I have a flow that creates request objects and then issues them using 
singleRequest. The flow works fine, however, I encounter 

Response exception: 
akka.stream.BaseOverflowStrategy$Fail$BufferOverflowException: Exceeded 
configured max-open-requests value of [32]
Response exception: 
akka.stream.BaseOverflowStrategy$Fail$BufferOverflowException: Exceeded 
configured max-open-requests value of [32]
Response exception: 
akka.stream.BaseOverflowStrategy$Fail$BufferOverflowException: Exceeded 
configured max-open-requests value of [32]
Response exception: 
akka.stream.BaseOverflowStrategy$Fail$BufferOverflowException: Exceeded 
configured max-open-requests value of [32]
Response exception: 
akka.stream.BaseOverflowStrategy$Fail$BufferOverflowException: Exceeded 
configured max-open-requests value of [32]
Response exception: 
akka.stream.BaseOverflowStrategy$Fail$BufferOverflowException: Exceeded 
configured max-open-requests value of [32]
Response exception: 
akka.stream.BaseOverflowStrategy$Fail$BufferOverflowException: Exceeded 
configured max-open-requests value of [32]
Response exception: 
akka.stream.BaseOverflowStrategy$Fail$BufferOverflowException: Exceeded 
configured max-open-requests value of [32]
...

exceptions when pumping a large number of single requests through my flow, 
and hence a large number of "singleRequest" calls. Obviously, I could 
increase the configured amount, but its possible that I need to issue 
hundreds of single requests and could be quite variable so I could never 
set the amount to be large enough since I don't know the maximum value 
ahead of time.

I though that the underlying connection pool would have back pressure that 
bubbles up and keeps the request "queued" until a slot opens for the 
request to be executed, and hence, complete my future result returned from 
singleRequest once it is run.

But I am getting these errors so this does not appear to work the way I 
thought it would.

Do I need to configure my flow differently and have it be aware of the 
max-open-request limit in some way?

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