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Showing content from https://docs.aws.amazon.com/lambda/latest/dg/API_DeleteFunctionConcurrency.html below:

DeleteFunctionConcurrency

Removes a concurrent execution limit from a function.

Request Syntax

DELETE /2017-10-31/functions/FunctionName/concurrency HTTP/1.1

URI Request Parameters

The request uses the following URI parameters.

The name or ARN of the Lambda function.

Name formats

Function name â my-function.
Function ARN â arn:aws:lambda:us-west-2:123456789012:function:my-function.
Partial ARN â 123456789012:function:my-function.

The length constraint applies only to the full ARN. If you specify only the function name, it is limited to 64 characters in length.

Length Constraints: Minimum length of 1. Maximum length of 140.

Pattern: (arn:(aws[a-zA-Z-]*)?:lambda:)?([a-z]{2}(-gov)?-[a-z]+-\d{1}:)?(\d{12}:)?(function:)?([a-zA-Z0-9-_]+)(:(\$LATEST|[a-zA-Z0-9-_]+))?

Required: Yes

Request Body

The request does not have a request body.

Response Syntax

HTTP/1.1 204

Response Elements

If the action is successful, the service sends back an HTTP 204 response with an empty HTTP body.

Errors

For information about the errors that are common to all actions, see Common Errors.

InvalidParameterValueException

One of the parameters in the request is not valid.

HTTP Status Code: 400

ResourceConflictException

The resource already exists, or another operation is in progress.

HTTP Status Code: 409

ResourceNotFoundException

The resource specified in the request does not exist.

HTTP Status Code: 404

ServiceException

The AWS Lambda service encountered an internal error.

HTTP Status Code: 500

TooManyRequestsException

The request throughput limit was exceeded. For more information, see Lambda quotas.

HTTP Status Code: 429