[Solved] You configured this CORS rule but your web app still gets CORS errors when sending POST requests:{"CORSRules": [{"AllowedOrigins": ["https://myapp.com"], "AllowedMethods":... | AWS

AWS - API Gateway

You configured this CORS rule but your web app still gets CORS errors when sending POST requests:

{"CORSRules": [{"AllowedOrigins": ["https://myapp.com"], "AllowedMethods": ["POST"]}]}

What is the likely missing configuration?

AAllowedHeaders including 'Content-Type'

BAllowedOrigins including '*' wildcard

CAllowedMethods including GET

DMaxAgeSeconds set to 0

Step-by-Step Solution

Solution:

Step 1: Understand CORS preflight
POST requests with custom headers require AllowedHeaders to include those headers.
Step 2: Identify missing AllowedHeaders
Without 'Content-Type' in AllowedHeaders, browser blocks the request.
Final Answer:
AllowedHeaders including 'Content-Type' -> Option A
Quick Check:
Missing AllowedHeaders causes CORS errors [OK]

Quick Trick: Include all custom headers in AllowedHeaders [OK]

Common Mistakes:

MISTAKES

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You configured this CORS rule but your web app still gets CORS errors when sending POST requests: