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How do I troubleshoot HTTP 403 errors from API Gateway?

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How do I troubleshoot HTTP 403 errors from API Gateway?

For more details on this topic, visit the AWS Knowledge Center on AWS re:Post and read the full article associated with this video: https://repost.aws/knowledge-center/api-gateway-troubleshoot-403-forbidden

The AWS Knowledge Center contains trusted, expert-reviewed answers to frequently asked questions across AWS services — including EC2, S3, IAM, Lambda, Bedrock, and more.

Sahil shows you how to troubleshoot HTTP 403 forbidden errors that occur when calling APIs hosted on Amazon API Gateway.

0:00 Introduction
0:21 403 Forbidden Errors
0:47 API Gateway Setup
1:25 Error Characteristics
2:10 Root Causes
2:53 Resolving Issues
3:19 Browser Troubleshooting
4:12 Common Reasons
4:43 Correct API Invocation
5:15 Closing

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Date: November 11, 2025