apollo-server: Apollo 2 serverless giving 403

I followed this tutorial https://www.apollographql.com/docs/apollo-server/deployment/lambda.html and when i hit api endpoint, i get following error

“error”: “Response not successful: Received status code 403”

Here is my code graphql.js

`const { ApolloServer, gql } = require(‘apollo-server-lambda’);

// Construct a schema, using GraphQL schema language const typeDefs = gql type Query { hello: String };

// Provide resolver functions for your schema fields const resolvers = { Query: { hello: () => ‘Hello world!’, }, };

const server = new ApolloServer({ typeDefs, resolvers, context: ({ event, context }) => ({ headers: event.headers, functionName: context.functionName, event, context, }), introspection: true, playground: true, });

exports.graphqlHandler = server.createHandler({ cors: { origin: ‘*’, credentials: true, }, });`

My function definition looks like following functions: graphql: handler: src/graphql.graphqlHandler environment: SLS_DEBUG: true events: - http: path: graphql method: post cors: true integration: lambda-proxy graphiql: handler: src/graphql.graphqlHandler events: - http: path: graphiql method: get integration: lambda-proxy

When i hit my API endpoint https://hu0pzhs59i.execute-api.us-east-1.amazonaws.com/dev/graphiql gives error