While using proxy integration with API Gateway, API Gateway passes the HTTP request to the Lambda in a particular format. Similarly, API Gateway expects the output in a particular format. Refer to the recipe to see how most of these are used in Java code.

The input format is as follows:

{
 "resource": "The resource path",
 "path": "The path parameter",
 "httpMethod": "Incoming request's method name"
 "headers": {request headers}
 "queryStringParameters": {query string parameters }
 "pathParameters": {path parameters}
 "stageVariables": {Available stage variables}
 "requestContext": {Request context with authorizer-returned key-value pairs}
 "body": "A JSON string of the request payload."
 "isBase64Encoded": "A boolean flag that indicate if the applicable request payload is Base64-encoded"
}

The output format is as follows:

{
 "isBase64Encoded": true|false,
 "statusCode": httpStatusCode,
 "headers": { headerName: headerValue key value pairs },
 "body": "body content"
}