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You wrote this test code but get a 405 Method Not Allowed error. What is the likely cause?

medium📝 Debug Q6 of 15
Flask - Testing Flask Applications
You wrote this test code but get a 405 Method Not Allowed error. What is the likely cause? 
response = client.get('/submit', data={'name': 'Bob'})
AThe route '/submit' only accepts POST, but GET was used
BThe data parameter is invalid for GET requests
CThe test client is not initialized
DThe form data is missing a required field
Step-by-Step Solution
Solution:

  1. Step 1: Understand HTTP method restrictions

    If the route '/submit' only allows POST, sending a GET request causes a 405 error.

  2. Step 2: Analyze the test code

    The test uses client.get() with data, which is invalid if the route expects POST.

  3. Final Answer:

    The route '/submit' only accepts POST, but GET was used -> Option A

  4. Quick Check:

    405 error = wrong HTTP method [OK]
Quick Trick: Use correct HTTP method matching route to avoid 405 errors [OK]
Common Mistakes:
MISTAKES
  • Using GET instead of POST for form submission
  • Assuming data= works with GET
  • Not checking route method restrictions

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