URL validation is where string checks fail most visibly. The scored answer parses, resolves and allowlists, then tests the classic bypasses.
Make your first attempt
What would you say before reading the answer?
- 01 State the assumptions your answer depends on.
- 02 Explain the mechanism and choose a control.
- 03 Name a condition that would change your decision.
The worked answer includes an approach, scoring criteria and follow-up questions. Compare the reasoning with your own.
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