# Cheatsheets

## ApolloWSOptions

Options for configuring the link.

Name | Type | Description
`@keepAlive` | `Number (long)` | Set the interval in milliseconds to send `KEEPALIVE` messages to all clients. Defaults to `30000`.

## GraphQLHandlerOptions

Options for configuring the link.

Name | Type | Description
`@requestBatchingEnabled` | `Boolean` | Whether request batching should be enabled. Defaults to `false`.

## GraphiQLHandlerOptions

Embedded GraphiQL user interface options.

Name | Type | Description
`@enabled` | `Boolean` | Whether the GraphiQL development tool should be enabled. Defaults to `false`.
`@graphQLUri` | `String` | Set the GraphQL endpoint URI. Defaults to the path used to get the GraphiQL user interface.
`@headers` | `String` | A fixed set of HTTP headers to add to GraphiQL requests. Defaults to `null`.
`@query` | `String` | Initial value of the query area in the GraphiQL user interface. Defaults to `null`.
`@variables` | `Json object` | Initial value of the variables area in the GraphiQL user interface. Defaults to `null`.