This DotNet Interview Questions and Answers are designed for beginners as well as experienced programmers looking for a change in their job. How to restrict access to methods with specific HTTP verbs in Web API? Answer: System.Web.Http.Results namespace. 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. However, it can be used with ASP.NET Web Form. { return View(); According to research API Testing has a market share of about 16.7%. API (Application Programming Interface) helps in communication and data exchange between two software systems.API act as an interface between two applications and allows the two software systems communicate with one another. Q2.Why is Web API required? 49. 65.What is the status code for “Emptry return type” in Web API? routeTemplate: “api/{controller}/{id}”, 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. config.MapHttpAttributeRoutes(); // Other Web API configuration not shown. { 50. The first route can only be selected whenever the “id” segment of the URI is an integer. We will not be storing anything on the server related to the client. In this blog post for WCF interview questions and answers, we will share a complete list of frequently asked questions that could help you in cracking your next interview and get the dream job right away. How to implement Basic Authentication in ASP.Net Web API? Web API (application programming interface) is associated with developing software and applications. /// }. It is easy to restrict access to an ASP.NET Web API method to be called using a particular HTTP method. We have written a lot on Restful Web Services, today we will look into Restful web service interview questions and answers. 1. return NotFound(); List of the most popular frequently asked ASP.Net and Web API interview questions with answers & examples for beginners and experienced professionals. { 59. Web API creates HTTP services that render raw data. Moves common logic to create HTTP responses to separate classes. 1) What is Web API? 15 Rest API Interview Question & Answers . return Task.FromResult(response); Assume we require to serve Web API to be accessible only over secure HTTP example for HTTPS and not over HTTP. 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. 3. { 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 defaults: new { id = RouteParameter.Optional } response.Headers.CacheControl = new CacheControlHeaderValue() Answer: REST is stand for Representational State Transfer. Stay tuned we will update New Dot Net Interview questions with Answers Frequently. Client-Server constraint – Questions 1 [What is REST? Now, you can begin exploring the most important REST API interview questions that we laid out for both the beginners and experienced testers. Support for OData. In this ASP.NET Interview Questions Series, so far we have covered questions related to the core of ASP.NET technology. WCF What is Rest? { 2. 25. Check 15 ASP.NET Web API Interview Questions And Answers (2019 Update) and Land Your Next Six-Figure Job Offer! Message Queuing scenario will be using MSMQ. public class ValuesController : ApiController Exception handling in WebAPI? Q4.Is it right that ASP.NET Web API has replaced WCF? throw new HttpResponseException(HttpStatusCode.NotFound); 31. 2 public ActionResult GetStudent(int id) Above method not getting access from browser, 81. Can we apply constraints at route level ? { Some other type : Write a serialized return value, public HttpResponseMessage GetData() 2. 26. 22. 27. { Example : } It is a bit more complex and configuration can be a headache to use WCF to create REST services. Answer: The main disadvantage of this approach is that we will not directly return an error code such as 404 error. Answer: Following are the rules followed by WebAPI before binding parameters –. Peoples are using iPhone, mobile, tablets etc. HTTP (HyperText Transfer Protocol) manages the request-response between client and server. Question2: What is REST? Answer: No, We won’t lose any information, data and other parameters if we accidentally exit the Docker container. 4 } 7. Answer: Using ASP.NET Web API has following advantages : 6 }. 4. How parmeters gets the value in WebAPI ? Answer: No. Approach1: 3.A replacement of SOAP. • HttpPost config.Formatters.Remove(config.Formatters.XmlFormatter); • WebAPI will be used to develop HTTP services.Other applications call the WebAPI methods to fetch the data. { HttpError HttpResponseMessage How to secure an ASP.Net Web API? }eval(ez_write_tag([[580,400],'careerkaizen_com-large-mobile-banner-1','ezslot_1',116,'0','0'])); return StatusCode(HttpStatusCode.NoContent); How do you construct HtmlResponseMessage? Answer: Bearer authentication is also called as Token-based authentication. It is a framework that will help us for building/developing HTTP services Attribute-based routing In fact, it is another way of building non-SOAP based services, i.e., plain XML or JSON string. 62. 1. What are the default media types supported by Web API? 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: Following classes will help to handle the exception in ASP.Net Web API. As we will see the GetEmployee method is decorated with the [HttpGet] attribute.We will use different verbs to map the different HTTP requests: 3. Answer: Web API is the Microsoft open source technology to develop REST services which is based on HTTP protocol. As it is bundled with ASP.NET MVC framework. We will mix WEB API and MVC controller in a single project for handling advanced AJAX requests which will return data in JSON, XML or any others format and building a full-blown HTTP service. GET vs POST is one of the most asked questions in an ASP.Net interview. This is for determining the media type formatter for returning the response to an incoming request. } Download PDF. Which protocol is supported by WebAPI? How to mention Roles and users using Authorize attribute in Web API? When a request can be issued from a tool such as a fiddler the Accept header value will be be respected. 4. REST represents REpresentational State Transfer; it is a relatively new aspect of writing web API. name: “myroute”, We hope these Dot Net Interview Questions and answers are useful and will help you to get the best job in the networking industry. Create a class and inherit which class with AuthorizationFilterAttribute and then check if the requested url has HTTPS or not. Answer: Routing is pattern matching such as in MVC. if we required to apply any filter to entire application , register the filter in WebAPI confil file, using Exception hadlers and Exception loogers aslo can handle the Exceptions, 80. 3. 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. 33. When do we need to choose Web API? Similarly PUT method will require primitive data type example for id and complex parameter i.e. {. 47. Answer: The HttpResponseException most common exception in WebAPI. Question3: Can we do unit test Web API? 2. No, we can’t return a view from ASP.NET Web API Method. Answer: We will not return view from Web API. • Custom type Any custom type.WebAPI uses different Media formatters to serialize custom type. }; 60. 61. 5 if (stud != null) Name: “SampleWebAPIRoute”, Explain oData with ASP.Net Web API. }; [Authorize(Roles=”Administrators”)] Register Formatter: For this reason, we have given a complete set of frequently asked API interview questions answer in this blog. }; 4. Almost every new application uses API framework in these days. How to enable Attribute routing ? }, // Restrict by Role 3 routeTemplate: “api/{controller}/{id}”, Find the list below:- Find the list below:- Subscribe to our blog and get the latest posts delivered right to your inbox. REST architectural pattern can 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. • IHttpActionResult This acts as the factory for creating HttpResponseMessage. [EnableCors(origins: “”, headers: “*”, methods: “*”)]. } Attribute programming plays a important role. This states ASP.NET Web API to use JsonFormatter when a request will be made for text/html which is the default for most browsers. 1. Follow me @kansiris87 for technical updates. 1. void – this type returns will empty content (Status Code :204) Save my name, email, and website in this browser for the next time I comment. ASP.Net Web API will support OData V3 and V4. 11 else { 48. 75. 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 … No probs! REST is an architectural pattern to exchange the data over a distributed environment. 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. “CreateErrorResponse” method is can also use along with this, which is an extension method defined in “HttpRequestMessageExtension.”. Find the list below: Find the list below:- Subscribe to our blog and get the latest posts delivered right to your inbox. Here is a List of essential ASP.NET Core Web API Interview Questions and Answers for Freshers and mid level of Experienced Professionals. What is Token Based Authentication in Web API? we will handle the exceptions at action method level or controller level using exception filters. Complete support for routing Answer: A A Web API controller action will return any of the following: Answer: ASP.Net identity is the membership management framework provided by Microsoft which will be easily integrated with Web API. What is the base class of WebAPI controllers? }. Can we do unit test Web API? The following line should be included in Register() method of WebApiConfig.cs file in App_Start folder. }, 18. Although you will have to qualify the interview to get the job and it’s not something you should take granted for. }, [HttpPost] It is a framework that consists of various components of a small software package to interact between the applications or interfaces. It can be performed in three simple steps: Add a routing table to Application_Start method of Global.sax. Q9.How to you can limit Access to Web API to Specific HTTP Verb? return response; In a POST request, we will send binary as well as text data. 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. }. Yes, it will have some added advantages such as utilizing the full features of HTTP and reaching more clients like mobile devices, etc. This list includes … Knowing how to recognize these nuances is what distinguishes a developer who knows JavaScript from a JavaScript developer. TestApi is a utility library of APIs. And that is why we are here to help you prepare for web API interview questions as we have bought you some commonly asked questions during a web API interview. 1. There are a lot of opportunities from many reputed companies in the world. response.Content = new StringContent(“hello”, Encoding.Unicode); We will add Web API Controller and manage to route in Application Start method in Global.asax file. Q13.Which .NET framework supports Web API? It is available in MVC application. WCF requires lots of configuration to run, while Web API is simple and no configuration required to run. With WCF REST Services. [Route(“students/{id:int}”] REST is used to make fewer data transfers between client and server which make it an ideal for using it in mobile apps. different end points. config.Formatters.Remove(config.Formatters.XmlFormatter); 41. Stateless constraint – 1. 3. 3. public IHttpActionResult PostProductMaster(ProductMaster productMaster) Typically, this can be called WEB API self-hosting. SOAP will use interfaces and named operations for exposing the service whereas to expose resources (service) REST will use URI and methods such as GET, PUT, POST, DELETE. public class MyResult : IHttpActionResult Uniform Interface constraint – Your email address will not be published. 82. How to add certificates to website? Self Hosting – Web API will be hosted in Console Application or Windows Service. Fiddler tool of thought be defined in the context of security Driven ) approach in the context of REST. Action can return following values: HttpResponseMessage – this can be used to make their easy! 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