19 Best Python frameworks: How to choose one? On-campus experience. The ways to optimise a website can include: MEAN stack refers to a collection of JavaScript-based technologies that are used to design and develop web applications. 15 Rest API Interview Question & Answers . Most Frequently asked C programming | Coding Interview Questions and answer for Fresher. Difference Between ASP.NET Web API & WCF, ASP.NET MVC application & ASP.NET Web API application. Data Structures: Data Structures for Coding Interviews. A full-stack developer should know the following: The primary difference between the two includes the following: A RESTful API often called RESTful web service refers to REST (Representational State Transfer) and complete kind of API is the Application Program Interface. Optimising website is an art known only to a few talented ones that primarily involves organic coding with instincts. 17) How to you can limit Access to Web API to Specific HTTP Verb? It is used for creating a wide range of system applications for different OS like Windows, iOS. Before going to list out interview coding questions for practice, let me tell you, these are the generic coding questions. The tools used for various API testing are. To implement this CRM in consonance with their needs, several companies are on a hunt to find the best Salesforce professional for their concern. reversing an array, sorting the array, or searching elements on the array. The article has truly peaked my interest. This interview questions and experience are shared by one of the readers like you. Runscope is a web application that provides backend services and easy to use interface for testing APIs. So, it’s a good idea to brush up your coding skills before you face the interview. It is an architectural style that defines a set of rules in order to create Web Services. How Does Boomi Differ From An Application Programming Interface (api)? Full Stack developers are required to work with dynamic sets of technologies and applications, therefore, they must be well-versed in at least two or three programming languages, including the trending languages like Java, Python, R, etc. In this article, you'll learn how to answer REST API interview questions with example answers. GitHub is where people build software. Programming interview questions These sample Programming interview questions can help you assess the engineering and coding skills of your candidates. 15) What are the main challenges of API testing? ... What is RESTful API and why is it used? When I first looked at the questions, I was fairly surprised since I didn't expect the questions to be on this subject. Ans: API (Application Programming Interface) specifies how some software components should interact with other, in other words it’s a set of functions and procedures that allows the creation of applications which access the features or data of an application or operating system. API framework is self-explanatory. 11 Top Full-Stack Developer Interview Questions. 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. Salesforce is the CRM that everyone is adopting. Get exceptionally good at coding interviews by solving one problem every day. For example, after interviewing and examining a patient, a physi-cian often dictates the results into a tape recorder. This repository contains coding interviews that I have encountered in company interviews. MEAN is made up of four major technologies MongoDB, ExpressJS, AngularJS and Node.js. To be a productive programmer, you need to be able to solve large, sprawling problems over weeks and months. I will keep adding links to this post whenever I will add new java coding interview question. C is a powerful high-level programming language. An API is like an electrical socket – until something is plugged into it, it just sits there. While the class is considered as an abstraction, its function is considered as implementation. 1) Explain what is REST and RESTFUL? 3) What are the common tests performed on API’s? SOAP-stands for Simple Object Access Control, and it is an XML based protocol for exchanging information between computers. In this way, it reduces the need for having your local servers or personal devices to configure and manage your services and applications. Core PHP Interview Questions for Beginners. Not only do you get practice interview questions and answers, but we create detailed explanation videos for each solution, showing you how to solve it in an interview. Remark: For data structures and algorithms in this document. Interview question for Software Engineering.API based coding challenge, classical behavioral questions. More than 50 million people use GitHub to discover, fork, and contribute to over 100 million projects. Currently, there … Microsoft specific DLLs are used to develop software that uses windows API. www” acts as an essential factor. 4) Mention the key difference between UI level testing and API testing? REST API is one that applies the constraints of REST to create a RESTful application. The most common question-patterns for any coding-interview. Most Frequently Asked Web API testing Interview Questions And Answers to Help You Prepare For The Upcoming Interview: API (Application Programming Interface) is known for specifying the interaction between different components. Java Programming Interview Questions Here we are going to cover most frequently asked Python interview questions and answers on Python programming language. The pattern is useful when the class and its functions vary. It is used for creating a wide range of system applications for different OS like Windows, iOS. ... How To Best Utilize Python CGI In Day To Day Coding? Twitter Coding Interview Questions. The most important point to … Web API can be consumed by any clients which support HTTP verbs such as GET, PUT, DELETE, POST. Testing of these functions is known as API testing. Before answering the question, let us tell you that becoming a full-stack developer does not happen overnight and neither by learning an application instantly. Here, we've listed 50 frequently asked programming interview questions and their solutions, so aspiring programmers can be better prepared. Values for test run and for holding the configurable parts, config file is used. API Builder is a PLSQL program consists of four SQL files. 9) Mention what the main areas to be taken in consideration while writing API document ? You can use this coding questions to challenge yourself and to practice any programming language like Python, C/C++, Java, and all other generic computer languages. UI ( User Interface) refers to testing graphical interface such as how user interacts with the applications, testing application elements like fonts, images, layouts etc. Download PDF. C# is a programming language that has been rapidly growing and is being intensively used. ... CGI Programming Interview Questions and Answers (1) Chemical Engineering Interview Questions and Answe (1) cics interview questions … Latest Windows 8 requires C++ language. Candidates should have knowledge on C and C++ language. This is only for fun. Dear readers, here is a list of top 20 REST API interview questions and answers for software testers. When we talk about software architecture, API mainly resides or say concentrates in the Business Logic Layer. 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. I prepared for SQL. Generating temporary “session” access tokens for visitors at the front end. But you should really read my blog for more posts on collection framework knowledge. TestApi is a library of utility and test APIs that enables testers and developers to create testing tools and automated tests for .NET and Win32 application. Your email address will not be published. You may find that the person values creative thinking used to solve complex issues, or you may discover that the interviewee prefers getting lost in repetitive lines of code. PHP is a recursive acronym for PHP Hypertext Preprocessor. Yes, It is possible to use Web API with ASP.Net web form. May 15, 2020. Here we go. Most of these new features are geared towards achieving cleaner and more compact code, and some add new functionality that has never been supported in Java. Interview questions are exclusively designed for job seekers to assist them in clearing interviews. To become a successful full-stack developer, you should at least have the following specialised skills. Implement a data structure to accomplish this, with the following API: Interview question for Software Engineering.API based coding challenge, classical behavioral questions. Using a CDN is best, Specify the character set at the server level, Make fewer HTTP requests, i.e., load as few external resources as possible, Avoid unnecessary images; where possible, use CSS, Ability to work with Version Control System (VCS). Solved in C, Java and Python programming. Your email address will not be published. Coding-Interview-101. The interviewer gets to know your inclination towards technologies and languages that you are acquainted with and can evaluate you based on the answer. It will prevent a certain device from making a definitive number of requests within a defined time. The Best Dell Boomi Interview Questions And Answers. This Python Interview Questions blog will prepare you for Python interviews with the most likely questions you are going to be asked in 2020. 0 Shares. List of Most Frequently Asked Web Services Interview Questions And Answers to Help You Prepare For The Upcoming Interview: In today’s scenario, when we talk about basic necessities of living a technically advanced life, “World Wide Web i.e. ADO.NET Entity Framework Interview Questions, Microsoft OFFICE :- More Interview Questions, Equity Trading & Dealer Interview Questions, Computer System Analyst (Software) Interview Questions, DATA ANALYTICS :- More Interview Questions, Oracle Warehouse Builder Interview Questions, Business Intelligence :- More Interview Quetions, Administrative Assistant Resume & Cover Letter, Manufacturing Production Interview Questions, Top 20 API Testing Interview Questions & Answers, Unit testing is owned by development team, Unit testing is done to verify whether each unit in isolation performs as expected or not, API test are often run after the build is ready and authors do not have access to the source code, For each of their module the developers are expected to build unit tests for each of their code modules and have to ensure that each module pass unit test before the code is included in a build, Top 17 SOAP Web Services Interview Questions & Answers, AP Govt Jobs (Latest) Notifications & Alerts, Top 100 Tableau Interview Questions and Answers, Top 30 Data Analyst Interview Questions & Answers, https://career.guru99.com/wp-content/uploads/2014/08/API1.png, https://career.guru99.com/wp-content/uploads/2013/08/logo-300x137.png. You may get the job opportunity in the field of Django that you desire. Input Injection:  It is the act of simulating user input, in several ways you can simulate user input. So, You still have the opportunity to move ahead in your career in API Testing Development. API Testing and API Rest Interview Questions and answers: Q1. It is a set of functions to which the developers performs requests and receive responses. Last updated: 2020.11.26. It is easy to restrict access to an ASP.NET Web API method to be called using a particular HTTP method. I will keep adding links to this post whenever I will add new java coding interview question. Popular tools used for API documentations are JavaDoc (for Java code ) Doxygen (for .Net code). So, this tutorial will help you to practice some Django interview questions and answers, which are very important to showcase your understanding in an interview. Answer: An API opens up secure access to data in an application but it does not accomplish the integration itself. Development is done in C programming language. Twitter Coding Interview Questions. 18) What are the types of Bugs will API testing finds? The above-mentioned questions are quick, insightful and feature key pointers that are a significant part of the interview process. To do well in an interview, then, you need to be able to solve small problems quickly, under duress, while explaining … In this tutorial, I will be sharing the top 10 Java 8 coding and programming interview questions and answers. It is used in areas that require an abstraction that needs to be decoupled from its implementation to enable the two to stand independently. The program the interface utilises HTTP protocol to define the set of function such as GET, PUT, POST and DELETE data. It is a full-stack development toolkit used to develop a fast and robust web application. 21) What are the common protocols that are testing in API tesing ? In this pattern, an interface is utilised and acts as a bridge liberating the functionality of concrete classes from interface implementer classes. C is called as mother language of all programming language. Zoho interview coding questions on string, linked-list and array for freshers. 17) Explain what are the principles of API test design? 14) What is Input injection and what are different ways of doing it ? The answer and explanation of each question have given at end of this post. At Educative.io, we’ve talked to hundreds of candidates who went through design interviews. I have only used Stream API functions to solve the below questions. Any system software or application software which consists of multiple APIs can perform Application Programming Interface (API) testing. Good knowledge on Groovy language will boost your confidence. Being a QA engineer, we also need to be aware of the rest API concept. Cloud computing is a way to deliver computing as a service rather than a product. What is API testing? It is a set of rules (code) and specifications that software programs can follow in order to communicate. This post contains frequently asked Java tricky coding interview questions with answers( with explanation). Get exceptionally good at coding interviews by solving one problem every day. You can share your interview experience as well. A software system implementing an API contains functions or sub-routines that can be executed by another software system. 19) What are the tools used for API test automation? 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 free and open-source stack offers a prompt and organised approach for creating rapid prototypes for web applications. You are here: Home 1 / Latest Articles 2 / Testing 3 / Top 20 API Testing Interview Questions & Answers last updated December 14, 2020 / 1 Comment / in Testing / by admin 1) What are the tools used for API testing? In case exceeding the defined number of requests, a 429 Too Many Attempts HTTP error should be thrown. It is very important to know when to use any one of them. Follow our Wisdomjobs page for Groovy (programming language) interview questions and answers page to get through your job interview successfully in first attempt. C is a powerful high-level programming language. As with all interviews, the interviewer will typically save the last five minutes for your questions. Like!! It can be used for a number of operating systems such as Windows, iOS, Android, etc. It provides a set of common test building blocks, types, data-structure and algorithms. If you want to help new job aspirants to get their dream job, kindly share your experience on CSEstack Portal, by filling this … It is a user-friendly stack that is ideal to build dynamic websites and applications. Many computer science graduates and programmers are applying for coding and software development roles but have no idea what kind of programming questions to expect in interviews. Well it is not interview question.. :-). It can be used for a number of operating systems such as Windows, iOS, Android, etc. However, it is important to record the device with more than just an IP address as this is not unique to the device and can result in an entire network losing access to an API. To test the API’s you should follow the following steps. It is also one of the darling topics of interviewers and you will hear a lot of questions about an array in any coding interview, e.g. I have been posting data structure and coding interview questions on various topics such as Array, Queue, Stack, Binary tree, LinkedList, String, Number, ArrayList, etc.So I am consolidating a list of java coding interview questions to create an index post. Most Common Web API Testing Interview Questions. Details Last Updated: 22 October 2020 . Using this API, applications are developed to run on Win32 machines. Programming interview questions These sample Programming interview questions can help you assess the engineering and coding skills of your candidates. Hopefully, this list of interview questions will be the one-stop resource in your search on Python coding interview questions which helps you to crack any Python interview. Win32 Api is the 32-bit programming interface API for windows. These Python questions are prepared by the expert Python developers. Whether you are a beginner in Java or an expert programmer, you will be tested for your coding skills in the interview. Answer: API is a collection of routines, tools, protocols that together are required for building the software application. Each question in an interview, in contrast, lasts less than one hour. REST represents REpresentational State Transfer; it is a relatively new aspect of writing web API. The main aim of describing the definition of Web services as well as REST above is to help you relate to the term ‘RESTful web services’ because RESTful web services are defined as web services that use the HTTP method and are based on the architecture of REST. 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. One of such rounds involves theoretical questions, which we covered previously in 160+ Data Science Interview Questions. The Fizz Buzz Test is a way to filter out candidates that do not have basic programming knowledge. Author: @xianzhez. Required fields are marked *. Q #1) What is API Testing? List key things to consider when coding with SEO in mind. Capgemini is a French-based multinational professional service and business consulting company. These include: In this situation, if the data within the API is accessible to the public, then technically it will not be possible to entirely prevent data scraping. To learn full-stack web development or mean stack web development, click here. It has been 6 years since Java 8 was released. MVP is a derivation of the MVC (Model View Controller example) architectural pattern. I have already shared the Java 8 Interview questions and answers. The core API gives access to some tools for the programmer to code. API Testing Interview Questions. Place all assets on a separate, cookie-free domain. Most Frequently asked C programming | Coding Interview Questions and answer for Fresher. Here we are going to cover most frequently asked Python interview questions and answers on Python programming language. Being a good programmer has a surprisingly small role in passing programming interviews. That’s why we decided to bring these essential QA testing interview questions that can help you validate REST APIs. Save my name, email, and website in this browser for the next time I comment. Top 25 Microsoft Word Interview Questions & Answers, Top 25 Backbone.js  Interview Questions & Answers, Verification of the API whether it is updating any data structure, Verify if the API does not return anything, Based on input conditions, returned values from the API’s are checked, Verification of the API whether it triggers some other event or calls another API, Full functionality of the system is considered in API testing as it will be used by the end-user (external developers who will use your API ), Select the suite in which you want to add the API test case, Develop test cases for the desired API methods, Information required for each function in the document, For setting API parameters and starting the process one file is responsible, Two files are created for temporary tables and Master package to create the outputted code, Fourth file creates “spooled” output of the code into a file called “output_script_.sql”, Invocation using an accessibility interface, Fails to handle error conditions gracefully, Select the test case that has to be fulfilled, To meet the test case configure the API parameters, Determine how will you validate a successful test, Using programming language like PHP or .NET execute the API call, Allow the API call to return the data to validate. Your email address will not be published. In general, the MVP pattern allows separating the presentation layer from the logic.The difference between the two is as follows: To build a site optimised for organic search engine rankings, it is important to implement certain standards throughout the code. Java Programming Interview Questions are always the deciding factor in any Java interview. Further, I will suggest you to read more on above questions apart from this post. Since Web API services do not require configuration, they can be easily used by any client. It is a widely used open-source programming language especially suited for creating dynamic websites and mobile API's. The term REST stands for REpresentational State Transfer. Coding Ninjas student bags an internship at JP Morgan & Chase, Understanding the Snake and Ladder problem, Difference: Procedural & Object-Oriented Programming, Guide to building a Currency Convertor using fixer API, Creating a responsive website using Bootstrap, Advanced Front-End Web Development with React, Machine Learning and Deep Learning Course, Ninja Web Developer Career Track - NodeJS & ReactJs, Ninja Web Developer Career Track - NodeJS, Ninja Machine Learning Engineer Career Track, It carries the request parameter in the URL string, Takes the request parameter in the message body, The interaction with the model is passed through the presenter, Using the correct HTML tags for content hierarchy i.e.,

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and p, Connect the site to the company’s social pages, Use vanity/friendly URLs (human-readable), Integrate Google analytics (or alternative), Specify a favicon, bonus for specifying browser-specific icons, Specify unique titles for each page without exceeding 70 characters, Ensure there is enough content with enough relevant keywords (search engines will penalise your site if all pages are one-sentence pages), Blocking requests based on the user agent string (easy to circumvent). in bold: you must know the concept and complexity, and can implement in real code. Automated test cases must represent in “ parse-table” format within config file. Attribute programming plays a important role. Difference Between ASP.NET Web API & WCF, ASP.NET MVC application & ASP.NET Web API application. Answer) Application access controls and threat protection are key security mechanisms for protection of APIs used by external or internal developers. An API (Application Programming Interface) may be used for a web-based system, software library, computer hardware, and an operating or database system. While, API enables communication between two separate software systems. As part of the process, we’ve compiled a list of most frequently asked System Design Interview Questions. In fact, even portable devices such as mobile devices can easily use Web API, which is undoubtedly the biggest adva… C# is a simple, modern and object-oriented language.Some of the particular syntax used in C# are semicolons, curly brackets, variables (two variables are assigned with the help of an equal sign) and square brackets. Your services and easy to use any one of them be a productive,... Fairly surprised since I did n't expect the questions, which stores elements at a contiguous memory location method be... Its function is considered as implementation for API test automation answer: an API opens up secure access an... A particular HTTP method assess the engineering and coding skills in the of! With SEO in mind about a person ’ s favorite programming project can tell,. Example, after interviewing and examining a patient, a physi-cian often dictates the results into tape! Mvc ( Model View Controller example ) architectural pattern above questions apart from this post whenever I be... Software Engineer interview questions are quick, insightful and feature key pointers that are testing in tesing... Candidates who went through design interviews ahead in your next Python job interview, one approach can. You 're going to list out interview coding questions for practice, let me tell you, these are tools. Ones that primarily involves organic coding with SEO in mind explanation of each question in application... To generate access tokens the developers performs requests and receive responses Attempts HTTP error should be.... Real code & ASP.NET Web API with ASP.NET Web API the tools used creating! To build dynamic websites and mobile API 's basic programming knowledge electrical socket – until something is plugged it. Recursive acronym for php Hypertext Preprocessor C++ language the interviewer gets to know your inclination towards technologies and languages you. A significant part of the MVC ( Model View Controller example ) architectural pattern of multiple can. Best Utilize Python CGI in Day to Day coding me tell you What the main to. For Simple Object access Control, and contribute to over 100 million projects key security mechanisms protection! Api testing developer function? What are the principles of API testing development one. Of all programming language especially suited for creating rapid prototypes for Web applications, PUT,,. Java programming interview questions and answers are given below.. 1 ) What are the common protocols that testing! In mind programmers can be better prepared information between computers full-stack developer you., its function is considered as implementation can simulate user input, several! 160+ data Science interview questions | coding interview question for software testers 100 million.. Four major technologies MongoDB, ExpressJS, AngularJS and Node.js know your inclination towards technologies languages... And website in this article, you should follow the following steps few talented ones primarily. And their solutions, so aspiring programmers can be reverse-engineered, thus allowing anyone to generate access tokens is used. The deciding factor in any Java interview as get, PUT, post and DELETE.. The following steps and coding skills before you face the interview process something is into. It ’ s favorite programming project can tell you, these are the tools used for API design... Is API the principles of API test automation made via HTTP protocol in contrast, lasts less than hour... Ways of doing it four SQL files and organised approach for creating a wide range system... Api and why is it used article, you should at least have the following specialised skills programmer. An art known only to a software system your career in API?. How to answer REST API is like an electrical socket – until something is plugged into,. Cookie-Free domain they can be manipulated and altered without affecting each other in Java an. Hundreds of candidates who went through design interviews also need to be a productive,. Pattern, an interface is utilised and acts as a service rather than a product asked interview. Api creation involves organic coding with instincts application & ASP.NET Web API with ASP.NET Web API & WCF ASP.NET... Gets to know your inclination towards technologies and languages that you desire, I will be tested for questions. Not interview question for software Engineering.API based coding challenge, classical behavioral questions APIs by... Sql files Engineers Pre-Screening software Engineer Position of rules ( code ) and specifications that software programs follow! Rest APIs technologies MongoDB, ExpressJS, AngularJS and Node.js it used, or searching elements on the whiteboard spend... Not have basic programming knowledge normal: you must know the concept and complexity, but pseudo-code fine! Quickly becoming defacto standard for API documentations are JavaDoc ( for.Net code ) and that... Over 100 million projects soap-stands for Simple Object access Control, and it is a way to computing. That ’ s answer and explanation of each question have given api coding interview questions end this! Small role in passing programming interviews php is a way to deliver as. As API testing use interface for testing APIs questions you are going to cover most frequently asked programming questions... Will be sharing the top 10 Java 8 coding and programming interview questions answers. Offers Advanced API testing you use Web API services of these functions is known as API interview... Decoupled from its implementation to enable the two to stand independently acronym for php Hypertext Preprocessor end can api coding interview questions and. Elements on the whiteboard several ways you can simulate user input the developers performs requests and responses. While the class is considered as implementation user input a dream career as API testing on this subject access! Automate API services have given at end of this post contains frequently asked design... Testing has a market share of about 16.7 % any one of them at a contiguous memory location agenda! Uses api coding interview questions API can you use Web API to specific HTTP Verb Builder a. Front end can be consumed by any client abstraction that needs to be able to solve large, problems... Api ) testing this interview questions and answers on Python programming language that has rapidly. Tell you, these are the generic coding questions could be on the front end be! Asp.Net Web API to specific HTTP Verb follow in order to create a RESTful application: a one. Being intensively used stack Web development, click here testing in API.! An expert programmer, you 'll spend the interview talking and drawing on the whiteboard can! Sharing a list of top 20 REST API concept is possible to use for... Favorite programming project can tell you What the applicant enjoys about work API and why it... This list of most frequently asked Python interview questions: c # is a new. Talking and drawing on the front end of all programming language you validate REST APIs project can tell,! Limit access to data in an application of APIs used by external or internal developers asked Java coding. The set of function such as Windows, iOS, Android, etc given below 1., classical behavioral questions classes can be used for API documentations are JavaDoc ( for Java code ) your job. The below questions years since Java 8 was released you for your questions last five minutes your! Organic coding with instincts talking and drawing on the whiteboard the 32-bit interface. Rare limiting when coding with SEO in mind api coding interview questions I comment successful full-stack developer, still. Dream career as API testing developer interviewing and examining a patient, a 429 Too Many Attempts HTTP should! Technologies MongoDB, ExpressJS, AngularJS and Node.js a programming language especially suited for creating a wide of. Have encountered in company interviews learning about a person ’ s favorite programming project can tell you these! What is input injection: it is a collection of routines, tools, protocols together. And examining a patient, a physi-cian often dictates the results into a tape recorder of 35 interview! 100+ Capgemini interview questions therefore, both classes can be easily used by external or internal developers writing Web to... Engineer interview questions could be on this subject a Web application that provides backend and... A set of common test building blocks, types, data-structure and algorithms in article! Is very important to know your inclination towards technologies and languages that you are going to a talented... Having your local servers or personal devices to configure and manage your services and to! ( Model View Controller example ) architectural pattern data Science interview questions and answers for Engineering.API... Inclination towards technologies and languages that you desire deliver computing as a service rather than product... Framework knowledge the below questions develop a fast and robust Web application most likely questions you going... Rather than a product within a defined time writing Web API can be for. Testing in API document five minutes for your questions storage, application hosting, website... Soap-Stands for Simple Object access Control, and it is used for creating rapid for... At least have the following specialised skills answers: Q1 concentrates in the field of django you... On c and C++ language that software programs can follow in order to communicate develop software that Windows! Towards technologies and languages that you are acquainted with and can evaluate you based on the front end can used. The creation of APIs, etc cover most frequently asked system design interview questions should at least have the to! These essential QA testing interview questions and answers my name, email, and evaluate! In consideration while writing API document explain how to you can simulate user input, in several ways you simulate! Spend the interview talking and drawing on the answer and explanation of question... Of most frequently asked Python interview questions quickly becoming defacto standard for API test automation ( code ) key! Automated api coding interview questions cases must represent in “ parse-table ” format within config is! Rest to create Web services abstraction that needs to be considered when writing API explain. Should at least have the following specialised skills protocol to define the of.