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Showing content from https://docs.aws.amazon.com/lambda/latest/api/API_GetFunction.html below:

GetFunction - AWS Lambda

GetFunction

Returns information about the function or function version, with a link to download the deployment package that's valid for 10 minutes. If you specify a function version, only details that are specific to that version are returned.

Request Syntax

GET /2015-03-31/functions/FunctionName?Qualifier=Qualifier HTTP/1.1

URI Request Parameters

The request uses the following URI parameters.

FunctionName

The name or ARN of the Lambda function, version, or alias.

Name formats

Function name â my-function (name-only), my-function:v1 (with alias).
Function ARN â arn:aws:lambda:us-west-2:123456789012:function:my-function.
Partial ARN â 123456789012:function:my-function.

You can append a version number or alias to any of the formats. 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 170.

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

Qualifier

Specify a version or alias to get details about a published version of the function.

Length Constraints: Minimum length of 1. Maximum length of 128.

Pattern: (|[a-zA-Z0-9$_-]+)

Request Body

The request does not have a request body.

Response Syntax

HTTP/1.1 200
Content-type: application/json

{
   "Code": { 
      "ImageUri": "string",
      "Location": "string",
      "RepositoryType": "string",
      "ResolvedImageUri": "string",
      "SourceKMSKeyArn": "string"
   },
   "Concurrency": { 
      "ReservedConcurrentExecutions": number
   },
   "Configuration": { 
      "Architectures": [ "string" ],
      "CodeSha256": "string",
      "CodeSize": number,
      "DeadLetterConfig": { 
         "TargetArn": "string"
      },
      "Description": "string",
      "Environment": { 
         "Error": { 
            "ErrorCode": "string",
            "Message": "string"
         },
         "Variables": { 
            "string" : "string" 
         }
      },
      "EphemeralStorage": { 
         "Size": number
      },
      "FileSystemConfigs": [ 
         { 
            "Arn": "string",
            "LocalMountPath": "string"
         }
      ],
      "FunctionArn": "string",
      "FunctionName": "string",
      "Handler": "string",
      "ImageConfigResponse": { 
         "Error": { 
            "ErrorCode": "string",
            "Message": "string"
         },
         "ImageConfig": { 
            "Command": [ "string" ],
            "EntryPoint": [ "string" ],
            "WorkingDirectory": "string"
         }
      },
      "KMSKeyArn": "string",
      "LastModified": "string",
      "LastUpdateStatus": "string",
      "LastUpdateStatusReason": "string",
      "LastUpdateStatusReasonCode": "string",
      "Layers": [ 
         { 
            "Arn": "string",
            "CodeSize": number,
            "SigningJobArn": "string",
            "SigningProfileVersionArn": "string"
         }
      ],
      "LoggingConfig": { 
         "ApplicationLogLevel": "string",
         "LogFormat": "string",
         "LogGroup": "string",
         "SystemLogLevel": "string"
      },
      "MasterArn": "string",
      "MemorySize": number,
      "PackageType": "string",
      "RevisionId": "string",
      "Role": "string",
      "Runtime": "string",
      "RuntimeVersionConfig": { 
         "Error": { 
            "ErrorCode": "string",
            "Message": "string"
         },
         "RuntimeVersionArn": "string"
      },
      "SigningJobArn": "string",
      "SigningProfileVersionArn": "string",
      "SnapStart": { 
         "ApplyOn": "string",
         "OptimizationStatus": "string"
      },
      "State": "string",
      "StateReason": "string",
      "StateReasonCode": "string",
      "Timeout": number,
      "TracingConfig": { 
         "Mode": "string"
      },
      "Version": "string",
      "VpcConfig": { 
         "Ipv6AllowedForDualStack": boolean,
         "SecurityGroupIds": [ "string" ],
         "SubnetIds": [ "string" ],
         "VpcId": "string"
      }
   },
   "Tags": { 
      "string" : "string" 
   },
   "TagsError": { 
      "ErrorCode": "string",
      "Message": "string"
   }
}

Response Elements

If the action is successful, the service sends back an HTTP 200 response.

The following data is returned in JSON format by the service.

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

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