使用自定义的HTTP客户端

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class MyHttpEngine(val wrappedClient: MyClient) : HttpEngine {
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  /**
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   * Helper function to map the Apollo requests to MyClient requests
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   */
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  private fun HttpMethod.toMyClientRequest(): MyClientRequest {
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    ...
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  }
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  /**
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   * And the other way around
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   */
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  private fun MyClientResponse.toApolloResponse(): HttpResponse {
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    ...
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  }
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  override suspend fun execute(request: HttpRequest) = suspendCancellableCoroutine { continuation ->
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    val call = wrappedClient.newCall(request.toMyClientRequest())
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    continuation.invokeOnCancellation {
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      // If the coroutine is cancelled, also cancel the HTTP call
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      call.cancel()
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    }
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    wrappedClient.enqueue(
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        call,
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        success = { myResponse ->
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          // Success! report the response
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          continuation.resume(myResponse.toApolloResponse())
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        },
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        error = { throwable ->
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          // Error. Wrap in an ApolloException and report the error
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          continuation.resumeWithException(ApolloNetworkException(throwable))
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        }
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    )
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  }
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  override fun close() {
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    // Dispose any resources here
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  }
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}

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// Use your HttpEngine
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val client = ApolloClient.Builder()
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  .serverUrl(serverUrl = "https://example.com/graphql")
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  .httpEngine(httpEngine = MyHttpEngine(wrappedClient))
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  .build()