CCAO-F Using the Claude API Practice Question
Which HTTP header is required in every request to the Claude API to specify the version of the API being used?
⚠ Common exam trap
Candidates often forget the 'anthropic-version' header entirely or use an incorrect date format, causing the API to reject the request due to missing version context.
Answer choices
Why each option matters
Answer the question above first, then reveal the full breakdown to understand why each option is right or wrong.
Correct answer & explanation
✓
anthropic-version
The 'anthropic-version' header is a mandatory requirement for all requests to the Claude API. It ensures that the client is compatible with the specific API versioning schema and allows Anthropic to introduce updates or breaking changes without affecting older implementations. Without this header, the API will return an error because it cannot determine which schema to validate the request against.
Answer analysis
Option-by-option breakdown
For each option: why learners choose it and why it is or isn't the right answer here.
- ✗
API-Version
Why it's wrong here
While 'API-Version' is a common naming convention in other web services, it is not the specific header name used by Anthropic. Using the wrong header name will lead to the API rejecting the request, as it specifically looks for the 'anthropic-version' key to identify the intended protocol version.
- ✓
anthropic-version
Why this is correct
This is the correct, mandatory header. As of the current documentation, the value '2023-06-01' is frequently used. This header allows the developer to pin their application to a specific version of the API, ensuring stability even as Anthropic evolves the platform and adds new features or parameters.
- ✗
X-Claude-Version
Why it's wrong here
This is an incorrect header name. Developers might mistakenly assume 'Claude' should be in the header name, but Anthropic uses its company name for the versioning header. Using 'X-Claude-Version' would result in a missing header error, as the API gateway specifically requires the 'anthropic-version' format.
- ✗
Accept-Version
Why it's wrong here
The 'Accept-Version' header is a standard HTTP header, but Anthropic does not use it for versioning its API. Instead, they require the custom 'anthropic-version' header. Relying on standard headers that are not explicitly documented by the provider will cause the request to fail during the initial validation phase.
About these practice questions
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JA
Written and reviewed by Johnson Ajibi, MSc IT Security
Senior Network & Security Engineer · founder of Courseiva
Last reviewed September 2026 · checked against the official Anthropic exam blueprint
This CCAO-F practice question is part of Courseiva's free Anthropic certification practice question bank. Courseiva provides original exam-style practice questions with explanations, topic-based practice, mock exams, readiness tracking, and study analytics to help learners prepare for the CCAO-F exam.