No proxy configuration to get MetadataLocation

[apondman]

Information

1. What nuget packages are you using

Sustainsys.Saml2.AspNetCore2, version 2.7.0

2. What is the expected behaviour

Connect to the given MetadataLocation and retrieve the metadata for an idp.

3. What happens instead. In the case of an exception, this includes the exception typ, complete exception message (personal information may be redacted) and a stack trace.

it's not possible to setup a proxy - on certain environments we can't directly connect to the metadata location because we need to use a proxy. Looking a the codebase the request is done using WebClient with no possible hook to setup additional proxy information.

[spaasis]

We got bit by this as well. @apondman did you manage to work around this?

[apondman]

No unfortunately.. I think we had some sort of metadata mirror setup for a while and I was about to fork and do some changes myself but "luckily" our project switched to an environment where it was no longer necessary to connect via proxy.

[spaasis]

I figured out a workaround for our situation at least.
The WebClient Proxy needs to be manually set:
ClientServiceWebClient:

        public ClientCertificateWebClient(IEnumerable<X509Certificate2> certificates) {
            Proxy = new WebProxy("your.proxy", 25);
...

MetadataLoader:

        private static MetadataBase Load(
            string metadataLocation,
...
            using (WebClient client = new WebClient() { Proxy = new WebProxy("your.proxy", 25) })
...

For some reason the environment default proxy did not get set automatically, though apparently it should, so we have to manually set it.

This worked for our case, YMMV.