iguanaman iguanaman - 2 months ago 28
Vb.net Question

Whats the difference between HttpClient.Timeout and using the WebRequestHandler timeout properties?

I can set the timeout of my

HttpClient
object directly with
HttpClient.Timeout
but I've recently read about the
WebRequestHandler
class which is a derivative of
HttpClientHandler
.

WebRequestHandler
has a
ReadWriteTimeout
property. How will this affect the operation of the request when used alongside
HttpClient.Timeout
?

Answer

When you perform a SendAsync the HttpClient.Timeout is placed on the CancellationTokenSource. This means this timeout is for the entire async operation.

On the other hand, WebRequestHandler.ReadWriteTimeout is copied to the HttpWebRequest where it is set on the request stream both ReadTimeout and WriteTimeout. So this is more a timeout at the stream level, which is ultimately a socket level timeout.

If you set both, then if the operation takes more than HttpClient.Timeout in total it will timeout, and if a read or write from the stream takes longer than WebRequestHandler.ReadWriteTimeout it will also timeout. Though I am not sure if there is a difference in the timeout exceptions raised.