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You wrote this test code but get a connection error. What is the likely cause?

medium📝 Debug Q6 of 15
Rest API - Webhooks and Events
You wrote this test code but get a connection error. What is the likely cause?
requests.post('http://localhost:9999/webhook', json={'event': 'test'})
ASyntax error in JSON payload
BMissing authentication headers
CPOST method is not allowed
DNo server is running on localhost port 9999
Step-by-Step Solution
Solution:
  1. Step 1: Analyze connection error cause

    Connection errors usually mean no server is listening at the address and port.
  2. Step 2: Exclude other causes

    Syntax errors cause exceptions, method not allowed returns HTTP error, missing auth returns 401, not connection error.
  3. Final Answer:

    No server is running on localhost port 9999 -> Option D
  4. Quick Check:

    Connection error = No server listening [OK]
Quick Trick: Connection errors mean server is not reachable at given address [OK]
Common Mistakes:
MISTAKES
  • Confusing connection errors with HTTP errors
  • Assuming JSON syntax causes connection failure

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