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A server returns a 406 Not Acceptable error. What is the most likely cause related to content negotiation?

medium📝 Debug Q14 of 15
Rest API - Request and Response Format
A server returns a 406 Not Acceptable error. What is the most likely cause related to content negotiation?
AServer failed to authenticate the client
BClient requested a format the server cannot provide
CClient sent an invalid HTTP method
DServer ran out of memory
Step-by-Step Solution
Solution:

  1. Step 1: Understand HTTP 406 status meaning

    406 means server cannot provide a response matching the Accept header.

  2. Step 2: Link 406 to content negotiation failure

    If client requests unsupported format, server responds 406 Not Acceptable.

  3. Final Answer:

    Client requested a format the server cannot provide -> Option B

  4. Quick Check:

    406 = unsupported requested format [OK]
Quick Trick: 406 means no matching format found for Accept header [OK]
Common Mistakes:
  • Confusing 406 with authentication errors
  • Thinking 406 means server error
  • Assuming 406 is about HTTP methods

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