HTTP connection pooling

[klaemo]

Hey there,
methods like batchCheck and listRelations can potentially issue a lot of individual requests. We noticed some rather severe performance issues which we narrowed down to each of those requests doing a new DNS lookup and TCP connection setup.

Once we enabled connection re-use/pooling/keep alive (whatever you want to call it) we saw big improvements.

http.globalAgent = new http.Agent({ keepAlive: true });
https.globalAgent = new https.Agent({ keepAlive: true });

I think this should either be the default for the SDK's axios instance, a parameter for the OpenFgaClient or the very least mentioned in the docs.

What do you think?

[rhamzeh]

Thanks for the feedback @klaemo!

Please feel free to submit a PR, both in the documentation and setting it as default in the code would be accepted.

Here is the relevant part of the code that instantiates axios if not provided: https://github.com/openfga/js-sdk/blob/main/base.ts#LL43C67-L43C67

Side-note: At some point we'd like to replace axios and move to a framework that allows http2/3 (see: #18), would love your feedback on that then!