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| Section | Weight | Objectives |
|---|---|---|
| Secure Data at Rest and in Transit | 20% | - Implement security policies - Manage keys and certificates - Expose and invoke APIs over HTTPS - Manage secure environment properties |
| Implement Monitorable Mule Applications | 15% | - Expose health check endpoints - Implement logging and log management - Monitor applications and runtimes - Implement message correlation |
| Implement Performant and Reliable Mule Applications | 27% | - Validate messages and payloads - Handle HTTP API invocations and errors - Use ObjectStore for persistence - Implement reliable messaging patterns - Optimize performance and throughput |
| Implement Maintainable and Modular Mule Applications and Maven Builds | 25% | - Build custom policies and processors - Execute tests with Maven - Implement automated deployment - Create reusable libraries - Modularize applications and builds |
| Design and Implement API-led Connectivity | 13% | - Implement API autodiscovery - Implement server-side caching - Implement HTTP callbacks/webhooks |
>> Mule-Dev-301 Certification Exam <<
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NEW QUESTION # 26
Refer to the exhibits.
The HTTP Request operation raises an HTTP:CONNECTIVITY error.
Which HTTP status code and body are returned to the web client?
Exhibit:
Answer: A
Explanation:
The HTTP Request raises HTTP:CONNECTIVITY, so processing moves to the flow's On Error Propagate handler. Inside that handler, the variable httpStatus is explicitly set to 200, and the payload is changed to
"Error in processing your request."
However, because the handler is On Error Propagate, the Mule event remains in an error state after the handler completes. Therefore, the HTTP Listener uses its configured Error Response, not its normal Response configuration.
The exhibit shows that the Error Response status code is:
#[vars.httpStatus]
and its body is explicitly:
output text/plain --- error.description
Consequently, the status code is 200 because the error handler assigned that value to vars.httpStatus, while the body comes from error.description, which contains the description of the HTTP:CONNECTIVITY error. The payload set inside the error handler is not the expression used by the listener's configured Error Response.
MuleSoft documents that unsuccessful listener executions use the error-response definition and that status, body, headers, and other fields can use flow variables and DataWeave expressions.
Reference topics: HTTP Listener Error Response; On Error Propagate; Mule error object; error.description; response status variables.
Official documentation: https://docs.mulesoft.com/http-connector/latest/http-listener-ref
NEW QUESTION # 27
Refer to the exhibit.
A developer generates the base scaffolding for an API in Anypoint Studio.
Which HTTP status code is returned while testing using the API Kit console if no values are entered in client- id and client-secret?
Exhibit:
Answer: A
Explanation:
The RAML trait shown in the exhibit declares client_id and client_secret as headers and applies that trait to the /customers resource. Because these headers form part of the API contract, APIkit Router validates the inbound request against the specification before routing it to the generated implementation flow.
If the required request structure is not honored, APIkit raises an APIKIT:BAD_REQUEST error. MuleSoft's APIkit error-handling reference maps APIKIT:BAD_REQUEST directly to HTTP 400, and APIkit scaffolding generates the corresponding error-handling logic with httpStatus set to 400.
A 403 response would normally represent a request that was understood but rejected because of authorization.
That is not what is happening here: the request fails API contract validation before successful routing because required request information is absent. A 500 indicates an internal server failure, which is also inappropriate for malformed client input.
Therefore, when the API Console submits the request without the required header values, the APIkit- generated implementation treats it as a bad request and returns HTTP 400.
Reference topics: APIkit Router validation; RAML traits; required headers; APIKIT:BAD_REQUEST; APIkit-generated error handling.
Official documentation: https://docs.mulesoft.com/apikit/latest/apikit-error-handling-reference
NEW QUESTION # 28
Refer to the exhibits.
The flow name is "implementation" with code for the MUnit test case.
When the MUnit test case is executed, what is the expected result?
Exhibit:
Answer: B
Explanation:
The significant attribute in the MUnit definition is expectedErrorType="APP:CUSTOM_ERROR". The referenced implementation flow deliberately invokes raise-error with exactly the same error type: APP:
CUSTOM_ERROR.
MUnit supports expected-error testing specifically for negative scenarios. When expectedErrorType is configured, the test is considered successful when execution produces that expected Mule error. The raised error is therefore not treated as an unexpected test failure; it satisfies the test's declared expectation.
The apparently failing assertion-testing true against equalTo(false)-does not change the result in this scenario because normal execution does not reach the validation chain after the referenced flow raises the expected error. The expected error terminates the execution path being tested and satisfies the MUnit expectation.
If the implementation generated a different error type, option B would apply. If it generated no error when an error was expected, the test would also fail. Here, however, the flow explicitly raises the exact application- defined error specified by the test.
Reference topics: MUnit Test Structure; expectedErrorType; Error Testing; Raise Error Component.
Official documentation: https://docs.mulesoft.com/munit/3.6/munit-test-concept
NEW QUESTION # 29
When implementing a synchronous API where the event source is an HTTP Listener, a developer needs to return the same correlation ID back to the caller in the HTTP response header.
How can this be achieved?
Answer: A
Explanation:
Correlation IDs are part of Mule event processing and provide the primary mechanism for tracing an execution across application components. Mule first examines the source message for a correlation identifier.
For an HTTP Listener request, an incoming X-CORRELATION-ID or MULE_CORRELATION_ID header can establish the Mule event's correlation ID. If the source does not provide one, Mule generates a unique correlation ID for the event.
For the synchronous HTTP Listener scenario tested by the MuleSoft Developer II curriculum, the same correlation context is associated with the request-response execution, so no special API policy, scaffolding option, or Listener "CorrelationID" checkbox is required to satisfy the stated requirement.
Options B and C describe configuration controls that are not part of the normal HTTP Listener/APIkit scaffolding model. A custom correlation policy would only introduce unnecessary complexity where Mule's runtime correlation mechanism already handles the event correlation lifecycle.
The broader operational principle is important: correlation IDs should remain stable for the execution being traced so that request handling, logs, downstream processing, and the associated synchronous interaction can be related during production diagnostics.
Reference topics: Mule Event; Correlation ID; HTTP Listener; X-CORRELATION-ID; distributed tracing and observability.
Official documentation: https://docs.mulesoft.com/mule-runtime/latest/correlation-id
NEW QUESTION # 30
Refer to the exhibit.
A developer generates the base scaffolding for an API in Anypoint Studio.
Which HTTP status code is returned while testing using the API Kit console if no values are entered in client-secret?
Answer: B
Explanation:
Based on the code snippet and schema.json file below, when testing using the API Kit console if no values are entered in client-secret, HTTP status code 403 (FORBIDDEN) is returned. This is because client-secret is defined as a required header parameter in schema.json file, which means that it must be present in every request. If no values are entered in client-secret, then it is equivalent to omitting this header parameter, which violates the schema and causes APIKit Router to return HTTP status code 403. Reference: https://docs.mulesoft.com/apikit/4.x/apikit-4-headers
NEW QUESTION # 31
......
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