Retrofit & OkHttp - Is it possible to send only one request at a time?

Question

I am using Retrofit 2.4.0 to send requests to a server. But sometimes server blocking my request if it has a similar timestamp in milliseconds with another request. I need to send request one at a time:

1. Request A is sent
2. Request B waits until the response for Request A received
3. Request A completes with success or error
4. Request B is sent

Is it possible to create such queue with Retrofit and OkHttp libraries?

Answer 1

I decided to use Dispatcher's setMaxRequests method to send request one at a time:

Dispatcher dispatcher = new Dispatcher();
dispatcher.setMaxRequests(1);

OkHttpClient client = new OkHttpClient.Builder()
                .dispatcher(dispatcher)
                .build()

Answer 2

For your requirement, you can simply use Android AsyncTank and onPostExecute(). You can call your request B after getting the response of request A.

I feel no need to use Retrofit or OkHttp libraries. These libraries are useful when you send multiple requests at the same time.