The SOAP is an XML based protocol whereas REST is not a protocol but it is an architectural pattern i.e. Typically, this will be called WEB API self-hosting. Now when you run this application, you'll see the Authenticate API as well, just invoke this API with Basic Authentication and User credentials, you'll get the token with expiry, let's do this step-by-step. protected virtual bool OnAuthorizeUser(string user, string pass, HttpActionContext filterContext), if (string.IsNullOrEmpty(user) || string.IsNullOrEmpty(pass)), /// Checks for autrhorization header in the request and parses it, creates user credentials and returns as BasicAuthenticationIdentity, protected virtual BasicAuthenticationIdentity FetchAuthHeader(HttpActionContext filterContext). Unlike WCF Rest we can use full features of HTTP in Web API. /// Virtual method.Can be overriden with the custom Authorization. Banking & Finance. Apigee Interview Questions # 10) How do you safeguard the security of your API infrastructure as data is exposed to mobile apps, developers, and partners? This ensures that each request can be treated independently by the server. Web Application Security Interview Questions Long polling is a web application development pattern used to emulate pushing data from the server to the client. This can be saved in database or some external file. 17) How to you can limit Access to Web API to Specific HTTP Verb? Thursday, April 12, 2018. var identity = FetchAuthHeader(filterContext); var genericPrincipal = new GenericPrincipal(identity, null); Thread.CurrentPrincipal = genericPrincipal; if (!OnAuthorizeUser(identity.Name, identity.Password, filterContext)). We can mix WEB API and MVC controller in a single project to handle advanced AJAX requests which may return data in JSON, XML or any others format and building a full-blown HTTP service. Authentication is a technique where user id and password has been passed. This is the first constraint. All requests are mapped to the respective action methods. WebHttpBinding to be enabled for WCF Rest. Answer: API is a collection of routines, tools, protocols that together are required for building the software application. Your email address will not be published. config.Formatters.Remove(config.Formatters.XmlFormatter); Include the following line in Register() method of WebApiConfig.cs file in App_Start folder. 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. List of frequently asked Dot Net Interview Questions with answers by Besant Technologies. Difference between TextBox and TextBoxFor, Dependencies Vs DevDependencies angular 2+. Web API supports HTTP protocol thereby it reintroduces the old way of HTTP verbs for communication. If we are stuck with .NET 3.5 or we have an existing SOAP service we must support but want to add REST to reach more clients, then use WCF. This means if the Accept header is set to application/xml the service should return XML and if it is set to application/json the service should return JSON. Then forward the message to the second layer. config.Formatters.Add(new CustomJsonFormatter()); When a request is issued from the browser, the web API service should return JSON instead of XML. In the next article, i am going to discuss experienced ASP.NET Web API Interview questions with answers. Just apply this filer to ProductController. If we don’t have the limitation of .NET 3.5 and we want to create a brand new restful service then use ASP.NET Web API. Difference Between ASP.NET Web API & WCF, ASP.NET MVC application & ASP.NET Web API application. Severs and clients may also be replaced and developed independently as long as the interface between them is not altered. Inheritance and Interface Interview Questions in C#, Abstract and Sealed Class Interview Questions in C#, Polymorphism Interview Questions and Answers in C#, Partial Class Interview Questions and Answers in C#, Constructor Interview Questions and Answers in C#, Functions Interview Questions and Answers in C#, Properties Interview Questions and Answers in C#, Fields and Constants Interview Questions in C# with Answers, Access Modifiers Interview Questions in C#, Data Types Interview Questions and Answers in C#, String Interview Questions and Answers in C#, Delegate Interview Questions and Answers in C#, Nested Types Interview Questions and Answers in C#, Multi-Threading Interview Questions and Answers in C#, Deadlock Interview Questions and Answers in C#, Exception Handling Interview Questions in C#, ASP.NET MVC Routing Interview Questions and Answers, View Engine and HTML Helpers Interview Questions in ASP.NET MVC, ASP.NET MVC Data Annotations Interview Questions, ASP.NET MVC Filters Interview Questions and Answers, ASP.NET MVC Caching Interview Questions and Answers, SQL Server Temporary Tables Interview Questions, SQL Server Indexes Interview Questions and Answers, SQL Server Triggers Interview Questions and Answers, SQL Server Functions Interview Questions and Answers, SQL Server Constraints Interview Questions and Answers, SQL Server Exception Handling Interview Questions, SQL Server Stored Procedure Interview Questions. Yes, It is possible to use Web API with ASP.Net web form. So here is what we want the service to do. Dynamic Security Tests : Dynamic security tests done by a professional security testing team should be an important part of the release cycle. This constraint specifies that a Client sends a request to the server and the server sends a response back to the client. Here I am providing you a list of web services interview questions to help you in interview. REST stands for Representational State Transfer. REST always used to make fewer data transfers between client and server which makes REST an ideal for using it in mobile apps. Web API Security There are two technique for security in Web API. Using ASP.NET Web API has a number of advantages, but core advantages are: The new features introduced in ASP.NET Web API framework v2.0 are as follows: Below are some of the differences between MVC and Web API. What is Representational state transfer or REST? Most Common Web API Testing Interview Questions. If you are sending user id, password. These are some of the most asked interview questions for REST API interview. Web API can be hosted in IIS or in an application. ASP.NET Web API is a framework that makes it easy to build Web API’s, i.e. WebSockets 24 ... 15 ASP.NET Web API Interview Questions And Answers (2019 Update) ASP.NET Web API 33 . I would like to have your feedback. This line of code completely removes JsonFormatter which forces ASP.NET Web API to always return XML irrespective of the Accept header value in the client request. But how does web API handles these different formats? Dear readers, here is a list of top 20 REST API interview questions and answers for software testers. OWASP ESAPI (Enterprise Security API) is an open source web application security control library that enables developers to build or write lower risk applications. GlobalConfiguration.Configuration.Filters.Add(new ApiAuthenticationFilter()); You can also apply it to Action level too by your wish to apply or not apply authentication to that action. Some data provided by the server like the list of products, or list of departments in a company does not change that often. Here we go. You can add this filter at the top of the controller, for all API requests to be validated, public class ProductController : ApiController. Answer: Web API is the Microsoft open source technology to develop REST services which is based on HTTP protocol. Question2: Explain what are some of your greatest strengths? The uniform interface constraint defines an interface between the client and the server. 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. MVC is used to create web applications that return both views and data but ASP.NET WEB API is used to create rest full HTTP services with the easy and simple way that returns only data, not view. for all CRUD operations, Response generated in JSON or XML format using MediaTypeFormatter, It has the ability to be hosted in IIS as well as self-host outside of IIS, OWIN (Open Web Interface for .NET) Self Hosting. var dnsHost = filterContext.Request.RequestUri.DnsSafeHost; filterContext.Response = filterContext.Request.CreateResponse(HttpStatusCode.Unauthorized); filterContext.Response.Headers.Add("WWW-Authenticate", string.Format("Basic realm=\"{0}\"", dnsHost)); /// Custom Authentication Filter Extending basic Authentication, public class ApiAuthenticationFilter : GenericAuthenticationFilter, /// AuthenticationFilter constructor with isActive parameter, public ApiAuthenticationFilter(bool isActive), /// Protected overriden method for authorizing user, protected override bool OnAuthorizeUser(string username, string password, HttpActionContext actionContext), var provider = actionContext.ControllerContext.Configuration. Moreover, WEB API is lightweight architecture and except the web application, it can also be used with smartphone apps. MVC is used to create a web app, in which we can build web pages. The stateless constraint specifies that the communication between the client and the server must be stateless between requests. I hope you enjoy this ASP.NET Web API Interview Questions and Answers article. Back to: DotNet Interview Questions and Answers. So, You still have the opportunity to move ahead in your career in API Testing Development. Q #1) What is API Testing? Difference Between ASP.NET Web API & WCF, ASP.NET MVC application & ASP.NET Web API application. The next constraint is the stateless constraint. Here we will discuss interview questions and answers on application security testing. Q #1) What is API Testing? Mindmajix offers Advanced API Testing Interview Questions 2018 that helps you in cracking your interview & acquire a dream career as API Testing Developer. Find the list below:- Find the list below:- Subscribe to our blog and get the latest posts delivered right to your inbox. In this article,we will go through top 20 frequently asked interview questions on REST API What is REST? SOAP stands for Simple Object Access Protocol whereas REST stands for Representational State Transfer. .DependencyResolver.GetService(typeof(IUserServices)) as IUserServices; var userId = provider.Authenticate(username, password); var basicAuthenticationIdentity = Thread.CurrentPrincipal.Identity as BasicAuthenticationIdentity; basicAuthenticationIdentity.UserId = userId; There are three ways in which you can use this authentication filter. Most Common API Interview Questions and Their Answers to Ace the Interview December 8, 2020 When applying for an API software engineering job, you will need to demonstrate that you have a firm grasp of API, as well as API testing, SOAP and REST. It is preferable to do this as early as possible. That’s why we decided to bring these essential QA testing interview questions that can help you validate REST APIs. 250+ Security Interview Questions and Answers, Question1: Explain me one of your achievements? All requests are mapped to actions using HTTP verbs. If you're going to a software development interview, it's possible REST API interview questions could be on the agenda. There is nothing wrong to use WCF to create REST services. .Add(new MediaTypeHeaderValue(“text/html”)); config.Formatters.Add(new CustomJsonFormatter()); With these 2 changes, when a request is issued from the browser you will get JSON formatted data and the Content-Type header of the response is also set to application/json. In this article, I am going to discuss the most frequently asked ASP.NET Web API Interview Questions and Answers. REST architectural pattern treats each service as a resource and a client can access these resources by using HTTP protocol methods like GET, POST, PUT, and DELETE. 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. one for the Java client and the other for the .NET client). First of all there are generic questions for web services concept since it’s not technology or language specific and then we have java web services interview questions. REST architectural pattern treats each. What is a Resou… A client should only know resource URIs and that’s all. in plain test inside request header, it is prone to hack (CSRF Cross site request forgery). I hope you enjoy this ASP.NET Web API Interview Questions and Answers article. Web Services Interview Questions. authHeaderValue = Encoding.Default.GetString(Convert.FromBase64String(authHeaderValue)); var credentials = authHeaderValue.Split(':'); return credentials.Length < 2 ? Token can be generated using GUID. SOAP enforces message format as XML whereas REST does not enforce message format as XML or JSON. For JSON it will return JSONResult from an action method. Please post your feedback, question, or comments about this ASP.NET Web API Interview Questions and Answers article. With this change, irrespective of the Accept header value (application/xml or application/json), the Web API service is always going to return XML. The REST was first introduced in the year 2000 by Roy Fielding as part of his doctoral dissertation. 14) Mention what is the basic design of OWASP ESAPI? How we can create SOAP and RESTful web services in Java. Question3: Tell me do you have anger issues? If you are using tools like a fiddler and if you set Accept header to application/xml you will still get XML formatted data. JsonMediaTypeFormatter handles JSON and XmlMediaTypeFormatter handles XML. ASP.NET Web API is a framework that makes it easy to build HTTP services that reach a broad range of clients, including browsers and mobile devices. Here we go. The REST was first introduced in the year 2000 by Roy Fielding as part of his doctoral dissertation. Please post your feedback, question, or comments about this ASP.NET Web API Interview Questions and Answers article. Q1. This tells ASP.NET Web API to use JsonFormatter when a request is made for text/html which is the default for most browsers. ASP.NET Web API is a framework for building HTTP based service, that can communicate using different data format like XML and JSON, Asp.Net Web service can reach to different clients like browsers, mobile, IoT devices, etc. The difference between REST and SOAP is given below: WCF (Windows Communication Foundation) is one of the choices available in .NET for creating both SOAP and REST services. What we … REST represents REpresentational State Transfer; it is a relatively new aspect of writing web API. Your email address will not be published. Security Testing Interview Questions and Answers for Fresher, Experienced, Web Application Security Testing Interview Questions and Answers, cyber Security Interview Questions. Since Web API services do not require configuration, they can be easily used by any client. You can also globally add this in Web API configuration file , so that filter applies to all the controllers and all the actions associated to it. Java client wants the transport protocol to be HTTP and message format to be XML for interoperability, whereas the .NET client expects the protocol to be TCP and the message format to be binary for performance. Q2. Question4: Tell me do you use computers? I would like to have your feedback. In the context of a REST API, resources typically represent data entities. authorization. config.Formatters.Remove(config.Formatters.JsonFormatter); You need to override OnAuthorization function. Software security is not limited to web application security. Ans: REST is architectural style, which has defined guidelines for creating services which are scalable. Here I am providing you a list of web services interview questions to help you in interview. Ans: Ping doesn’t use any port. Use this technique when we want our service to support only JSON and not XML. REST used with HTTP protocol using its verbs GET, POST, PUT and DELETE. The Media-Type Formatters are classes which are responsible for serializing request/response data so that web API can understand the request data format and send data in the format which client expects. REST allows us to use a layered system architecture where we deploy the APIs in server A, and store data on server B and authenticate requests in server C. For example, a client cannot ordinarily tell whether it is connected directly to the server or to an intermediary along the way. What is ASP.NET Web API. After that this token send with each request no need to send credential each time. resource-based architecture. The request from the client should contain all the necessary information for the server to process that request. So the more natural choice for creating REST services is ASP.NET Web API, which is specifically designed for this purpose. Click on the first API link, in other words POST authenticate. devices in their daily life. Your API security should be organized into two layers: The first layer is in DMZ, with an API firewall to execute basic security mechanisms like checking the message size, SQL injections and any security based on the HTTP layer, blocking intruders early. You'll get the page to test the API. WCF is more suited for building services that are transport/protocol independent. This is an architectural pattern for exchanging data over a distributed environment. We can also maintain session using token based atuhorization. In WEB API the request is mapped to the actions based on HTTP verbs but in MVC it is mapped to actions name. RESTFUL is referred for web services written by applying REST architectural concept are called RESTful services, it focuses on system resources and how state of resource should be transported over HTTP protocol to different clients written in different language. API Testing Interview Questions; Business. config.Formatters.Remove(config.Formatters.JsonFormatter); With this change, irrespective of the Accept header value (application/xml or application/json), the Web API service is always going to return XML. If you loved these Questions, you will love our PDF Interview Guide with 400+ Questions. It supports most of the MVC features which keep Web API over WCF. The REST architectural pattern specifies a set of constraints that a system should adhere to. Being a QA engineer, we also need to be aware of the rest API concept. To understand the uniform interface constraint, we need to understand what a resource is and the HTTP verbs – GET, PUT, POST and DELETE. What we need to do here is create a single WCF service, and then configure 2 endpoints one for each client (i.e. This is the case, for APIs at least! Visit the blog for .Net FAQ,.Net interview questions,ASP .Net FAQ, C# .Net FAQ,ASP .Net interview questions, interview question on .Net, interview questions on C#. The SOAP message consists of an envelope which includes SOAP headers and body to store the actual information we want to send whereas REST uses the HTTP build-in headers (with a variety of media-types) to store the information and uses the HTTP GET, POST, PUT and DELETE  methods to perform CRUD operations. Web or Rest API interview questions & answers 1. In this ASP.NET Interview Questions Series, so far we have covered questions related to the core of ASP.NET technology. What is Web API? But WCF is still a good choice for the following scenarios: This Web API Interview Questions are asked almost all Web API Interviews. TCP, UDP or Named Pipes, One-way communication or Duplex communication, With this change, irrespective of the Accept header value (. Web API is actually accessible through HTTP protocol, it doesn't say whether it is accessed by a web browser or an application. REST architectural pattern treats each, If you are preparing for Web API Interviews then definitely you have to prepare this, REST stands for Representational State Transfer. Testing of the Accept and Content-Type header values contains only 0 and 1 POST. ) can you use Web API method to be called using a particular HTTP method between REST! A REST service Microsoft open source technology to develop REST services which is specifically for..., how do you deal with them to you can limit access an... 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