The answer is the set-header policy. This policy is correct because it allows you to add the X-API-Key header to inbound requests using the {{NamedValue}} syntax, which securely references a secret stored in Azure API Management without ever exposing the raw key to API consumers. On the AZ-204 exam, this scenario tests your understanding of how to handle backend authentication secrets safely, often appearing as a trap where candidates mistakenly choose a policy like validate-jwt or choose to pass the key via query parameters, which would leak the secret. The key insight is that named values are resolved server-side within the APIM gateway, so the consumer never sees the actual value. A simple memory tip: think "set-header for secrets" — the set-header policy is your go-to tool for injecting hidden backend credentials, while named values keep them out of sight.
AZ-204 Practice Question: Connect to and consume Azure services and third-party services
This AZ-204 practice question tests your understanding of connect to and consume azure services and third-party services. 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.
You manage a set of APIs using Azure API Management (APIM). One backend API requires an API key passed in the 'X-API-Key' header. The API key is stored securely in a named value in APIM. You need to configure APIM to add this header to all requests to that backend without exposing the key to API consumers. Which policy should you add to the inbound processing for that API?
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
set-header
The 'set-header' policy in Azure API Management allows you to add, modify, or remove HTTP headers on requests or responses. By placing this policy in the inbound processing section, you can inject the 'X-API-Key' header with the value retrieved from a named value (using the '{{NamedValue}}' syntax) without exposing the key to API consumers, as the policy executes on the gateway side.
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.
✗
set-backend-service
Why it's wrong here
This policy is used to change the backend endpoint URL, not to modify request headers.
✓
set-header
Why this is correct
The set-header policy can add the X-API-Key header with the value from a named value, keeping the key secure and hidden from consumers.
Related concept
Read the scenario before looking for a memorised answer.
✗
authentication-basic
Why it's wrong here
This policy adds HTTP Basic Authentication credentials, not a custom header. It also requires a username and password, not an API key.
✗
validate-jwt
Why it's wrong here
This policy validates a JWT token but does not add any headers to the backend request.
Common exam traps
Common exam trap: answer the scenario, not the keyword
The trap here is that candidates often confuse 'set-header' with 'authentication-basic' because both deal with adding authentication-related headers, but 'authentication-basic' specifically encodes credentials in Base64 and is intended for HTTP Basic Auth, not for arbitrary API key headers.
Detailed technical explanation
How to think about this question
Named values in APIM are encrypted at rest and can be referenced in policies using the '{{Name}}' syntax. The 'set-header' policy can also conditionally set headers based on context variables or expressions, and it supports multiple header values. In a real-world scenario, you might combine this with a 'check-header' policy to ensure the consumer does not pass their own 'X-API-Key' header, preventing override or injection attacks.
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 company's IT admin needs to give a contractor read-only access to production logs without sharing account credentials. Using role-based access control (RBAC) and temporary scoped permissions — not a permanent shared password — is the correct pattern. Questions like this test whether you can apply least-privilege access across cloud identity services.
Related glossary terms
Concepts from this question explained
These glossary pages explain the core terms tested in this AZ-204 question in full detail.
Connect to and consume Azure services and third-party services — This question tests Connect to and consume Azure services and third-party services — Read the scenario before looking for a memorised answer..
What is the correct answer to this question?
The correct answer is: set-header — The 'set-header' policy in Azure API Management allows you to add, modify, or remove HTTP headers on requests or responses. By placing this policy in the inbound processing section, you can inject the 'X-API-Key' header with the value retrieved from a named value (using the '{{NamedValue}}' syntax) without exposing the key to API consumers, as the policy executes on the gateway side.
What should I do if I get this AZ-204 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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