[Solved] Given this CORS configuration snippet for an S3 bucket: { "CORSRules": [ { "AllowedOrigins": ["https://example.com"], "AllowedMethods": ["GET"], "AllowedHeaders": ["*"], "MaxAgeSeconds":... | AWS

AWS - API Gateway

Given this CORS configuration snippet for an S3 bucket:

{
  "CORSRules": [
    {
      "AllowedOrigins": ["https://example.com"],
      "AllowedMethods": ["GET"],
      "AllowedHeaders": ["*"],
      "MaxAgeSeconds": 3000
    }
  ]
}

What will happen if a browser from https://example.com sends a POST request to this bucket?

AThe POST request will succeed because MaxAgeSeconds is set.

BThe POST request will succeed because AllowedHeaders is '*'.

CThe POST request will be redirected to GET automatically.

DThe POST request will be blocked due to method not allowed.

Step-by-Step Solution

Solution:

Step 1: Check AllowedMethods in CORS configuration
Only GET method is allowed from https://example.com.
Step 2: Understand effect on POST request
POST is not in AllowedMethods, so the browser will block the request due to CORS policy.
Final Answer:
The POST request will be blocked due to method not allowed. -> Option D
Quick Check:
AllowedMethods=GET only, POST blocked [OK]

Quick Trick: AllowedMethods must include the request method [OK]

Common Mistakes:

MISTAKES

Confusing AllowedHeaders with AllowedMethods
Thinking MaxAgeSeconds affects allowed methods
Assuming POST auto-converts to GET

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Given this CORS configuration snippet for an S3 bucket:

Step 1: Check AllowedMethods in CORS configuration

Step 2: Understand effect on POST request

Final Answer:

Quick Check:

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