Backport #2686 to 1.x-WorkingBranch

[delarocka]

Prerequisites

• I have written a descriptive pull-request title
• I have verified that there are no overlapping pull-requests open
• I have verified that I am following the Nancy code style guidelines
• I have provided test coverage for my change (where applicable)

Description

The call to Task.Wait() causes a deadlock on many concurrent requests. This changes the method to do a synchronous copy instead.

Fixes #2781

[delarocka]

"The command 'sudo apt-get update' failed and exited with 100 during". Seems like a problem with CI machine, can i somehow restart a build?

[phillip-haydon]

I restarted it, failed with same error :( i donno what it's doing or why it's failing so someone started than me will need to look at it.

[cguedel]

Any reason why this was not yet merged to 1.x with a new release?

[delarocka]

There was errors on CI build not related to code:
The command "sudo apt-get update" failed and exited with 100 during .