Greetings, we are currently working on converting ...

# apollo-kotlin

[Frank Sullivan]

Greetings, we are currently working on converting from our custom GraphQL client (based on OkHttp) to ApolloClient. 🧵

[Frank Sullivan]

We have a tremendous number of OkHttp Interceptors that I'd like to continue using if possible (as opposed to converting them to ApolloInterceptors or Apollo HttpInterceptors). I understand that I can use the same OkHttpClient, but one problem I'm running into is that many of these Interceptors are checking for tags on the OkHttp Request.

I know that ApolloClient has the ExecutionContext, which is similar to tags, however I don't think that will work because of this series of conversions:

ApolloRequest -> Apollo HttpRequest -> OkHttp Request

The Apollo HttpRequest does not have a concept similar to tags and so even if I were to override the HttpRequestComposer or even the Engine, I would not be able to carry the ExecutionContext over to the OkHttpRequest.

Currently the idea to beat is to have some special header that I can parse on the OkHttp side with an OkHttp Interceptor that is upstream of the others. This doesn't feel great, though

I was curious if anyway had a better idea by chance?

[bod]

If you want to pass some information from your code to an OkHttpInterceptor "through" Apollo, Http headers is also what comes to mind - can't think of any other way at the moment.

Mind telling us a bit more about what information you need passing?

[Frank Sullivan]

Sure, I'm auditing it right now. So far, nothing that would be too difficult to serialize into a header. Mostly just flags and options for some of our custom OkHttp Interceptors

[yschimke]

It doesn't solve your problem, but if you want some custom handling for all Calls via Apollo, consider putting logic in a custom Call.Factory that decorates the OkHttpClient. You can take the headers and change back to tags before it ever gets to OkHttpClient

[yschimke]

Also useful if you have context available via thread locals, as it's on callers thread