I am new to .Net Core 2 and having problems trying to access (in this specific case, but will need to access other Api's in time) Azure AD with a fresh .Net Core 2 Visual Studio 2017 MVC web app.
I am getting
HttpRequestException: Response status code does not indicate success: 407 (Proxy Authentication Required ( The ISA Server requires authorization to fulfill the request. Access to the Web Proxy filter is denied. )).
Which basically means that our corporate proxy server is not receiving the credentials needed to pass through ISA server.
As we nor our clients have no control over our/their corporate proxy server, or in clients case, machine configurations as everything is locked down, its always been up to our apps to supply the correct credentials that ISA needed. With ASP.Net its been just a matter of adding the following to app.config or web.config which obviously do not exist in Core 2:
<system.net>
<defaultProxy useDefaultCredentials="true" />
</system.net>
I have proven, by running the equivalent non core version of the application, that this workaround should fix the problem.
However, with .Net Core 2, we have not found a way to implement this, either via middleware read configuration file, or programatically, ie in middleware say via WebProxy class/IWebProxy Interface, the latter has been tried but had no success - no evidence of the class instantiating in middleware.
I've seen comments in earlier versions of Core where people suggest implementing IWebProxy (no longer needed it seems as WebProxy class is available now) but no information how it gets hooked in.
How do we tell an .Net Core 2 MVC application to use default credentials when accessing the web?