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Web Services Test

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Type

Programming Skills

Time

10 minutes

Level

Medium

Questions

12

About the Test

Web services assessment is the process of evaluating a web service’s performance and functionality, typically identifying any potential issues or areas for improvement. This can involve testing the service to see how it responds to various inputs and analyzing its underlying architecture and design to ensure that it is efficient, scalable, and secure.

Web services are applications that provide various services and functions over the internet. They are typically accessed by other applications or systems rather than by end users directly. Web services use standard protocols, such as HTTP, to communicate and exchange data with other applications, and can be accessed using a variety of programming languages and technologies.

Web services are typically used to enable different applications or systems to work together and share data and functionality. For example, a web service might provide weather information that can be accessed by various applications or a payment processing service that different e-commerce websites can use. Web services are an essential part of the modern internet and are used in multiple industries and applications.

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Skills Measured

  • SOA – Principles (Contract, Composability)
  • SOA – Principles (Loosely Coupled, Abstraction)
  • HTTP – Request Lifecycle
  • HTTP – Verbs, Methods
  • HTTP – CORS

Roles

  • Web services engineers
  • Junior web services engineers
  • Web security officers
  • Senior Web engineers

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1

SOA – Principles (Contract, Composability)

Contract: This principle states that web services should have a well-defined interface, which specifies the operations that can be performed and the data that can be exchanged. This helps to ensure that web services can be used and accessed consistently and predictably.

Composability: This principle states that web services should be designed in a way that allows them to be easily combined and composed with other web services to create more complex and robust applications. This enables web services to be reused and shared across different applications and systems.

2

HTTP – Request Lifecycle

HTTP, or Hypertext Transfer Protocol, is the protocol web services use to communicate and exchange data over the internet. The HTTP request lifecycle is the sequence of steps when a web service receives and processes an HTTP request from a client. The details of the HTTP request lifecycle may vary depending on the specific implementation of the web service. The client sends an HTTP request to the web service, which includes information such as the URL, HTTP method (e.g., GET, POST), and any data or parameters being sent.

3

HTTP – Verbs, Methods

HTTP, or Hypertext Transfer Protocol, is the protocol web services use to communicate and exchange data over the internet. HTTP verbs, or methods, indicate the desired action to be performed on a specified resource. Some common HTTP verbs include GET: This verb is used to retrieve information from the server. It is typically used to retrieve the contents of a specified URL, such as an HTML page or an image. POST: This verb is used to send data to the server for processing. It is typically used to submit a form or file to the server.

4

HTTP – CORS

CORS, or Cross-Origin Resource Sharing, is a mechanism used to enable communication between web services hosted on different domains or servers. CORS is necessary because, by default, web browsers prevent requests from being sent to web services on different domains for security reasons. CORS allows web services to specify which other parts can access their resources. This is done using HTTP headers, which are sent along with each request and response.

5

SOA – Principles (Loosely Coupled, Abstraction)

Loosely Coupled: This principle states that web services should be designed in a way that allows them to be independent and self-contained, with minimal dependencies on other services. This helps ensure that web services can be easily changed, modified, or replaced without affecting the application’s overall functionality.

Abstraction: This principle states that web services should be designed to hide the complexity of the underlying systems and technologies and to present a simple and intuitive interface to users and other services. This helps to make web services easier to use and understand and to enable more flexible and robust applications.

The test is created by a subject-matter expert

Testlify’s skill tests are designed by experienced SMEs (subject matter experts). We evaluate these experts based on specific metrics such as expertise, capability, and their market reputation. Prior to being published, each skill test is peer-reviewed by other experts and then calibrated based on insights derived from a significant number of test-takers who are well-versed in that skill area. Our inherent feedback systems and built-in algorithms enable our SMEs to refine our tests continually.

View sample score cards

Top five hard skills interview questions for Web Services

1. What is a web service, and how does it differ from an API?
Why this Matters?

This question helps determine if the candidate understands the technical nuances of web services, as well as their ability to differentiate between related concepts.

What to listen for?

The candidate should be able to define what a web service is, explain the purpose of web services, and provide a clear distinction between web services and APIs.

2. How do you secure a web service?
Why this Matters?

Security is a crucial aspect of web services, and the candidate should have a good understanding of how to secure them.

What to listen for?

The candidate should be able to explain different methods of securing web services, such as SSL, OAuth, and JWT. They should also be able to explain how these methods work and their pros and cons.

3. What is SOAP, and how does it differ from REST?
Why this Matters?

SOAP and REST are two common approaches to building web services, and the candidate should have an understanding of their differences and when to use each one.

What to listen for?

The candidate should be able to explain the differences between SOAP and REST, their strengths and weaknesses, and which situations are best suited for each approach.

4. How do you optimize the performance of a web service?
Why this Matters?

The candidate should be able to identify and address potential bottlenecks in a web service to ensure it performs optimally.

What to listen for?

The candidate should be able to discuss strategies for optimizing web service performance, such as caching, load balancing, and compression.

5. What are some common challenges associated with integrating web services?
Why this Matters?

Integration is a critical component of building web services, and the candidate should be aware of the challenges that may arise when integrating with other systems.

What to listen for?

The candidate should be able to identify common integration challenges, such as versioning issues, data mapping, and error handling. They should also be able to explain how to address these challenges.

Frequently Asked Questions for Web Services

A web services assessment is a tool or method used to evaluate the performance of a web services application or system. Developers typically use this type of assessment and IT professionals to identify strengths and areas for improvement in a web services application, such as its functionality, reliability, and security.

This test will help you identify individuals with prior knowledge and experience in web services. A web services assessment may include various activities, such as testing the application’s performance and functionality, evaluating its security measures, and analyzing its compliance with industry standards and best practices.

  • Web services engineers
  • Junior web services engineers
  • Web security officers
  • Senior Web engineers

  • SOA – Principles (Contract, Composability, Loosely Coupled, Abstraction)
  • HTTP – Request Lifecycle
  • HTTP – Verbs, Methods
  • HTTP – CORS

  • Designing and developing web services applications: This involves creating and implementing web services applications that are functional, reliable, and secure.
  • Testing and evaluating web services applications: This involves conducting tests and evaluations to ensure that web services applications perform as intended and identify and address any issues or concerns.
  • Monitoring and maintaining web services applications: This involves regularly monitoring the performance and functionality of web services applications and taking steps to maintain and improve their performance.

Frequently Asked Questions (FAQs)

Want to know more about Testlify? Here are answers to the most commonly asked questions about our company.

These are ready-made tests, existing in our test library, created by subject matter experts. We have 200+ such skills tests covering various skills from programming skills to DevOps, including Aptitude and Personality testing.

You can go to the ‘Test Library’ tab and search for tests from the Job Role or Test Type drop-down menu.

Currently, we do not offer any sample tests. However, when you select a test, there would be a few practice questions before the start of the actual test, which would give you a fair idea of how the entire test would look.

Our tests typically take between 25-30 minutes to complete.

In case you need to test for a unique skill-set or specialized experience, you can add your own questions and customize the test to suit your requirements.

We’ve put a lot of effort into ensuring a conducive test environment. A stable internet connection, an internet browser with cookies and Java-Script enabled is all that is required!
However, for a smooth test-taking process, we recommend the following browsers:
– Google Chrome
– Internet Expl
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Yes, our tests are compatible with almost all modern mobile devices (including tablets) that have a webcam installed.

Yes, our tests are EEOC (Equal Employment Opportunity Commission) compliant and are whetted by subject matter experts, thus having high reliability (test consistency) and validity (accuracy of the test).

Yes! We integrate with popular recruiting tools such as Greenhouse, Lever, GoodTime, and many more.

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