MuleSoft Certified Integration Architect – Level 1 — Question 38

An API client is implemented as a Mule application that includes an HTTP Request operation using a default configuration. The HTTP Request operation invokes an external API that follows standard HTTP status code conventions, which causes the HTTP Request operation to return a 4xx status code.
What is a possible cause of this status code response?

Answer options

• A. An error occurred inside the external API implementation when processing the HTTP request that was received from the outbound HTTP Request operation of the Mule application
• B. The external API reported an error with the HTTP request that was received from the outbound HTTP Request operation of the Mule application
• C. The HTTP response cannot be interpreted by the HTTP Request operation of the Mule application after it was received from the external API
• D. The external API reported that the API implementation has moved to a different external endpoint

Correct answer: B

Explanation

The correct answer is B because a 4xx status code indicates a client-side error, which often means the external API found an issue with the request it received. Options A, C, and D do not specifically address the HTTP request's validity, but rather focus on internal errors or misinterpretation, which are not the primary reason for a 4xx response.