Which one is NOT a protocol commonly used in API testing?

Which one is NOT a protocol commonly used in API testing?

• A. REST
• B. UDDI
• C. HTTP
• D. XML-RPC

Answer: (D)

The correct answer, indicating the protocol that is not commonly associated with API testing, is XML-RPC. While XML-RPC is indeed a protocol that allows remote procedure calls using XML to encode the calls and HTTP as a transport mechanism, it is less frequently used today compared to more modern and prevalent protocols such as REST and HTTP. REST (Representational State Transfer) has gained substantial popularity for web services because of its simplicity and stateless nature, aligning well with the principles of web architecture. HTTP (Hypertext Transfer Protocol) is fundamental for web communication and is widely used for API testing, as it defines how messages are formatted and transmitted, making it a core element of API interactions. UDDI (Universal Description, Discovery, and Integration) is more about service discovery rather than a testing protocol, but remains relevant in specific contexts, mainly in web services standards. Comparatively, while XML-RPC serves a niche use case in remote procedure calls, it does not have the same level of adoption or relevance in mainstream API testing practices, particularly in comparison to REST and HTTP, which are dominant in the current web ecosystem. Thus, XML-RPC is considered less common in the context of current API testing methodologies.

The correct answer, indicating the protocol that is not commonly associated with API testing, is XML-RPC. While XML-RPC is indeed a protocol that allows remote procedure calls using XML to encode the calls and HTTP as a transport mechanism, it is less frequently used today compared to more modern and prevalent protocols such as REST and HTTP.

REST (Representational State Transfer) has gained substantial popularity for web services because of its simplicity and stateless nature, aligning well with the principles of web architecture. HTTP (Hypertext Transfer Protocol) is fundamental for web communication and is widely used for API testing, as it defines how messages are formatted and transmitted, making it a core element of API interactions.

UDDI (Universal Description, Discovery, and Integration) is more about service discovery rather than a testing protocol, but remains relevant in specific contexts, mainly in web services standards.

Comparatively, while XML-RPC serves a niche use case in remote procedure calls, it does not have the same level of adoption or relevance in mainstream API testing practices, particularly in comparison to REST and HTTP, which are dominant in the current web ecosystem. Thus, XML-RPC is considered less common in the context of current API testing methodologies.