Interview Questions and Answers
Freshers / Beginner level questions & answers
Ques 1. What is a Web service?
Many people and companies have debated the exact definition of Web services. At a minimum, however, a Web service is any piece of software that makes itself available over the Internet and uses a standardized XML messaging system.rnXML is used to encode all communications to a Web service.
- First, a Web service can have a public interface, defined in a common XML grammar. The interface describes all the methods available to clients and specifies the signature for each method. Currently, interface definition is accomplished via the Web Service Description Language (WSDL).
- Second, if you create a Web service, there should be some relatively simple mechanism for you to publish this fact. Likewise, there should be some simple mechanism for interested parties to locate the service and locate its public interface. The most prominent directory of Web services is currently available via UDDI, or Universal Description, Discovery, and Integration.
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Ques 2. What is new about Web services?
People have been using Remote Procedure Calls (RPC) for some time now, and they long ago discovered how to send such calls over HTTP.rnSo, what is really new about Web services? The answer is XML.
rnBy standardizing on XML, different applications can more easily talk to one another, and this makes software a whole lot more interesting.
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Ques 3. I keep reading about Web services, but I have never actually seen one. Can you show me a real Web service in action?
If you want a more intuitive feel for Web services, try out the IBM Web Services Browser, available on the IBM Alphaworks site. The browser provides a series of Web services demonstrations. Behind the scenes, it ties together SOAP, WSDL, and UDDI to provide a simple plug-and-play interface for finding and invoking Web services.
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Ques 4. What is the Web service protocol stack?
The Web service protocol stack is an evolving set of protocols used to define, discover, and implement Web services. The core protocol stack consists of four layers:
rnService Description: This layer is responsible for describing the public interface to a specific Web service. Currently, service description is handled via the WSDL.
rnService Discovery: This layer is responsible for centralizing services into a common registry, and providing easy publish/find functionality. Currently, service discovery is handled via the UDDI.
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Ques 5. What is XML-RPC?
XML-RPC is a protocol that uses XML messages to perform Remote Procedure Calls. Requests are encoded in XML and sent via HTTP POST; XML responses are embedded in the body of the HTTP response.
rnMore succinctly, XML-RPC = HTTP + XML + Remote Procedure Calls.
rnBecause XML-RPC is platform independent, diverse applications can communicate with one another. For example, a Java client can speak XML-RPC to a Perl server.
rnTo get a quick sense of XML-RPC, here is a sample XML-RPC request to a weather service (with the HTTP Headers omitted):
<?xml version="1.0" encoding="ISO-8859-1"?>
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Ques 6. What is SOAP?
SOAP is an XML-based protocol for exchanging information between computers. Although SOAP can be used in a variety of messaging systems and can be delivered via a variety of transport protocols, the main focus of SOAP is Remote Procedure Calls (RPC) transported via HTTP. Like XML-RPC, SOAP is platform independent, and therefore enables diverse applications to communicate with one another.
To get a quick sense of SOAP, here is a sample SOAP request to a weather service (with the HTTP Headers omitted):
<?xml version='1.0' encoding='UTF-8'?>
<SOAP-ENV:Envelope
xmlns:SOAP-ENV="http://www.w3.org/2001/09/soap-envelope"
xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
xmlns:xsd="http://www.w3.org/2001/XMLSchema">
<SOAP-ENV:Body>
<ns1:getWeather
xmlns:ns1="urn:examples:weatherservice"
SOAP-ENV:encodingStyle=" http://www.w3.org/2001/09/soap-encoding>
<zipcode xsi:type="xsd:string">10016</zipcode>
</ns1:getWeather>
</SOAP-ENV:Body>
</SOAP-ENV:Envelope>
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Ques 7. What is WSDL?
The Web Services Description Language (WSDL) currently represents the service description layer within the Web service protocol stack.
In a nutshell, WSDL is an XML grammar for specifying a public interface for a Web service. This public interface can include the following:
Information on all publicly available functions.
Data type information for all XML messages.
Binding information about the specific transport protocol to be used.
Address information for locating the specified service.
WSDL is not necessarily tied to a specific XML messaging system, but it does include built-in extensions for describing SOAP services.
Below is a sample WSDL file. This file describes the public interface for the weather service used in the SOAP example above. Obviously, there are many details to understanding the example. For now, just consider two points.
First, the
Second, the element specifies that the service is available via SOAP and is available at a specific URL.
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Ques 8. What is UDDI?
UDDI (Universal Description, Discovery, and Integration) currently represents the discovery layer within the Web services protocol stack.
UDDI was originally created by Microsoft, IBM, and Ariba, and represents a technical specification for publishing and finding businesses and Web services.
At its core, UDDI consists of two parts.
First, UDDI is a technical specification for building a distributed directory of businesses and Web services. Data is stored within a specific XML format, and the UDDI specification includes API details for searching existing data and publishing new data.
Second, the UDDI Business Registry is a fully operational implementation of the UDDI specification. Launched in May 2001 by Microsoft and IBM, the UDDI registry now enables anyone to search existing UDDI data. It also enables any company to register themselves and their services.
The data captured within UDDI is divided into three main categories:
White Pages: This includes general information about a specific company. For example, business name, business description, and address.
Yellow Pages: This includes general classification data for either the company or the service offered. For example, this data may include industry, product, or geographic codes based on standard taxonomies.
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Ques 9. How do I get started with Web Services?
The easiest way to get started with Web services is to learn XML-RPC. Check out the XML-RPC specification or read my book, Web Services Essentials. O'Reilly has also recently released a book on Programming Web Services with XML-RPC by Simon St.Laurent, Joe Johnston, and Edd Dumbill. Once you have learned the basics of XML-RPC, move onto SOAP, WSDL, and UDDI. These topics are also covered in Web Services Essentials. For a comprehensive treatment of SOAP, check out O'Reilly's Programming Web Services with SOAP, by Doug Tidwell, James Snell, and Pavel Kulchenko.
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Ques 10. Does the W3C support any Web service standards?
The World Wide Web Consortium (W3C) is actively pursuing standardization of Web service protocols. In September 2000, the W3C established an XML Protocol Activity. The goal of the group is to establish a formal standard for SOAP. A draft version of SOAP 1.2 is currently under review, and progressing through the official W3C recommendation process.
On January 25, 2002, the W3C also announced the formation of a Web Service Activity. This new activity will include the current SOAP work as well as two new groups. The first new group is the Web Services Description Working Group, which will take up work on WSDL. The second new group is the Web Services Architecture Working Group, which will attempt to create a cohesive framework for Web service protocols.
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Most helpful rated by users:
- What is a Web service?
- What is new about Web services?
- What is SOAP?
- What is WSDL?
- I keep reading about Web services, but I have never actually seen one. Can you show me a real Web service in action?
Related differences
| RESTful Web Services vs SOAP Web Services | GraphQL vs RESTful Web Services (REST API) | RESTful Web Services (REST API) vs gRPC |
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| Vue.js 面接の質問と回答 - Total 30 questions |
| Svelte.js 面接の質問と回答 - Total 30 questions |
| Shell Scripting 面接の質問と回答 - Total 50 questions |
| Next.js 面接の質問と回答 - Total 30 questions |
| Knockout JS 面接の質問と回答 - Total 25 questions |
| TypeScript 面接の質問と回答 - Total 38 questions |
| PowerShell 面接の質問と回答 - Total 27 questions |
| Terraform 面接の質問と回答 - Total 30 questions |
| JCL 面接の質問と回答 - Total 20 questions |
| JavaScript 面接の質問と回答 - Total 59 questions |
| Ajax 面接の質問と回答 - Total 58 questions |
| Ethical Hacking 面接の質問と回答 - Total 40 questions |
| Cyber Security 面接の質問と回答 - Total 50 questions |
| PII 面接の質問と回答 - Total 30 questions |
| Data Protection Act 面接の質問と回答 - Total 20 questions |
| BGP 面接の質問と回答 - Total 30 questions |
| Ubuntu 面接の質問と回答 - Total 30 questions |
| Linux 面接の質問と回答 - Total 43 questions |
| Unix 面接の質問と回答 - Total 105 questions |
| Weblogic 面接の質問と回答 - Total 30 questions |
| Tomcat 面接の質問と回答 - Total 16 questions |
| Glassfish 面接の質問と回答 - Total 8 questions |
| TestNG 面接の質問と回答 - Total 38 questions |
| Postman 面接の質問と回答 - Total 30 questions |
| SDET 面接の質問と回答 - Total 30 questions |
| Selenium 面接の質問と回答 - Total 40 questions |
| Kali Linux 面接の質問と回答 - Total 29 questions |
| Mobile Testing 面接の質問と回答 - Total 30 questions |
| UiPath 面接の質問と回答 - Total 38 questions |
| Quality Assurance 面接の質問と回答 - Total 56 questions |
| API Testing 面接の質問と回答 - Total 30 questions |
| Appium 面接の質問と回答 - Total 30 questions |
| ETL Testing 面接の質問と回答 - Total 20 questions |
| Cucumber 面接の質問と回答 - Total 30 questions |
| QTP 面接の質問と回答 - Total 44 questions |
| PHP 面接の質問と回答 - Total 27 questions |
| Oracle JET(OJET) 面接の質問と回答 - Total 54 questions |
| Frontend Developer 面接の質問と回答 - Total 30 questions |
| Zend Framework 面接の質問と回答 - Total 24 questions |
| RichFaces 面接の質問と回答 - Total 26 questions |
| HTML 面接の質問と回答 - Total 27 questions |
| Flutter 面接の質問と回答 - Total 25 questions |
| CakePHP 面接の質問と回答 - Total 30 questions |
| React 面接の質問と回答 - Total 40 questions |
| React Native 面接の質問と回答 - Total 26 questions |
| Angular JS 面接の質問と回答 - Total 21 questions |
| Web Developer 面接の質問と回答 - Total 50 questions |
| Angular 8 面接の質問と回答 - Total 32 questions |
| Dojo 面接の質問と回答 - Total 23 questions |
| Symfony 面接の質問と回答 - Total 30 questions |
| GWT 面接の質問と回答 - Total 27 questions |
| CSS 面接の質問と回答 - Total 74 questions |
| Ruby On Rails 面接の質問と回答 - Total 74 questions |
| Yii 面接の質問と回答 - Total 30 questions |
| Angular 面接の質問と回答 - Total 50 questions |