Support custom HttpClient (for proxy auth) about certificate-transparency

[dmariogatto]

Would something like this suffice... GoogleLogListApi HttpClient Ctor? Note, that you will have to correctly set the base address of the HttpClient that you pass through.

Otherwise if you wanted to do something more complex, like support a different log list provider, you could create a custom implementation of ILogListApi.

[amather]

Hi! I just discovered that it is indeed possible to configure the auth from the outside, so that no changes to this project are required.

While the DefaultProxy itself is read-only, its .Credentials property can be set. This way, I can configure the DefaultProxy with credentials before the HttpClient instance within GoogleLogListApi is created.

My code now looks like this and works fine with this library:

    var systemProxy = HttpClient.DefaultProxy.GetProxy(new(GeorgeClient.BaseUrl)) ;
    if(systemProxy != null && _httpClientHandler.Proxy == null && _httpClientHandler.SupportsProxy)
    {
        HttpClient.DefaultProxy.Credentials = CredentialCache.DefaultNetworkCredentials;
    }
    _httpClient = new(_httpClientHandler);

Thanks for your efforts though!