Describe How to Use System Classes to Integrate with SOAP- or REST-based Web Services. PLATFORM-DEVELOPER-II Practice Questions (Page 4)

Questions 16–20

1. 16foundation · easy

   Which of the following is a valid way to authenticate an HTTP callout to an external service that uses OAuth 2.0?

   • AInclude the username and password in the URL
   • BUse the setClientId method on HttpRequest
   • CSet the Authorization header to 'Bearer <access_token>'
   • DSet the Session ID in the request body
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2. 17application · medium

   A developer is implementing a REST callout that can fail due to rate limiting (HTTP 429). The response includes a 'Retry-After' header. What is the best way to handle this in Apex?

   • AIgnore the 429 error and move on.
   • BUse a batch Apex job to retry immediately.
   • CRead the 'Retry-After' header and schedule a retry after that delay.
   • DImmediately retry the callout in a loop.
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4. 18application · medium

   A developer is integrating Salesforce with an external REST API that requires an OAuth 2.0 bearer token. The token is obtained from a separate authentication endpoint and expires every hour. The developer needs to make a callout from an Apex class to fetch customer data. What is the recommended approach to handle the token?

   • AStore the token in a custom setting and refresh it manually when it expires.
   • BUse a Named Credential with the authentication endpoint and let Salesforce manage the token lifecycle.
   • CUse a Private Endpoint to securely store the token and retrieve it in Apex.
   • DHardcode the token in the Apex class and update the code when it expires.
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5. 19application · medium

   A developer is using WSDL2Apex to integrate with a SOAP service. The service returns a custom exception that needs to be handled gracefully. What is the best way to handle this in Apex?

   • ACatch the specific exception class generated by WSDL2Apex.
   • BUse the System.debug to print the exception and continue.
   • CUse a try-catch block that ignores the exception.
   • DCatch the generic Exception class and log the error.
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6. 20expert · medium

   A developer is making a REST callout to an external API that requires a digital signature in the request header. The signature is based on the request body and a secret key. What is the best way to implement this in Apex?

   • AUse a Named Credential to store the secret and let Salesforce generate the signature.
   • BHardcode the signature in the Apex class.
   • CUse a Platform Event to send the signature.
   • DUse the Crypto class to generate the signature and set it in the header.
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