[Solved] You wrote this test code but get a connection error. What is the likely cause?requests.post('http://localhost:9999/webhook', json={'event': 'test'}) | Rest API

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:

Step 1: Analyze connection error cause
Connection errors usually mean no server is listening at the address and port.
Step 2: Exclude other causes
Syntax errors cause exceptions, method not allowed returns HTTP error, missing auth returns 401, not connection error.
Final Answer:
No server is running on localhost port 9999 -> Option D
Quick Check:
Connection error = No server listening [OK]

Quick Trick: Connection errors mean server is not reachable at given address [OK]

Common Mistakes:

MISTAKES

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