Q:

c# make http call to service on premise (behind firewall) using Azure Service Bus

I have a REST service on premise behind firewall, etc. The service is not exposed to the internet. I need to connect securely to that service from the internet.
I am wondering if Azure Service Bus can pass a HTTP Request to a service and return the HTTP Response?
Something like in this horible image bellow.

WCF Service Bus Client Service installed on premise
Server running in Azure

The server in Azure can issue HTTP request to custom url in premise like: http://intranet.domain.com by using Service Bus Relay.
Is this scenario possible?

A:

You can use Hybrid connections which are a feature of Azure BizTalk Services. This lets your Azure Web or Mobile App access any on-premise resource  that uses a static TCP port, such as SQL Server, HTTP Web APIs etc.
You need to install a listener agent on-premise that can connect to the machine that is running the REST service and the communication happens over a secure connection between the on-premise service and the Azure web app.

Hybrid connections overview
Setting up a hybrid connection

