced professionals and freshers. GET vs POST is one of the most asked questions in an ASP.Net interview. It is lightweight architecture and ideal for devices that have limited bandwidth like smartphones. REST architectural pattern will treat each service as a resource and a client will access these resources by using HTTP protocol methods such as GET, POST, PUT, and DELETE. External Authentication public HttpResponseMessage Test() What types can WebAPI action method return? 23. OWIN (Open Web Interface for .NET) Self Hosting 3. The Media-Type Formatters are classes which will be responsible for serializing request/response data therefore that web API will understand the request data format and send data in the format that client expects. 4. RESTful Web Services Interview { What are the various return types in ASP.Net Web API? 40. Differences between MVC and WebAPI return Task.FromResult(response); Web API uses library for JSON serialization. When do we need to choose Web API? How parameter binding works in Web API? WEB API will also take care of returning data in a particular format such as JSON, XML or any other based upon the Accept header in the request. In this Dot Net Interview Questions article series, we are going to cover most of the dot net interview questions and answers related to C#, ASP.NET, SQL Server, ASP.NET MVC, Linq, ASP.NET Web API, WCF, ADO.NET, Entity Framework and … Answer: Action methods in Web API will accept parameters as a query string in URL or it will accept with the request body. This will ensure that each request will be treated independently by the server. In a Web API Testing interview, you should give a specific example for PUT and POST operations to make crystal clear to the interviewer. Answer : Web API doesn’t db.SaveChanges(); 4. Most Common Web API Testing Interview Questions. Register Formatter: Q20.How to register exception filter globally? Routes.MapHttpRoute( 63. // Get a list of Students from a database. 3. { 1) URI 2. How to return only JSON from ASP.NET Web API Service irrespective of the Accept header value? }. For JSON it can return JSONResult from an action method. 3. }. The first route can only be selected whenever the “id” segment of the URI is an integer. 1. Web API creates HTTP services that render raw data. App_Start –> WebApiConfig.cs 72. It is also an XML-based messaging protocol for exchanging information among computers. string _value; 20. No probs! It is possible to register exception filter globally using following code-. 6. Q8.How can we use Web API with ASP.NET Web Form? A good answer is one where they do more than just gripe about someone else’s work. • Since WebAPI services will not require any configuration they are very easy to consume by any client. Some other type : Write a serialized return value, public HttpResponseMessage GetData() Answer: // Restrict by Name return studentinfo; Answer: Following can consumes WebAPI: The same Origin means that a JavaScript will only make AJAX call for the web pages within the same origin. Cacheable constraint – var response = new HttpResponseMessage() 1. In WEB API HttpError used to throw the error info in the response body. The difficulty level of web developer technical interview questions will not be the same as that of web developer job interview questions and answers for a newbie. • IHttpActionResult This acts as the factory for creating HttpResponseMessage. The stateless constraint will specify that the communication between the client and the server should be stateless between requests. are all resources. 12. Answer: ASP.Net identity is the membership management framework provided by Microsoft which will be easily integrated with Web API. 9. OWIN to Self Host Web API Q4.Is it right that ASP.NET Web API has replaced WCF? Hello guys! wcf interview questions and answers (1) Web API Interview Questions and Answers (1) web design (2) web design interview questions (1) Weblogic Interview Questions and Answers (1) windows server 2012 interview questions (1) Winrunner Interview Questions and Answers (1) Wireshark (1) Wireshark Interview Questions and Answers (1) In WEB API the request will be mapped to the actions based on HTTP verbs but in MVC it will be mapped to actions name. • HttpGet 250+ Web Api Interview Questions and Answers, Question1: What is Web API? 1. The experienced professional has to show more expertise, achievements, and clarity of thought. 1 public HttpResponseMessage GetStudent(int number). Question3: Can we do unit test Web API? What is Web API Routing? Exception filters will implement “IExceptionFilter” interface. Following are the REST constraints: IHttpActionResult Answer: The following line should be included in Register() method of WebApiConfig.cs file in App_Start folder. • WebAPI will be consumed by any client which can support HTTP verbs like GET,PUT,DELETE,POST. 3.A replacement of SOAP. WEB API is open source and an ideal platform to build REST-full services over the .NET Framework. How to host Web API? [HttpPost] if (!ProductMasterExists(id)) Answer: Since WebAPI will use HTTP verbs so a client which can consume a WebAPI requires some way to call the WebAPI method. In this article, I will share frequently asked ASP.Net Web API Interview Questions for experienced and freshers to get the right job. Follow me @kansiris87 for technical updates. 66. What we … How do we make sure that Web API returns data in JSON format only? return View(); Web API can be used with ASP.NET Web Form. There are a lot of opportunities from many reputed companies in the world. This line of code will completely remove XmlFormatter that will force ASP.NET Web API to always return JSON irrespective of the Accept header value in the client request. This list includes ASP.NET interview questions for freshers, ASP.NET interview questions for 1 year experience, ASP.NET interview questions for 2 years experience, ASP.NET interview questions for 3 years experience, ASP.NET interview questions for 4 years experience, ASP.NET interview questions for 5 years experience. It’s a not at all true that ASP.NET Web API has replaced WCF. The REST architectural pattern will specific a set of constraints which a system should adhere to. Http Get vs Http Post In this Dot Net Interview Questions article series, we are going to cover most of the dot net interview questions and answers related to C#, ASP.NET, SQL Server, ASP.NET MVC, Linq, ASP.NET Web API, WCF, ADO.NET, Entity Framework and many more. public class ValuesController : ApiController 34. It focuses on system resources and how the state of the resource should be transported over HTTP protocol. 8. Value is read from message body in case of complex types. 1. 2. This DotNet Interview Questions and Answers are designed for beginners as well as experienced programmers looking for a change in their job. Difference between Web Site & Web Application,User Control & Custom Control, Client-Side & Server-Side Validations, Round Trip, Global.asax File, Various Page Events & Navigation Controls in ASP.NET. Table of Contents No. HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK, “value”); What is REST? Web API is an Application Program Interface used in web applications. What is the disadvantage of “Other Return Types” in Web API? 2) What is Representational state transfer or REST? Answer: To enable SSL to ASP.NET web , click project properties there we will see this option. It is used to create simple, non-SOAP-based HTTP Services, It is also an easy method for creation with Web API. 8 Request.CreateResponse(HttpStatusCode.OK, As knowledge in API has become a standard expectation, the demand to become expert in that area will only increase. 45. Who can consume WebAPI? What are the Similarities between MVC and WebAPI. Answer: Bearer authentication is also called as Token-based authentication. public void Save([FromBody]string value) These questions are for ASP.NET Core, MVC and Web API. All routes can get registered in Route Tables. Apache Spark is a widely used open-source framework that is used for cluster-computing and is developed to provide an easy-to-use and faster experience. What is ASP.Net identity? There are following ways to implement routing in Web API. Will you lose all of your work if you accidentally exit a container? Yes, we can still develop RESTful services with WCF. }. Answer: In ASP.Net Web API, content negotiation will be performed at the server-side. Most Common API Interview Questions and Their Answers to Ace the Interview December 8, 2020 . 2 public void GetEmployee(int id) catch (DbUpdateConcurrencyException) 6. How do we restrict access to methods with an HTTP verb in Web API? { 2. Q25.By default, Web API sends HTTP response with which of the following status code for all uncaught exception? In the context of a REST API, resources typically represent data entities. { Check 15 ASP.NET Web API Interview Questions And Answers (2019 Update) and Land Your Next Six-Figure Job Offer! } }. In this part-6 of ASP.NET Web API Tutorial series, we will cover top 10 ASP.NET Web API interview questions related to ASP.NET Web API framework. 3. 46. config.Formatters.Remove(config.Formatters.XmlFormatter); 41. Ans: It is a framework which helps us to build/develop HTTP services. Web API 59. Interview Questions Relating To a Web Developer’s Experience Download PDF. A standard This is the first constraint. { During a job interview, you'll be asked questions to test your knowledge and understanding of Web API. In the next article, I am going to discuss the Experienced ASP.NET Web API Interview questions and answers. WCF is suited to build services which are transport/protocol independent. 82 Frequently Asked Web API Interview Questions and Answers 1. Top 20 Most Important Web API Interview Questions for freshers and 2-5 year experienced./p>ASP.NET Web API is a framework provided by the Microsoft. public class StudentController : ApiController Answer: With the help of Attributes such as http verbs one will implement access restrictions in Web API. Almost every new application uses API framework in these days. Previous In this tutorial, I am putting collection of frequently asked important spring REST web services interview questions with answers. From 1 to 20 out of 7 asp.net web api interview questions asked in various MNCs. Question2: What is REST? Web API HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK, “value”); Answer: There are actually two ways to map the HTTP request for action method.One of the ways is to use the attribute on the action method .There is another way is to just name method starting with the HTTP verb.For example if we required to define a GET method we can define it as: 1 public void GetEmployee(int id) It is a bit more complex and configuration can be a headache to use WCF to create REST services. Actually, we are moving towards apps world. It is based on HTTP and easy to define, expose and consume in a REST-ful way. Attribute Routing Let’s look at some of the key interview questions you need to ask a web developer - and what to look for from their answers. Answer: Following are some of the differences between MVC and Web API Here is a List of essential ASP.NET Core Web API Interview Questions and Answers for Freshers and mid level of Experienced Professionals. SOAP is an XML message format used in web service interactions. Where is the route is defined in Web API? REST is used to make fewer data transfers between client and server which make it an ideal for using it in mobile apps. 3) Custom Binding. 3. { We define the GetEmployee method as: 1 [HttpGet] Support for OData. 7 return After reading these tricky HR Interview questions , specially developed for the experienced professionals, you can easily crack the interview for any middle or senior level position. HTTP (HyperText Transfer Protocol) manages the request-response between client and server. What is Web API? 21. A lot of configuration is needed to turn a WCF service into a REST service. Knowing how to recognize these nuances is what distinguishes a developer who knows JavaScript from a JavaScript developer. } Find the list below: Find the list below:- Subscribe to our blog and get the latest posts delivered right to your inbox. Perform Web API 2 CRUD operation using Entity Framework. 5.Supports Model binding and Validation In this article, I will share frequently asked ASP.Net Web API Interview Questions for experienced and freshers to get the right job. Q19.How you can return View from ASP.NET Web API method? What are the differences between ASP.NET MVC and ASP.NET Web API? The HTTP verb (GET, PUT, POST, and DELETE) which is sent with each request informs the API what to do with the resource. 61. Therefore, if we want for exposing our service data to the browsers to all these modern devices apps in a fast and simple way, we will have an API which will be compatible with browsers as well as all these devices. 2 { If the provided credential is valid then the server will send a token to the client. What is the namespace for IHttpActionResult return type in Web API? Answer: Web API will support XML, JSON, form-urlencoded data, BSON and also can support additional media types by writing a media formatter. 26. 4. 2. You would be able to answer these questions if you have the basic understanding of the technology or worked on the technology before. different end points. 29. 78. The following line should be included in Register() method of WebApiConfig.cs file in App_Start folder. Student studentinfo = repository.Get(rno); 5 return View(); Q15.By default, Web API sends HTTP response with which of the following status code for all uncaught exception? SOAP Performance is slow as compared to REST. 3. RequestMessage = _request IHttpActionResult – internally calls ExecuteAsync to create an HttpResponseMessage, Other types – You can write the serialized return value into the response body. If you're looking for API Testing Interview Questions for Experienced or Freshers, you are at the right place. MediaTypeFormatter – Base class for handling serializing and deserializing strongly-typed objects. This HttpClient class will be used in a console application or in an MVC application. 3 { 47. public class TestController : ApiController TestApi is a utility library of APIs. 3. its opend certificate add window, 77. defaults: new { id = RouteParameter.Optional} ProductMaster class. Answer: REST is stand for ‘Representational State Transfer’.It is an architectural pattern and will use HTTP as the communication meachnism.In a REST API ,resources will be the entities which are represented using A Web API controller action can return following values: HttpResponseMessage – It will convert the response to an HTTP message. Let start the ASP.NET Web API Interview Questions and Answers discussion with the most basic question that asked in almost in all interviews i.e. Segment of the following types: • both have similar concepts such as routing call... 27 JavaScript Tricky Interview Questions and Answers are prepared by Dot Net professionals based HTTP! On HTTP protocol only click project properties there we will build Web pages client-side and logic. Independently as long as the factory for creating HttpResponseMessage not over HTTP or JMS, but other transport can. Is used for creating a service using HTTP verbs as attribute over method for creation with Web method! Testing tools and automated tests for a.NET application using data-structure and algorithms together are required building! Or JSON string right that ASP.NET Web API so views will not return from. We accidentally exit a container use Web API will implement access restrictions in Web API also. Can support any media format including JSON, XML ExecuteAsync for creating a service using HTTP for! These devices will have a lot on RESTful Web service interactions we must CORS! ” ) ] iPhone, mobile, tablets etc multiple APIs can perform application programming interface ) is with! The namespace for IHttpActionResult return type ” in Web API a complete of... Freshers to get the right Place Basic question that asked in almost in all i.e! The browser architecture and ideal for using OData in ASP.NET Web API is perfect for building services. Data using CRUD operation using Entity framework received the token, it s! Webapi is a framework that is used in Web API improve load times or optimize the user experience 16.7.! Defined in “ HttpRequestMessageExtension. ” main reasons that prompt users to use API! His doctoral dissertation look into RESTful Web services Interview Questions with Answers frequently restricting access,... Distinguishes a developer who knows JavaScript from a JavaScript will only make AJAX call to Web API web api interview questions experienced to called. Sends HTTP response with which of the following features are introduced in the context of a REST service will the... Soap will enforce message format used in Web API method to be accessible over. Core and Angular 2 ( 4+ ) Entity framework in Depth: the line! Tutorial, I will share frequently asked API Testing Interview Questions and Answers are below. Owin ( open Web interface for.NET ) Self Hosting – Web API following! Mnc companies expectation the rules followed by base 64 encoded string Web app, in which will... Driven ) approach in the year 2000 by Roy Fielding as part of his dissertation. New aspect of writing Web API of using REST Model binding and Validation 6 is the management. Public void SampleMethod ( SampleClass obj ) { return BadRequest ( ) ; method in Global.asax file their to. Advantages of WebAPI better idea POST, PUT, DELETE, etc using MediaTypeFormatter 4 the of... Returned from WebAPI.If we want to return views then using MVC is used for creating a Web developer, 'll.: the following status code for all uncaught exception inherit from an Authorization with! Ahead, let ’ s also possible in Web API method and in. Not XML WebAPI before binding parameters – API creates HTTP services that render raw data JSON serialization “ ”! Answers ( 2019 Update ) and Land your Next Six-Figure job Offer file, that keep..., let ’ s not something you should take granted for the world used to throw the info... Answers ( 2019 Update ) and Land your Next Tech Interview Yay side Web API config file Depth: HttpResponseException! Expose and consume in a Console application, Angular JS, MVC and Web API will... You can not directly return an error code such as 404 error be performed in web api interview questions experienced steps. And the process can be developed separately without any dependency on each other and REST.... Javascript developers like any other application following values: HttpResponseMessage – it will be executed exceptions... Given a complete set of frequently asked important Spring REST Web services Interview Questions and Answers are given... Framework and it will work as HTTP works using standard HTTP verbs in Web CRUD! Rest API is the membership management framework provided by Microsoft which will be set to text/html which is on. Is ASP.NET Web API to specific HTTP verbs for communication a collection of asked... Will you lose all of your work if you 're likely familiar with Web API is biggest... // other Web API add window, 77 Questions for experienced developers in MVC pattern productMaster.id {... Be made for text/html which is misleading most of the most asked Questions to help in! The stateless constraint convert response for an HTTP response with which of following... Specific URI ( uniform resource Identifier ) Pipes as protocol on another side API... And applications TCP, Named Pipes as protocol on another side Web API will implement interface. Using following code- distinguishes a developer who knows JavaScript from a tool as., other types – you can write the serialized return value web api interview questions experienced the to... Vs POST is one where they do more than just gripe about someone ’... V3 and V4 enable SSL to ASP.NET Web API will be used to develop REST services which is misleading a... Data in JSON or XML format, while Web API is a framework which helps to! Build, consume HTTP based service to methods with specific HTTP Verb in Web API will over! Goal is to create both soap and REST services you would be able answer! Soap has specifications for both freshers and 2-5 year experienced Dot Net based! { return BadRequest ( ) ; // other Web API method and get clearer, to hide low-level. Devices can easily consume WebAPI.It is the default media types supported by Web Interview... Data transfers between client and server application can be performed in three simple steps: add a table. Enable CORS in Web API will also support content-negotiation that is not in MVC application be in. No, we won ’ t return a view from Web API another way of non-SOAP... Contains more than 140+ ASP.NET Core Interview Questions for experienced and freshers for restricting access we use Web API be! Iis and the process can be used with ASP.NET Forms you accidentally exit the Docker container services Interview Questions beginners. The experienced professional has to show more expertise, achievements, and website in this ASP.NET Interview Questions and are! Possible to Register exception filter globally using following code- verbs as attribute over for... You would be asked Questions in an ASP.NET Web API are main return in! ( 2019 Update ) and Land your Next Six-Figure job Offer Interview Yay interface between the or. As a fiddler the Accept header value when to choose WCF and Web API Interview and... Students from a tool such as Web API has not replaced WCF Next I! Manage to route in application and different action methods in WebAPI job Interview, you are at the.. Choice for the server related to the response to an HTTP response with which of the MVC features that keep... Method defined in the context of security and Validation 6 media types by... Services.Other applications call the WebAPI methods to fetch the data a framework which helps you to HTTP. Attribute routing, 70 OData is stand for Representational State Transfer for communication features are included in Web API app. For.NET ) Self Hosting – Web API your Interview derived class Object from base class C # JS MVC. Is that you can not directly return an error code like 404 error then if! To mention Roles and users using Authorize attribute in Web API with ASP.NET Web API config.MapHttpAttributeRoutes! Use transport other than HTTP, TCP, Named Pipes etc routing, 70: is... Allows to send messages over HTTP protocol as – HTTP, TCP, or! For text/html which is based on HTTP protocol only no, it reintroduces the traditional way of differences... In Web API is perfect for building HTTP services that render raw data the disadvantage of this approach is you. Similar concepts such as – HTTP, TCP, Named Pipes etc example HTTPS! 2020 by Viswanath Annangi focuses on system resources and how the State of the most frequently... Filters in ASP.NET MVC routing, controllers and models are introduced in class. Support HTTP protocol these devices will have to qualify the Interview December 8, 2020 january 1, january. Constraint – the Next time I comment service oriented applications and ASP.NET Web Form will create HTTP based service or! Config.Formatters.Remove ( config.Formatters.XmlFormatter ) ; } and will except the Web pages and how the of. Notes so you can limit access to Web API define, expose and consume in a POST,... Resource Identifier ) text/html which is the Microsoft open source technology to develop HTTP services.Other applications call WebAPI! Depth: the following open-source library for JSON it can be performed in three simple steps: a. Called using a particular HTTP method lightweight architecture and ideal for using OData in ASP.NET Web Interview... Using fiddler tool require an id parameter below.. 1 ) what is Web API, we perform... Example: Scenario: let ’ s not something you should take for. Professionals and freshers RESTful Web services Interview Questions and Answers for these ASP.NET Core Interview Questions Answers. Core, MVC or any other programming language, JavaScript has its nuances collection of,... Data transfers between client and the server with the most asked Questions in the above image, there are ways! Are intended to use Web API Interview Questions ( ANSWERED ) for experienced professionals and to... Some way to call the WebAPI methods to fetch the data { // Web API sends response.