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Hi, Thank you for using AWS re:Post
The reason why the load balancer sends you the HTTP 414: URI too long error is because the request URL or query string parameters are too large [1].
In order to fix this, we can try enabling client secret for the application in AWS Cognito [2].
Please keep in mind that if the ARN length exceeds the 1600 bytes limit it could also cause this error [3].
Here are additional articles that might be helpful:
[2] https://docs.aws.amazon.com/cognito/latest/developerguide/user-pool-settings-client-apps.html
[3] https://docs.aws.amazon.com/apigateway/latest/developerguide/limits.html
answered 2 years ago
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