Question # 1
A custom policy needs to be developed to intercept all cutbound HTTP requests made by Mule applications.
Which XML element must be used to intercept outbound HTTP requests? | | A. It is not possible to intercept outgoing HTTP requests, only inbound requests | | B. http-policy:source | | C. htt-policy:operation | | D. http-policy:processor |
The http-policy:processor element is used to intercept outbound HTTP requests made by Mule applications. It allows customizing the request before it is sent to the target API and modifying the response after it is received from the target API.
References:
https://docs.mulesoft.com/api-manager/2.x/policy-mule4-custom-policy#policy-xml-file
Question # 2
A heathcare customer wants to use hospital system data, which includes code that was developed using legacy tools and methods. The customer has created reusable Java libraries in order to read the data from the system.
What is the most effective way to develop an API retrieve the data from the hospital system? | | A. Refer to JAR files in the code | | B. Include the libraries writes deploying the code into the runtime | | C. Create the Java code in your project and invoice the data from the code | | D. Install libraries in a local repository and refer to it in the pm.xml file |
D. Install libraries in a local repository and refer to it in the pm.xml file
Explanation:
To develop an API that retrieves data from a hospital system using reusable Java libraries, the developer should install libraries in a local repository and refer to it in the pom.xml file. This way, the developer can use Maven to manage dependencies and invoke Java code from Mule applications using Java Module operations.
References:
https://docs.mulesoft.com/mule-runtime/4.3/java-module-reference#add-the-java-module-to-your-project
https://docs.mulesoft.com/mule-runtime/4.3/java-module-reference#invoke-java-code
Question # 3
A Mule implementation uses a HTTP Request within an Unit Successful scope to connect to an API. How should a permanent error response like HTTP:UNAUTHORIZED be handle inside Until Successful to reduce latency? | | A. Configure retrying until a MULERETRY_EXHAUSTED error is raised or the API responds back with a successful response. | | B. In Until Successful configuration, set the retry count to 1 for error type HTTP: UNAUTHORIZED. | | C. Put the HTTP Request inside a try scope in Unit Successful.
In the error handler, use On Error Continue to catch permanent errors like HTTP UNAUTHORIZED. | | D. Put the HTTP Request inside a try scope in Unit Successful.
In the error handler, use On Error Propagate to catch permanent errors like HTTP UNAUTHORIZED. |
C. Put the HTTP Request inside a try scope in Unit Successful.
In the error handler, use On Error Continue to catch permanent errors like HTTP UNAUTHORIZED.
Explanation:
To handle a permanent error response like HTTP:UNAUTHORIZED inside Until Successful, the developer should put the HTTP Request inside a try scope in Unit Successful, and use On Error Continue to catch permanent errors like HTTP UNAUTHORIZED in the error handler. This way, the developer can avoid retrying requests that will always fail due to a permanent error, and reduce latency. On Error Continue allows the flow to continue processing after handling the error.
References:
https://docs.mulesoft.com/mule-runtime/4.3/until-successful-scope
https://docs.mulesoft.com/mule-runtime/4.3/on-error-continue-concept
Question # 4
Which statement is true when using XML SDK for creating custom message processors? | | A. Properties are fields defined by an end user of the XML SDK component and serve as a global configuration for the entire Mule project in which they are used | | B. An XML SDK provides both inbound and outbound operations | | C. Operations can be reused in recursive calls | | D. All operations are public |
D. All operations are public
Explanation:
When using XML SDK for creating custom message processors, all operations are public by default and can be used by any Mule application that imports them. There is no way to make an operation private or protected in XML SDK.
References: https://docs.mulesoft.com/mule-sdk/1.1/xml-sdk#operations
Question # 5
Which pattern can a web API use to notify its client of state changes as soon as they occur? | | A. HTTP Webhock | | B. Shared database trigger | | C. Schedule Event Publisher | | D. ETL data load |
Explanation:
A web API can use HTTP Webhook to notify its client of state changes as soon as they occur. A webhook is an HTTP callback that allows an API to send real-time notifications to another system or application when an event happens. The client registers a URL with the API where it wants to receive notifications, and then the API sends an HTTP request to that URL with information about the event.
References:
https://docs.mulesoft.com/connectors/webhook/webhook-connector
Question # 6
Which pattern should be used to invoke multiple HTTP APIs in parallel and roll back failed requests in sequence? | | A. A database as a transactional outbox and an Until Successful router to retry any requests | | B. A Parallel for Each scope with each HTTP request wrapped in a Try scope | | C. Scatter-Gather as central Saga orchestrator for all API request with compensating actions for failing routes | | D. VM queues as a reliability pattern with error handlers to roll back any requests |
C. Scatter-Gather as central Saga orchestrator for all API request with compensating actions for failing routes
Explanation:
To invoke multiple HTTP APIs in parallel and roll back failed requests in sequence, the developer should use a Scatter-Gather router as a central Saga orchestrator for all API requests with compensating actions for failing routes. A Scatter-Gather router executes multiple routes concurrently and aggregates the results. A Saga orchestrator coordinates a series of actions across different services and handles failures by executing compensating actions. Therefore, using a Scatter-Gather router as a Saga orchestrator allows invoking multiple HTTP APIs in parallel and rolling back any failed requests in sequence.
References:
https://docs.mulesoft.com/mule-runtime/4.3/scatter-gather-concept
https://docs.mulesoft.com/mule-runtime/4.3/saga
Question # 7
A Mule application includes a subflow containing a Scatter.Gather scope. Within each log of the Scatter.Gatter. an HTTP connector calls a PUT endpoint to modify records in different upstream system. The subflow is called inside an Unit successful scope to retry if a transitory exception is raised. A technical spike is being performed to increase reliability of the Mule application. Which steps should be performed within the Mule flow above the ensure idempontent behavior? | | A. Change the PUT requests inside the Scatter-Gather to POST requests | | B. Ensure an error-handling flow performs corrective actions to roll back all changes if any leg of the Scatter-Gather fails | | C. Remove the Put requests from the Scatter-Getter and perform them sequentially | | D. None, the flow already exhibits idempotent behavior |
B. Ensure an error-handling flow performs corrective actions to roll back all changes if any leg of the Scatter-Gather fails
To ensure idempotent behavior within a Mule flow that contains a subflow with a Scatter-Gather scope, the developer should ensure an error-handling flow performs corrective actions to roll back all changes if any leg of the Scatter-Gather fails. Idempotency means that multiple identical requests have the same effect as a single request. Therefore, if one of the HTTP requests inside the Scatter-Gather fails, the error-handling flow should undo any changes made by other successful requests to ensure consistency and avoid partial updates.
References:
https://docs.mulesoft.com/mule-runtime/4.3/scatter-gather-concept
https://docs.mulesoft.com/mule-runtime/4.3/error-handling
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