Best way to send to send HTTP Keep-Alive in RemoteGraphQLDataSource

[ehardy]

Hello,

Looking for some advice how to best send the HTTP Connection: Keep-Alive header when using RemoteGraphQLDataSource in a gateway context. RemoteGraphQLDataSource has a willSendRequest() method that can be overridden, I could set the header in there. Deep down, Apollo gateway uses node-fetch, which itself uses the http and https Node modules, would there be a way to customize the Agent with keepAlive as can be seen in Node's documentation?

Thanks

Etienne

[glasser]

You can configure the subgraph fetcher in your GraphQLDataSource to replace the default fetch call with your own fetch call. You can have your fetcher call node-fetch passing in an agent, for example.

[ehardy]

Looks promising! We're using an old version of @apollo/gateway and had not noticed this option, so will upgrade and try it out. Thanks.

[ehardy]

@glasser Confirm that your proposal works. Thanks!