The correct answer is the HTTP Headers tab within the REST message definition. This is because custom headers like 'X-API-Key' are part of the HTTP request metadata, not the payload or URL, and the HTTP Headers tab is specifically designed to define key-value pairs that are automatically appended to every request sent to that endpoint. On the ServiceNow Certified Application Developer CAD exam, this question tests your understanding of where to configure custom headers in REST message definitions, a common integration task. A frequent trap is confusing the HTTP Headers tab with the Authentication profile or query parameters—remember, authentication credentials go in the Authentication tab, while static metadata like API keys belong in the HTTP Headers tab. For a quick memory tip: think of the HTTP Headers tab as the “sticky note” for every request—anything you write there, like an API key, gets attached automatically to every call.
SNOW-CAD Platform Features and Integration Practice Question
This SNOW-CAD practice question tests your understanding of platform features and integration. This is a configuration task: choose the command set that satisfies every stated requirement. Small differences — like 'secret' vs 'password' or 'transport input ssh' vs 'all' — change whether the answer is correct. After answering, compare your reasoning against the explanation and wrong-answer breakdown below. Once you have made your selection, read the full explanation to reinforce the concept and understand why each distractor is designed to mislead on exam day.
A ServiceNow developer is integrating with an external system using a REST message. The external system requires a custom header 'X-API-Key' to be included in every request. Where should the developer configure this header to ensure it is automatically included in all REST messages that call this endpoint?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
In the 'HTTP Headers' tab of the REST message definition
Option B is correct because the 'HTTP Headers' tab in a REST message definition allows you to define custom headers that are automatically included in every request sent to that endpoint. This is the standard location for headers like 'X-API-Key' that must accompany all calls, as they are part of the HTTP request metadata, not query parameters or authentication credentials.
Key principle: Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
✗
In the 'Query Parameters' tab of the REST message definition
Why it's wrong here
Query parameters are part of the URL query string, not HTTP headers.
✓
In the 'HTTP Headers' tab of the REST message definition
Why this is correct
Correct: Custom headers are defined here and automatically included in every request.
Related concept
Read the scenario before looking for a memorised answer.
✗
In the 'Authentication Profile' associated with the REST message
Why it's wrong here
Authentication profiles handle credentials like OAuth tokens, not custom headers.
✗
In the Scripted REST API used to create the endpoint
Why it's wrong here
Scripted REST APIs are for building endpoints that receive requests, not for outbound calls.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates confuse HTTP headers with query parameters or authentication profiles, assuming that custom API keys can be passed as query strings or handled by authentication mechanisms, when in fact they must be explicitly defined in the HTTP Headers tab of the REST message.
Detailed technical explanation
How to think about this question
Under the hood, the REST message definition in ServiceNow uses the 'HTTP Headers' tab to populate the headers map in the underlying HTTP request object (e.g., GlideHTTPRequest). This ensures that headers like 'X-API-Key' are sent with every call without requiring manual injection in scripts. A real-world scenario is when integrating with a third-party API that enforces API key validation via a custom header; failing to configure it here would result in 401 Unauthorized responses, and the developer would need to debug by checking the HTTP request logs in the system.
KKey Concepts to Remember
Read the scenario before looking for a memorised answer.
Find the constraint that changes the correct option.
Eliminate answers that are true in general but not in this case.
TExam Day Tips
→Watch for words such as best, first, most likely and least administrative effort.
→Review why wrong options are wrong, not only why the correct option is correct.
Key takeaway
Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option.
Real-world example
How this comes up in practice
A practitioner preparing for the SNOW-CAD exam encounters this exact type of scenario on the job. The correct answer here is not the most general option — it is the best answer for the specific constraint described. Answer the scenario, not the keyword: identify the specific constraint before choosing the most familiar-sounding option. Real exam questions reward reading the full scenario before eliminating options, because the constraint defines which answer fits.
What to study next
Got this wrong? Here's your next step.
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
Platform Features and Integration — This question tests Platform Features and Integration — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: In the 'HTTP Headers' tab of the REST message definition — Option B is correct because the 'HTTP Headers' tab in a REST message definition allows you to define custom headers that are automatically included in every request sent to that endpoint. This is the standard location for headers like 'X-API-Key' that must accompany all calls, as they are part of the HTTP request metadata, not query parameters or authentication credentials.
What should I do if I get this SNOW-CAD question wrong?
Identify which exam domain this question belongs to, review the core concept, then practise similar questions from the same domain.
What is the key concept behind this question?
Read the scenario before looking for a memorised answer.
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Question Discussion
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