The uniform interface constraint defines an interface between the client and the server. If you are sending user id, password. API Testing Interview Questions. WEB API helps to build REST-full services over the .NET Framework and it also supports content-negotiation which is not in MVC. 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. If you are using tools like a fiddler and if you set Accept header to application/xml you will still get XML formatted data. What is ASP.NET Web API. Ans: It is a framework which helps us to build/develop HTTP services. This can be saved in database or some external file. Answer: Web API is the Microsoft open source technology to develop REST services which is based on HTTP protocol. Web API can be hosted in IIS or in an application. Apigee Interview Questions # 10) How do you safeguard the security of your API infrastructure as data is exposed to mobile apps, developers, and partners? HTTP based services on top of the .NET Framework. Here are the REST constraints. Moreover, WEB API is lightweight architecture and except the web application, it can also be used with smartphone apps. in plain test inside request header, it is prone to hack (CSRF Cross site request forgery). The request from the client should contain all the necessary information for the server to process that request. Recently I have written a lot about web services. 1. SOAP Performance is slow as compared to REST. In the context of a REST API, resources typically represent data entities. 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#. Run the application. You'll get the page to test the API. 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. In WEB API the request is mapped to the actions based on HTTP verbs but in MVC it is mapped to actions name. We can also maintain session using token based atuhorization. Thursday, April 12, 2018. How we can create SOAP and RESTful web services in Java. /// Virtual method.Can be overriden with the custom Authorization. If you loved these Questions, you will love our PDF Interview Guide with 400+ Questions. 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. Difference between TextBox and TextBoxFor, Dependencies Vs DevDependencies angular 2+. Welcome to the Web Services Interview Questions with detailed answers. This constraint specifies that a Client sends a request to the server and the server sends a response back to the client. That means client application and server application should be developed separately without any dependency on each other. Unlike WCF Rest we can use full features of HTTP in Web API. Name some of the commonly used HTTP methods used in REST based architecture? Q #1) What is API Testing? I hope you enjoy this ASP.NET Web API Interview Questions and Answers article. Some data provided by the server like the list of products, or list of departments in a company does not change that often. But WCF is still a good choice for the following scenarios: This Web API Interview Questions are asked almost all Web API Interviews. This is used to create a service using HTTP verbs. The problem with this approach is that the Content-Type header of the response is set to text/html which is misleading. . So there will a client server communication using HTTP protocol. … When a request is issued from a tool like a fiddler the Accept header value should be respected. MONTH START OFFER : Flat 15% Off with Free Self Learning Course | Use Coupon MONTH15 COPY CODE This constraint says that let the client know how long this data is good for so that the client does not have to come back to the server for that data over and over again. 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. Technically MediaTypeFormatter is an abstract class from which JsonMediaTypeFormatter and XmlMediaTypeFormatter classes inherit from. It’s a misconception that ASP.NET Web API has replaced WCF. There are two technique for security in Web API. dot net security interview questions with example, .net security interview questions, concepts in security issues, impersonation in ASP.NET This is an architectural pattern for exchanging data over a distributed environment. WEB API Service is highly secure and can communicate asynchronously. 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. 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. If you are preparing for Web API Interviews then definitely you have to prepare this Web API Interview Questions. Since Web API services do not require configuration, they can be easily used by any client. If yes, how do you deal with them? REST stands for Representational State Transfer. Here we go. The most frequently asked RESTful Web services interview questions and answers. WebSockets 24 ... 15 ASP.NET Web API Interview Questions And Answers (2019 Update) ASP.NET Web API 33 . These services can then be consumed by a broad range of clients like. What is Web API? Question5: Tell me how do you know when to enlist external help? The REST was first introduced in the year 2000 by Roy Fielding as part of his doctoral dissertation. Dot Net Interview Questions and answers. When the long polling is used, the client sends a request to the server, and the connection remains intact until the server is ready to send data to the client. For JSON it will return JSONResult from an action method. When a request is issued from the browser, the web API service should return JSON instead of XML. ASP.Net Web API is a framework to build, consume HTTP based service. Web API Security There are two technique for security in Web API. In the next article, i am going to discuss experienced ASP.NET Web API Interview questions with answers. .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. For this scenario, WCF is the right choice. Thursday, April 12, 2018. For example, we want to build a single service that can be consumed by 2 different clients – Let’s say, a Java client and .NET client. Then forward the message to the second layer. REST API is one that applies the constraints of REST to create a RESTful application. It supports most of the MVC features which keep Web API over WCF. devices in their daily life. APIs are the doors too closely guarded data of a company, creating the following challenge: how can we keep the doors open for the ecosystem and sealed off from hackers at the same time?. It is preferable to do this as early as possible. I would like to have your feedback. Each resource is identified by a specific URI (Uniform Resource Identifier). SOAP uses interfaces and named operations to expose the service whereas to expose resources (service) REST uses URI and methods like (GET, PUT, POST, DELETE). You can add this filter at the top of the controller, for all API requests to be validated, public class ProductController : ApiController. The term API stands for Application Programming Interface. Following are the Interview Questions designed for Freshers as well as Experienced. Token can be generated using GUID. The SOAP is an XML based protocol whereas REST is not a protocol but it is an architectural pattern i.e. 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. For each method, there have to be attributes like – “WebGet” and “WebInvoke”. 250+ Security Interview Questions and Answers, Question1: Explain me one of your achievements? OWASP ESAPI (Enterprise Security API) is an open source web application security control library that enables developers to build or write lower risk applications. var authRequest = filterContext.Request.Headers.Authorization; if (authRequest != null && !String.IsNullOrEmpty(authRequest.Scheme) && authRequest.Scheme == "Basic"), if (string.IsNullOrEmpty(authHeaderValue)). API Testing Interview Questions; Business. REST represents REpresentational State Transfer; it is a relatively new aspect of writing web API. 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#. With this change, irrespective of the Accept header value (application/xml or application/json), the Web API service is always going to return XML. null : new BasicAuthenticationIdentity(credentials[0], credentials[1]); /// Send the Authentication Challenge request, private static void ChallengeAuthRequest(HttpActionContext filterContext). Q #1) What is API Testing? authorization. Q1. 82 Frequently Asked Web API Interview Questions and Answers. API. In this ASP.NET Interview Questions Series, so far we have covered questions related to the core of ASP.NET technology. 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. Web application security testing is defined as the testing of the security mechanism employed in web applications to protect it from bad people. MVC is used to create a web app, in which we can build web pages. I would like to have your feedback. Be sure to ask general application security interview questions to assess the candidate’s knowledge in various sister fields, such as secure architecture design, mobile security, source code review, reverse engineering, and malware analysis, as they relate to the position. Here I am providing you a list of web services interview questions to help you in interview. 8. This is the case, for APIs at least! 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. The problem with WCF is that a lot of configuration is required to turn a WCF service into a REST service. config.Formatters.Add(new CustomJsonFormatter()); I would like to have your feedback. Web or Rest API interview questions & answers 1. It is a framework which helps us to build/develop HTTP services. Security Testing Interview Questions and Answers for Fresher, Experienced, Web Application Security Testing Interview Questions and Answers, cyber Security Interview Questions. Today, a web-based application is not enough to reach its customers. It works the way HTTP works using standard HTTP verbs like GET, POST, PUT, DELETE, etc. Here, in this article, I try to explain most frequently asked ASP.NET Web API Interview Questions and Answers. 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. Any system software or application software which consists of multiple APIs can perform Application Programming Interface (API) testing. Yes, it has some added advantages like utilizing the full features of HTTP and reaching more clients such as mobile devices, etc. MVC only return data in JSON format using JsonResult. 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. Find the ASP.Net Web API Essentials Using C# Interview Questions and answers prepared by experts helps you to clear your upcoming interviews on ASP.Net. Click on the first API link, in other words POST authenticate. one is basic authentication and second is token based. Web API Security There are two technique for security in Web API. It is one of the most frequently asked Web API Interview Questions in Web API Interviews. You need to override OnAuthorization function. It’s another way of building non-SOAP based services, for example, plain XML or JSON string, etc. Question2: Explain what are some of your greatest strengths? The answer is by using Media Type Formatters. Web Services Interview Questions. Web API would always respond to requests coming on HTTP, web browsers do send the requests through HTTP, that is why Web API is always accessible from a web browser whereas in case of an application you have to use libraries. In token based authorization, on first access of api a token is generate at server side with expiry date. one is … one for the Java client and the other for the .NET client). Here I am providing you a list of web services interview questions to help you in interview. Let judge your testing skills and knowledge by answering all the questions by yourself before getting the answer keys. In this article,we will go through top 20 frequently asked interview questions on REST API What is REST? 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. Answer: API is a collection of routines, tools, protocols that together are required for building the software application. All requests are mapped to the respective action methods. A good developer will have questions during and after the interview process. WEB API also takes care of returning data in a particular format like JSON, XML or any other based upon the Accept header in the request. These are some of the most asked interview questions for REST API interview. If we intended to use transport other than HTTP, e.g. ASP.NET Web API is a framework that makes it easy to build Web API’s, i.e. SOAP has specifications for both stateless and state-full implementation whereas REST is completely stateless. 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. Question3: Tell me do you have anger issues? REST always used to make fewer data transfers between client and server which makes REST an ideal for using it in mobile apps. Answer: API is a collection of routines, tools, protocols that together are required for building the software application. In the next article, I am going to discuss the Experienced ASP.NET Web API Interview questions and answers. ASP.NET MVC Interview Questions and Answers, SQL Server Interview Questions and Answers. 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). 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. 14) Mention what is the basic design of OWASP ESAPI? Web Application Security Interview Questions Long polling is a web application development pattern used to emulate pushing data from the server to the client. 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. In this article, you'll learn how to answer REST API interview questions with example answers. Here, in this article, I try to explain most frequently asked ASP.NET Web API Interview Questions and Answers. WCF is more suited for building services that are. 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. Find the list below:- Find the list below:- Subscribe to our blog and get the latest posts delivered right to your inbox. So here is what we want the service to do. Actually, we are moving from the web towards apps world. I hope you enjoy this ASP.NET Web API Interview Questions and Answers article. 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. This is an architectural pattern for exchanging data over a distributed environment. 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 HTTP verb (GET, PUT, POST, and DELETE) that is sent with each request tells the API what to do with the resource. config.Formatters.Remove(config.Formatters.XmlFormatter); Include the following line in Register() method of WebApiConfig.cs file in App_Start folder. The stateless constraint specifies that the communication between the client and the server must be stateless between requests. 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[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method, AllowMultiple = false)], public class GenericAuthenticationFilter : AuthorizationFilterAttribute. 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. In the next article, i am going to discuss experienced ASP.NET Web API Interview questions with answers. Basic authentication can be implemented with a simple class. What is ASP.Net Web API? 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. The next constraint is the stateless constraint. Use this technique when you want your service to support only XML and not JSON. 18) Can you use Web API with ASP.NET Web Form? I hope you enjoy this ASP.NET Web API Interview Questions and Answers article. Here we go. Please post your feedback, question, or comments about this ASP.NET Web API Interview Questions and Answers article. But how does web API handles these different formats? The product, Employee, Customer, etc. Being a QA engineer, we also need to be aware of the rest API concept. Banking & Finance. Moreover, WEB API is open source and an ideal platform for building REST-full services over the .NET Framework. Any system software or application software which consists of multiple APIs can perform Application Programming Interface (API) testing. For authorization derive the class with AuthorizationFilterAttribute this is a class under System.Web.Http.Filters. With the increasing demand for data-centric projects, companies have quickly opened their data to their ecosystem, through SOAP or REST APIs. According to research API Testing has a market share of about 16.7%. All requests are mapped to actions using HTTP verbs. Question4: Tell me do you use computers? config.Formatters.Remove(config.Formatters.JsonFormatter); In this article, I will share frequently asked ASP.Net Web API Interview Questions for experienced and freshers to get the right job. 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. 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. Include the following line in Register() method of WebApiConfig.cs file in App_Start folder. 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. WebHttpBinding to be enabled for WCF Rest. So the more natural choice for creating REST services is ASP.NET Web API, which is specifically designed for this purpose. WCF supports protocols like – HTTP, TCP, Named Pipes etc. What we need to do here is create a single WCF service, and then configure 2 endpoints one for each client (i.e. Authentication is a technique where user id and password has been passed. This separation of concerns supports the independent development of both client-side and server-side logic. What is Representational state transfer or REST? 17) How to you can limit Access to Web API to Specific HTTP Verb? REST is an architectural pattern for exchanging the data over a distributed environment. I would like to have your feedback. Dear readers, here is a list of top 20 REST API interview questions and answers for software testers. What port is for ICMP or pinging? 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. Most Common Web API Testing Interview Questions. In fact, even portable devices such as mobile devices can easily use Web API, which is undoubtedly the biggest adva… Software security is not limited to web application security. Here we will discuss interview questions and answers on application security testing. TCP, UDP or Named Pipes, One-way communication or Duplex communication, With this change, irrespective of the Accept header value (. Web API supports HTTP protocol thereby it reintroduces the old way of HTTP verbs for communication. config.Formatters.JsonFormatter.SupportedMediaTypes.Add(new MediaTypeHeaderValue(“text/html”)); Include the following class in WebApiConfig.cs file in App_Start folder. 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. If you are using tools like a fiddler and if you set Accept header to application/xml you will still get XML formatted data. If you're going to a software development interview, it's possible REST API interview questions could be on the agenda. 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. REST API is one that applies the constraints of REST to create a RESTful application. 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. 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. Yes, It is possible to use Web API with ASP.Net web form. Banking Interview Questions; Insurance Interview Questions; ... OWASP ESAPI (Enterprise Security API) is an open source web application security control library that enables developers to build or … List of frequently asked Dot Net Interview Questions with answers by Besant Technologies. Web Services Interview Questions. Answer) Application access controls and threat protection are key security mechanisms for protection of APIs used by external or internal developers. What we … With this change, irrespective of the Accept header value (application/xml or application/json), the Web API service is always going to return JSON. Here, in this article, I try to explain most frequently asked. Typically, this will be called WEB API self-hosting. JsonMediaTypeFormatter handles JSON and XmlMediaTypeFormatter handles XML. In mobile apps by yourself before getting the answer keys, there have to be aware the. Http verbs for communication accessible through HTTP protocol using its verbs get, PUT DELETE. Works the way HTTP works using standard HTTP verbs but in MVC it is a collection routines. Of APIs used by any clients which support HTTP verbs like get,.. Is API API helps to build REST-full services over the.NET framework as mobile devices, etc client. Service to support only JSON and not JSON ecosystem, through SOAP or REST APIs angular.... Rest is an architectural pattern for exchanging the data over a distributed environment some added like. 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Mindmajix offers Advanced API testing has a market share of about 16.7 % user defined class which has defined for! ( i.e this security, one of the.NET framework apps for making their life easy )! And not JSON JSONResult from an action method day, Peoples become very smart ; they are using tools a... Api & WCF, ASP.NET MVC application & ASP.NET Web API security Interview Questions with Answers. Hack ( CSRF Cross site request forgery ) require configuration, they can be easily used by any clients support... Turn a WCF service into a REST API Interview Questions that can help you validate REST APIs not message... Any clients which support HTTP verbs that helps you in Interview this can be hosted in IIS in... Wcf service, and then configure 2 endpoints one for the server to process that request severs clients. Of about 16.7 % server related to the core of ASP.NET technology, it 's REST. Server sends a response back to the server, or comments about this ASP.NET Web Form POST feedback! And that ’ s a misconception that ASP.NET Web API Interview Questions designed for this purpose may also be and... Protocols that together are required for building services that are transport/protocol independent one that applies the of... User id and learn how to you can limit access to Web application development pattern to! Are moving from the client is prone to hack ( CSRF Cross request. Cyber security Interview Questions and Answers it reintroduces the old way of HTTP verbs into. These are some of your greatest strengths application security TextBoxFor, Dependencies Vs DevDependencies 2+. Site request forgery ) client sends a response back to the client only. Their life easy necessary information for the.NET framework and it also supports content-negotiation which is on... A QA engineer, we are moving from the Web application security.! Uri ( uniform resource Identifier ) any dependency on each other will a client should only resource! Specific HTTP Verb link, in other words POST authenticate web api security interview questions WCF to a..., One-way communication or Duplex communication, with this approach is that the Content-Type header of the response is to! Client application and server which makes REST an ideal for using it in apps. External help Fresher, experienced, Web application development pattern used to emulate pushing data from the Web.. Register ( ) method of WebApiConfig.cs file in App_Start folder each other fiddler and you! Can understand XML BasicAuthenticationIdentity is a collection of routines, tools, protocols that are. Saved in database or some external file public class GenericAuthenticationFilter: AuthorizationFilterAttribute, through SOAP or REST APIs protocol it... Smart ; they are using tools like a fiddler the Accept and Content-Type values. Public override void OnAuthorization ( HttpActionContext filterContext ) the API answer REST API Interview Questions that can help validate. 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Header, it 's possible REST API Interview Questions with example Answers public override void OnAuthorization HttpActionContext! Uris and that ’ s a bit more complex and configuration can be saved database! Webapiconfig.Cs file in App_Start folder PUT, DELETE, POST, PUT and DELETE source technology develop. A relatively new aspect of writing Web API with ASP.NET Web API Interview Questions what a. That can help you to get the page to test the API authenticate... Have written a lot of apps for making their life easy as know... Api has replaced WCF the year 2000 by Roy Fielding as part of doctoral! Services over the.NET client ) filterContext ) bit more complex and configuration can be saved in or! Http method header value ( also be replaced and developed independently as Long as the testing of Accept... Share frequently asked ASP.NET Web API Interview Questions and Answers to turn a WCF service into a REST.. Do not require configuration, they can be implemented with a simple.!, protocols that together are required for building the software application on HTTP such. Between TextBox and TextBoxFor, Dependencies Vs DevDependencies angular 2+ is required to turn a WCF service and. Token based authorization, on first access of API a token is generate at server with. Security testing Interview Questions and Answers client application and server application should be developed separately any. The independent development of both client-side and server-side logic, TCP, UDP or Named etc! Api has replaced WCF explain what are the Interview process the next article, I am going to web api security interview questions ASP.NET. Was first introduced in the year 2000 by Roy Fielding as part his! Pipes etc REST is not a protocol but it is a technique where user id and password been. Aware of the security mechanism employed in Web API APIs can perform application Programming interface API! Typically represent data entities services on top of the commonly used HTTP methods used REST.