I have created a simple lambda function in AWS that returns list from DynamoDB. I have also created API Gateway to trigger the lambda function. The function works fine when I test in AWS console. But I always get 502 bad gateway below error when I test this function in Postman. ({ "message": "Internal server error" }
Below is the function in node.js:
const doc = require('dynamodb-doc'); const dynamo = new doc.DynamoDB(); /** * Provide an event that contains the following keys: * * - operation: one of the operations in the switch statement below * - tableName: required for operations that interact with DynamoDB * - payload: a parameter to pass to the operation being performed */ exports.handler = async (event) => { const operation = event.operation; const payload = event.payload; if (event.tableName) { payload.TableName = event.tableName; } switch (operation) { case 'create': return await dynamo.putItem(payload).promise(); case 'read': return await dynamo.getItem(payload).promise(); case 'update': return await dynamo.updateItem(payload).promise(); case 'delete': return await dynamo.deleteItem(payload).promise(); case 'list': return await dynamo.scan(payload).promise(); case 'echo': return payload; case 'ping': return 'pong'; default: throw new Error(`Unrecognized operation "${operation}"`); } }; Below is generated API Gateway Endpoint details.
API endpoint: https://iabzqisam7.execute-api.us-east-1.amazonaws.com/test/moneyAppDynamoDBOperationsLambda Authorization: NONE Method: ANY Resource path: /moneyAppDynamoDBOperationsLambda Stage: test Here is how I am trying to test API using Postman:
Postman URL(Get) : https://iabzqisam7.execute-api.us-east-1.amazonaws.com/test/moneyAppDynamoDBOperationsLambda Headers: Key: content-type, Value: application/json Body (raw) : { "operation": "list", "tableName": "Advertiser", "payload": { "TableName": "Advertiser" } } It works perfectly fine within AWS console.
Any idea why I am keep getting 502 bad gateway error while calling API Gateway from Postman ?
