APIGatewayProxyResult

APIGatewayProxyResult is a data structure used in AWS Lambda functions when they are integrated with Amazon API Gateway. It represents the response that a Lambda function will return to API Gateway, which then forwards it to the client that made the original HTTP request. This structure defines the components of an HTTP response.

The APIGatewayProxyResult typically includes several key fields. The statusCode field is mandatory and specifies the HTTP status code of the response, such as 200 for OK, 404 for Not Found, or 500 for Internal Server Error. The headers field is an object containing HTTP headers, such as 'Content-Type' or 'Access-Control-Allow-Origin'. The body field contains the actual response payload, which can be a string or a JSON object. It's important to note that the body should be properly encoded, often as a JSON string if the content type is application/json.

Additionally, APIGatewayProxyResult can include a isBase64Encoded field, which is a boolean indicating whether the body is Base64 encoded. This is particularly useful for binary data. Finally, there's a multiValueHeaders field, which is an object allowing for multiple headers with the same name, unlike the single value headers object. By correctly constructing and returning an APIGatewayProxyResult object from a Lambda function, developers can ensure that API Gateway receives and processes the response as expected, thereby providing the correct HTTP response to the end user.