Answer:- HTTPResponseMessage allows us to keep track of the status of the request sent to the service provider. By which we can assume the events. It works on the HTTP protocols and returns the proper status code that is the HTTP response message making things easier for clients to understand. If the request sent was successfully admitted or renounced.

Answer:- Advantages of using ASP.NET Web API: 1. ASP.NET Web API supports all the MVC features, including routing, filter, and controllers. 2. It is very light and easy to use. 3. It is an ideal platform for building applications of Low Bandwidth. 4. Most suitable to develop non-SOAP HTTP Based Services. 5. Content negotiation and several drive support make it more convenient to use.

Answer:- Caching is the method of depositing and transmitting the data into the software identified as Cache. We can understand Cache as a storeroom. Cache helps to run the processor comparatively fast by storing all the in an auxiliary location.

Answer:- HTTPError exception filters handle all the exceptions thrown while making the HTTP requests and are unhandled by other filters. Then these filters deal with all the filtered exceptions.

Answer:- A series of message handlers are chained together to respond to several HTTP requests in the server. And finally, at some point. The response is generated and is returned to the client back in the opposite direction. And, this process of receiving the request and then returning the response to the client is known as Delegating handler.

Answer:- Yeah, it is possible. We can use ASP.NET Web API in applications generated using other .NET languages. The only mandatory thing is that it needs to support the HTTP protocol.

Answer:- Content negotiation defines the format of the response. To be sent back to the range of clients. And, this makes the Web API work more explicitly when used on different devices other than PC like mobile devices and tablets.

Answer:- For Web API Versioning, youll need to follow these steps: Step 1: URI • Changes the URI with the help of Web API routing Step 2: QueryString parameter • Adds another query string to find the controller Step 3: Custom Header parameter – • Provides additional information Step 4: Accept Header parameter –

Answer:- In the Basic HTTP Authentication, the user relinquishes the username and the password to the HTTP authorization request. And these passed-in values are further decoded. Later it is changed to a string by using an encoding, which helps in the easy authentication.

Answer:- Digest authentication is very comparable to that of basic authentication. It uses the same protocol of taking the username and password and then generating a unique key and sending a request to the server. But, before sending the information over to the internet. It applies a hash over the username and password of the client, which makes it more secure to lean on.

Answer:- Here, OData notions Open Data Protocol. It provides a uniform way to set and administer all the CRUD operations effectively. It allows the creation of REST APIs and consumption of REST APIs. And, this additionally helps its users to edit resources using the authorized methods. ODATA first came into existence in the year 2007 by Microsoft Team.

Answer:- Okobjectresult executes the content negotiation and formats the response body and returns the 2XX response after completion.

Answer:- Total four main types of Web APIs are known. And, these are as follows: 1. Open APIs – Openly available for all to use. 2. Partner APIs – Not publicly available and requires one to have access to that particular API. 3. Internal APIs – These are private APIs that are created and used by any particular group or organization. 4. Composite APIs – These types of APIs are the union of multiple other APIs. And are practiced to boost up the speed of execution and operation.

Answer:- To keep Web API secured, you can opt for these three ways: 1. HMAC authentication: In HMAC authentication, the service provider processes a unique API key and a Secret Key to its client. And, with the help of those authorization keys, one can call the API. It will generate a hash HMAC signature. Now, by using both the parameters, one can request the server. The same method will take place on the end of the server. And, if both the HMAC signatures matched, then the authorization will be successful. 2. Digital Signature: This method works by covering the message with a secret key generated by the security signature. Now the client will send this private key to the server. Each request will now get signed by the private key, so the server can undoubtedly authorize the request. This signature key must be kept confidential by the owner to avoid any controversy. 3. OAuth: OAuth is one of the most used methods practiced for protecting the security of Web APIs. In this, the users need to log in to the services of the server. And after successfully logging in, the user is provided with a unique auth key that they can use to make requests to the server.