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You configured a POST method on a resource but clients receive a 403 Forbidden error. What is the most likely cause?

medium📝 Debug Q6 of 15
AWS - API Gateway
You configured a POST method on a resource but clients receive a 403 Forbidden error. What is the most likely cause?
AThe method requires authorization but none was provided
BThe resource path is incorrect
CThe API Gateway is not deployed
DThe HTTP method is not supported by API Gateway
Step-by-Step Solution
Solution:
  1. Step 1: Analyze 403 Forbidden meaning

    403 indicates the client is not authorized to access the method.
  2. Step 2: Check authorization settings on method

    If the method requires authorization (like IAM or Cognito) and client sends none, 403 is returned.
  3. Final Answer:

    The method requires authorization but none was provided -> Option A
  4. Quick Check:

    403 = missing authorization [OK]
Quick Trick: 403 means authorization missing or denied [OK]
Common Mistakes:
  • Assuming 403 means wrong resource path
  • Thinking API not deployed causes 403
  • Believing API Gateway doesn't support method

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