Specify an API Request Contract
Check syntax, input contract and authorization before the permitted state change.
About 22 minutes, plus any extended practice
Supplied materials
- Paper and pencil; answers may also be spoken or typed.
- All cases, labels, numbers and rules are supplied on this page. No real account, private information or purchase is needed.
Learn the idea
An API contract describes accepted request fields, allowed operations and response meaning. A successful syntax parse does not establish authorization or a valid business operation. The paper contract permits a count update only after validation and access checks; it specifies failures before any write.
Check syntax, input contract and authorization before the permitted state change. A200-like response label cannot replace verification of the saved result.
Use this supplied case: Determine whether the body has readable structured syntax. Which check or operation is described? The task is to connect the given information to the computing idea. Write a short evidence trail so another learner can reproduce your choice. The simplified case describes the stated model, not every real system.
- Represent the supplied worked case with a labeled drawing, table or short trace.
- Check syntax, input contract and authorization before the permitted state change.
- Explain why the worked answer fits and why one alternative does not.
- Try the new check and practice cases; revisit the stated rule if your evidence does not match.
See the method in action
Determine whether the body has readable structured syntax. Which check or operation is described? The supported answer is Parse structure. Check syntax, input contract and authorization before the permitted state change. A200-like response label cannot replace verification of the saved result. An API contract describes accepted request fields, allowed operations and response meaning.
Check your reasoning
Your answer is temporary and is not saved to an account. Download your current answer before leaving or reloading. Written work on paper or in another app stays in your own file.
Helpful tips
- Check syntax, input contract and authorization before the permitted state change.
- A200-like response label cannot replace verification of the saved result.
See the answer and explanation
Validate input
The supplied case states: Check count is an integer 0–20. Which check or operation is described? Under the stated distinction, this identifies Validate input. An API contract describes accepted request fields, allowed operations and response meaning. A successful syntax parse does not establish authorization or a valid business operation. The paper contract permits a count update only after validation and access checks; it specifies failures before any write. Check syntax, input contract and authorization before the permitted state change.
Take it further
Request count 21 violates integer 0–20 contract before any write. An unauthorized request with valid count still fails a separate permission check.
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More practice: try new cases
Choose an answer for each problem. Explain your method on paper, then use the feedback to decide what to revisit.
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Check the subject sources
These LifeStarter passages, scenarios and exercises are authored for this Academy with AI assistance and review. External resources keep their publishers’ terms. A grade label suggests a starting level; it does not establish alignment with your school’s complete requirements.