Customized response example
You can customize some API Gateway error responses by defining response headers within your
AWS SAM template. To do this, you use the Gateway Response Object
The following is an example AWS SAM template that creates a customized response for the
DEFAULT_5XX
error.
AWSTemplateFormatVersion: '2010-09-09' Transform: AWS::Serverless-2016-10-31 Resources: MyApi: Type: AWS::Serverless::Api Properties: StageName: Prod GatewayResponses: DEFAULT_5XX: ResponseParameters: Headers: Access-Control-Expose-Headers: "'WWW-Authenticate'" Access-Control-Allow-Origin: "'*'" ErrorHeader: "'MyCustomErrorHeader'" ResponseTemplates: application/json: "{\"message\": \"Error on the $context.resourcePath resource\" }" GetFunction: Type: AWS::Serverless::Function Properties: Runtime: python3.10 Handler: index.handler InlineCode: | def handler(event, context): raise Exception('Check out the new response!') Events: GetResource: Type: Api Properties: Path: /error Method: get RestApiId: !Ref MyApi
For more information about API Gateway responses, see Gateway responses in API Gateway in the API Gateway Developer Guide.