Buffer: retry request time interval

[newsdy]

Can retry interval be configured? have this function?

[dustin-decker]

I also had this need. Added in #198.

[chzhuo]

Can retry timeout be configured? Retry several times, if the limit timeout is exceeded, break the request。

[dustin-decker]

Yes, you can configure the interval with the option that I added, but otherwise you have the buffer expression to use:

	buffer.Retry(`IsNetworkError() && Attempts() <= 2`),
	buffer.RetrySleep(time.Second))

That would do up to two attempts, sleeping for one second in between. You can set a request timeout with a custom transport provided to the load balancer middleware.