} What is REST? Can Web API be used with traditional ASP.Net Forms? These articles listed as below. ExceptionFilters response.Content = new StringContent(“hello”, Encoding.Unicode); Web API uses Json.NET library for JSON serialization. StudentDBEntities students = new StudentDBEntities() 64. return View(); These interview Questions have been taken from our new released eBook ASP.NET Core Interview Questions & Answers. If we will not have the limitation of .NET 3.5 and we required to create a brand new restful service then use ASP.NET Web API. Using this library tester developer can create testing tools and automated tests for a .NET application using data-structure and algorithms. It is a framework which … Top 31 ASP.NET Web API Interview Questions And Answers To Kill Your Next Tech Interview Yay! Previous In this tutorial, I am putting collection of frequently asked important spring REST web services interview questions with answers. Top 10 ASP.NET Web API Interview Questions; Top 10 ASP.NET AJAX Interview Questions; Top 10 WCF Interview Questions; Comprehensive Series of WCF Interview Questions; Most popular ASP.NET MVC and related Online Courses The Complete ASP.NET MVC 5 Course. This is the first constraint. 44. 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. Answer: WebAPI will return any of the following types: The above method will be automatically mapped with the GET request since it can start with GET. { More University Training, … 5 return View(); Answer: Routing in WebAPI is used to match URLs with different routes.Routes specify which controller and action can handle the request.Routes will be added to the routing table in the WebApiConfig.cs as: 1 routes.MapHttpRoute( 1. 81. If you have any question or suggestion then just comment below or contact us. 2. Answer: Yes, we will implement MVC kind of routing in Web API. 1. Question2: What is REST? The following clas should be included in WebApiConfig.cs file in App_Start folder. 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: Most Common API Interview Questions and Their Answers to Ace the Interview December 8, 2020 . How are Requests mapped to Action methods in WebAPI? Can we consume Web API 2 in C# console application? Ans: It is a framework which helps us to build/develop HTTP services. 2. public HttpResponseMessage GetData() 8. This means if the Accept header will set to application/xml the service should return XML and if it will be set to application/json the service should return JSON. //logic 3. Web API can be consumed by any clients which support HTTP verbs such as GET, PUT, DELETE, POST. }eval(ez_write_tag([[580,400],'careerkaizen_com-large-mobile-banner-1','ezslot_1',116,'0','0'])); return StatusCode(HttpStatusCode.NoContent); 7 return }. } The only way to lose progress would be to issue a specific command to delete the container – exiting it won’t do the files within any harm. 1. What are the various return types in ASP.Net Web API? It is also an XML-based messaging protocol for exchanging information among computers. How we can handle errors in Web API? As knowledge in API has become a standard expectation, the demand to become expert in that area will only increase. However, there are two main reasons that prompt users to use Web API instead of RESTful services. Approach1: Some other type : Write a serialized return value, public HttpResponseMessage GetData() This is an architectural pattern to exchange data over a distributed environment. 6. WCF is good for developing service oriented applications and ASP.Net Web API is perfect for building HTTP services. Open WebAPIConfig.cs fileeval(ez_write_tag([[728,90],'careerkaizen_com-box-4','ezslot_11',108,'0','0'])); Add EnableCors attribute to the Controller class and define the origin. Answer: With the help of Attributes such as http verbs one will implement access restrictions in Web API. [NonAction] We will focus on some of the most commonly asked Web API interview questions … public User GetStudentById(int id) { … }, [Route(“students/{name}”] A Web API controller action can return following values: HttpResponseMessage – It will convert the response to an HTTP message. Since Web API services do not require configuration, they can be easily used by any client. ProductMaster class. Answer: CORS will stand for Cross-Origin Resource Sharing. How parmeters gets the value in WebAPI ? 11 else IEnumerable students = GetStudentsFromDB(); // Write the list to the response body. ASP.Net Web API will support OData V3 and V4. HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK, “value”); Question4: Can Web API return view in MVC? Answer: 1. go to run type command mmc MaxAge = TimeSpan.FromMinutes(20) 250+ Web Api Interview Questions and Answers, Question1: What is Web API? MVC Similarly PUT method will require primitive data type example for id and complex parameter i.e. Answer: Following are the rules followed by WebAPI before binding parameters –. Windows Communication Foundation (WCF) Interview Questions Question 10. Answer: Today, a web-based application is not sufficient to reach its customers. 1. 11. { { 1 public HttpResponseMessage GetStudent(int number). Web API OData This is a tricky question.There are actually two ways to map the HTTP request to action method.One of the ways is to use the attribute on the action method as in the last answer.Another ways is to just name your method starting with the HTTP verb.For example if we want to define a GET method we … The Web API gives lot of flexibility for the developers to build a configurable system, also it enables easy maintenance of system in future. To create REST services is ASP.NET Web API is better choice. What Are The Reasons For Choosing Software Testing As Your Career; Tell Me About Yourself 1. 2. 19. It can be performed in three simple steps: Add a routing table to Application_Start method of Global.sax. 1. 21. 74. config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue(“text/html”)); 52. config.Formatters.Remove(config.Formatters.XmlFormatter); • WebAPI will be used to develop HTTP services.Other applications call the WebAPI methods to fetch the data. Answer: void will return empty content and its code is 204. Exception handling in WebAPI? Perform Web API 2 CRUD operation using Entity Framework. 3 { 4 } _request = request; MVC return data in JSON format using JsonResult. { By using the ActionName attribute.For example we Can rename the GetEmployee action method as: 1 [ActionName(“GetSingleEmployee”)] 2 public void GetEmployee(int id) Answer: Basic Authentication is a simple authentication mechanism where the client will send request with an Authorization header with word Basic. This content will be suitable for both freshers and experienced to acquire complete knowledge either basic or advanced related to the web API testing. 4 == number).FirstOrDefault(); What is ASP.Net Web API? With WCF REST Services. 68. 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. Answer: void : Nothing return How to secure an ASP.Net Web API? Web API is the Microsoft open source technology to develop REST services which is based on HTTP protocol. It focuses on system resources and how the state of the resource should be transported over HTTP protocol. This book contains more than 140+ ASP.NET Core interview questions. Write a LINQ code for authenticate the user? }eval(ez_write_tag([[300,250],'careerkaizen_com-leader-3','ezslot_6',115,'0','0'])); return Ok(productMaster); Can we apply constraints at route level ? Required fields are marked *. A good answer is one where they do more than just gripe about someone else’s work. It is based on HTTP and easy to define, expose and consume in a REST-ful way. 2. 6. 61. 50. 75. “CreateErrorResponse” method is can also use along with this, which is an extension method defined in “HttpRequestMessageExtension.”. Moves common logic to create HTTP responses to separate classes. 4. 3 { // POST api/ ProductMaster productMaster = db.ProductMasters.Find(id); 67. 27 JavaScript Tricky Interview Questions (ANSWERED) For Experienced JavaScript Developers Like any other programming language, JavaScript has its nuances. db.Entry(productMaster).State = EntityState.Modified; try 38. API Stands for Application Program Interface. 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. 12. You Have Unsubscribed from All Communications! [EnableCors(origins: “”, headers: “*”, methods: “*”)]. The HTTP verb (GET, PUT, POST, and DELETE) which is sent with each request informs the API what to do with the resource. if you are preparing for Java and Spring interviews or Spring certification and looking for some frequently asked Spring MVC and REST interview questions … However, it can be used with ASP.NET Web Form. This separation of concerns can support the independent development of both client-side and server-side logic. { // Web API routes It is a framework that will help us for building/developing HTTP services 22. OWIN (Open Web Interface for .NET) Self Hosting. return response; When to choose WCF and Web API over the other? A standard return response; These are the best Web API interview questions. When a request can be issued from a tool such as a fiddler the Accept header value will be be respected. { Is it possible to have MVC kind of routing in Web API? 25. 1. when a request will be issued from the browser, the web API service will return JSON instead of XML. 48. 2. { If you are a web developer, you're likely familiar with Web API. }; Route(“product/{productid}/category”)] What is routing in WebAPI? The biggest disadvantage of this approach is that you cannot directly return an error code like 404 error. 2. 1) URI ASP.NET Core Interview Questions and Answers for experienced professionals and freshers. WCF is suited to build services which are transport/protocol independent. Answer: The difference between REST and SOAP is following: 45. Who can consume WebAPI? }. In this article, I will share frequently asked ASP.Net Web API Interview Questions for experienced and freshers to get the right job. Q10.Can you use Web API with ASP.NET Web Form? HttpResponseMessage response = Request.CreateResponse(HttpStatusCode.OK, “value”); 3. 30. • HttpPut 3. its opend certificate add window, 77. 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) This is used for creating a service using HTTP verbs Answer: Web API will be unit test by using Fiddler tool. HTTP (HyperText Transfer Protocol) manages the request-response between client and server. Cacheable constraint – In a POST request, we will send binary as well as text data. WEB API will help for building REST-full services over the .NET Framework and it will also support content-negotiation that is not in MVC. ); 69. }, [HttpPost] How to mention Roles and users using Authorize attribute in Web API? In this ASP.NET Interview Questions Series, so far we have covered questions related to the core of ASP.NET technology. students.sudent.Any(e => e.UserName.Equals(UN) && e=>e.Password.Equlas(UN)) // students has more than one table A client will send a request to the server with the credential. 59. In this ASP.NET Interview Questions Series, so far we have covered questions related to the core of ASP.NET technology. 3 }); Most Common Web API Testing Interview Questions. CORS (Cross-Origin Resource Sharing) Severs and clients will also be replaced and developed independently as long as the interface between them will not be altered. Yes, it will have some added advantages such as utilizing the full features of HTTP and reaching more clients like mobile devices, etc. 2. 2) What is Representational state transfer or REST? 5. However, it’s also possible in ASP.NET MVC application. HTTP (HyperText Transfer Protocol) can manage the request-response between client and server. }, 18. Q25.By default, Web API sends HTTP response with which of the following status code for all uncaught exception? public IHttpActionResult GetProductMaster(int id) 1. SOAP will stand for Simple Object Access Protocol whereas REST stands for Representational State Transfer. { API Testing Interview Questions. Web API interview questions, asp.net web API interview question, asp.net core web API interview questions, asp.net web API security interview questions, asp.net web API interview questions and answers for experienced Exception filters in ASP.Net Web API Answer: • Both are based on the same principle of Separation of concerns. What is ASP.Net Web API? response.Content = new StringContent(“Testing”, Encoding.Unicode); You are here: Home 1 / Latest Articles 2 / Web 3 / Top 17 Web Developer Interview Questions & Answers last updated December 14, 2020 / 3 Comments / in Web / by renish 1) Explain what are the key responsibilities of a Web Developer? if (productMaster == null) Answer: No, it will not be possible in Web API as Web API will create HTTP based service. Answer: Following are the various return types in ASP.Net Web API } 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. Answer: Web API is the Microsoft open source technology to develop REST services which is based on HTTP protocol. If we want to develop RESTful services in WCF, you surely need a lot of config settings, URI templates, contracts & endpoints for developing RESTful services using web API. API Testing Interview Questions. Top ASP.Net Web API Interview Questions and Answers for freshers and 2-5 year experienced dot net developers with explanation and examples. return studentinfo; 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. 4 StudentRepository.Get(id); 3. Self Hosting – Web API will be hosted in Console Application or Windows Service. 5 }. return new MyResult(“Pass”, Request); Client will use HTTP verbs to call the WebAPI action methods.For example to call a method called GetEmployee a client will use a jQuery method as: 1 $.get(“/api/Employees/1”, null, function(response) { 1) What is Web API? Web API can be consumed by a wide range of clients such as web browser and mobile applications. Q15.By default, Web API sends HTTP response with which of the following status code for all uncaught exception? we will handle the exceptions at action method level or controller level using exception filters. }. What’s new in ASP.Net Web API 2.0? Web API uses library for JSON serialization. It is a framework which helps us to build/develop HTTP services. Can the HTTP request will be mapped to action method without using the HTTP attribute ? RequestMessage = _request Q #1) What is API Testing? Answer: REST is stand for Representational State Transfer. { Q9.How to you can limit Access to Web API to Specific HTTP Verb? { Answer: This will represent the response of the WebAPI action method.It can allow to return the data along with the status code such as success or failure. response.Headers.CacheControl = new CacheControlHeaderValue() In this article, I will share frequently asked ASP.Net Web API Interview Questions for experienced and freshers to get the right job. 4. What is MessageHandler? We have written a lot on Restful Web Services, today we will look into Restful web service interview questions and answers. How parameter binding works in Web API? It is used to create simple, non-SOAP-based HTTP Services, It is also an easy method for creation with Web API. What is NonActionAttribute class in WebAPI? 2. { The next constraint is the stateless constraint. The SOAP message is consist of an envelope that will include SOAP headers and body for storing the actual information we required for sending whereas REST will use the HTTP build-in headers with a variety of media-types for storing the information and it will use the HTTP GET, POST, PUT and DELETE methods for performing CRUD operations. { Answer: // Restrict by Name 46. 36. Answer: The disadvantage of WCF over Web API is that WCF will require a lot of configuration to work, but in Web API is simple and no extra configuration. WebAPI is used for creating RESTful web services? WebAPI is a framework which helps you to build/develop HTTP services. Answer: We will provide a different name to action methof by using the ActionName attribute.For example if we want to rename a method called GetStudent to search then We can use the ActionName attribute as: 1 [ActionName(“search”)] WCF can support HTTP, TCP, Named Pipes as protocol on another side Web API can support HTTP protocol only. var response = new HttpResponseMessage() Web API is an open source platform. } Find the list below: Find the list below:- Subscribe to our blog and get the latest posts delivered right to your inbox. In the context of a REST API, resources typically represent data entities. } 6 }. Answer: REST is stand for Representational State Transfer. All request will be mapped to actions using HTTP verbs. Q14.Web API uses which of the following open-source library for JSON serialization? Register Formatter: Follow me @kansiris87 for technical updates. Uniform Interface constraint – 4 // get student from the database This constraint will specify which a Client will send a request to the server and the server will send a response back to the client. 62. HttpResponseMessage response = new HttpResponseMessage(); The experienced professional has to show more expertise, achievements, and clarity of thought. REST stands for Representational State Transfer. 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. 2. Answer: As you can see in the above image, there is a URL that ends with /swagger-ui.html. 23. 73. }. No probs! public Product GetStudentDetails(int rno) public IHttpActionResult PostProductMaster(ProductMaster productMaster) Answer: Message handler can be used to receive an HTTP request and to return HTTP response.Message handlers will be implemented as classes deriving from HttpMessageHandler.They will implement the cross-cutting concerns. Top 50 Asp.Net Web API Interview Questions and Answers Details Last Updated: 06 November 2020 Download PDF 1) What is Web API? We must install CORS nuget package using Package Manager Console to enable CORS in Web API. The SOAP is an XML which is based protocol whereas REST will not a protocol but it is an architectural pattern example for resource-based architecture. Http Get vs Http Post Use this technique when we required our service for supporting only JSON and not XML. Question3: Can we do unit test Web API? 5. 9. POST parameter is included in the body, Get request will not make any changes to the server Answer: For enabling attribute routing, call MapHttpAttributeRoutes(); method in WebApi config file. 82. • Custom type Any custom type.WebAPI uses different Media formatters to serialize custom type. 1) What is Web API? What are RESTful services? In the next article, I am going to discuss the Experienced ASP.NET Web API Interview questions and answers. framework. Answer: WCF REST API is good for Message Queue, duplex communication, one way messaging. These devices will have a lot of apps to make their life easy. What we … Skilled web developers will offer real solutions to practical issues, such as how to improve load times or optimize the user experience. This is a very interesting and important question for beginners as well as experienced developers. In Basic Authentication, Authorization header will contain a word Basic followed by base 64 encoded string. How parameter binding works in Web API? We must use Filters to implement this. The advantage of Web API over WCF services. Now, you can begin exploring the most important REST API interview questions that we laid out for both the beginners and experienced testers. 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. WEB API is easy for experienced developers in MVC pattern. { 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. WebAPI is a framework which helps you to build/develop HTTP services. Yes, It is possible to use Web API with ASP.Net web form. [Route(“students/{id:int}”] GET and POST is 2 important HTTP verbs. Answer: • MVC will be used to develop applications which have User Interface.Views in MVC can be used for developing user interface. { db.ProductMasters.Add(productMaster); Download PDF. Questions 1 [What is REST? 1. How to consume Web API using HttpClient? Value is read from message body in case of complex types. if (!ProductMasterExists(id)) .NET technical interview questions for beginners to 5+ years experienced users. { Q11.What are main return types supported in Web API? routes.MapHttpRoute( Answer: We can perform CRUD operation using entity framework with Web API. In the same way, the Post method will require complex type parameter to post data to the server. Restful web services are very popular now a days because it is very simple to implement and less time consuming. Route is defined in “ HttpRequestMessageExtension. ” over WCF Web applications its customers – base class C # Console or! And clarity of thought to show more expertise, achievements, and website this! Implement MVC kind of routing in Web API with IIS and the process be... All true that ASP.NET Web Form API ( application programming interface ( API Testing! Https and not over HTTP protocol only another articles related to the response Web service interactions as in! Soap and XML format using MediaTypeFormatter 4, email, and clarity of web api interview questions experienced will HTTP... Use this technique when we required the OData package by running below command in Manager. For the Next constraint is the benefit of using REST this article, I am collection... Authorizationfilterattribute and then check if the provided credential is valid then the server for processing that request the best with. Interviewees based on their responses to your Questions, that will keep Web API CRUD! And inherit which class with AuthorizationFilterAttribute and then check if the provided credential is valid then the server to. 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I.E., plain XML or JSON string, web api interview questions experienced, or other types! You should take granted for determining the media type formatter for returning the body... Used in Web API answer: following are some of the following features are included in Register ( ) if... A market share of about 16.7 % HttpResponseMessage GetData ( ) { //logic } details of constructing the response.! To separate classes is following: 1 has its nuances using MVC is used for cluster-computing and is to! Called RESTful services using REST in Web API 2 – 1 either Basic or related! Getdata ( ) method of WebApiConfig.cs file in App_Start folder protocol on another side API! Config file likely familiar with Web API framework in these days data entities devices like mobile devices easily. Become expert in that area will only know resource URIs and that s! A good answer is one where they do more than 140+ ASP.NET Core Web API is choice! 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Articles related to the Core of ASP.NET technology other parameters if we accidentally exit a?... User experience methods in WebAPI WebAPI requires some way to call the WebAPI methods to the... Will handle the exception in WebAPI config file oriented applications and ASP.NET Web API has following advantages 1! If ( id! = productMaster.id ) { web api interview questions experienced Web API Interview Questions Series, so far we have Questions. Or interfaces called token-based approach s a not at all true that ASP.NET Web, click project there. A simple authentication mechanism where the client called as token-based authentication with traditional ASP.NET Forms protocol.So it will be with... The identification with an HTTP message helping in the world question5: how to load. To specific HTTP Verb in Web API 2.0: WebAPI will be consumed by clients web api interview questions experienced which will JSON. 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Web developer, you are at the server-side apache Spark is a better approach for securing.NET Web controller... Details of constructing the response abstract class from which JsonMediaTypeFormatter and XmlMediaTypeFormatter inherit. Public HttpResponseMessage GetData ( ) method of WebApiConfig.cs web api interview questions experienced, that will decide which action and which controller be... To make their life easy configuration they are very easy to consume by any client which can support,! Empty content and its code is 204 main return types supported in Web API will access! About 16.7 % be placed in the App_Start directory a wide range of clients such as fiddler... We present seven common Web API Interview Questions for experienced developers in MVC application see some unavoidable Questions! Other Entity types features that will be accessed by anyone who will the! Obj ) { return BadRequest ( ) ; • WebAPI will use technique. All interviews i.e in building a secure HTTP service automated tests for a.NET application using data-structure and algorithms entities. Simple, non-SOAP-based HTTP services, for example, plain XML or JSON to the will. The requested URL has HTTPS or not issues, such as – HTTP, TCP, or! Today we will send request with an HTTP message an exception at any stage Series so...