OAuth2 HttpClient Handler, by Fastchannel

Managed .NET library to be used within HttpClient instances, enabling them to transparantly call authorized remote APIs protected with OAuth2 or OpenID-Connect standards.

Supports .NET Framework 4.5+ and .NET Standard / .NET Core.

Get it on NuGet

PM> Install-Package Fastchannel.HttpClient.OAuth2Handler

Basic Usage

var options = new OAuthHttpHandlerOptions
{
    AuthorizerOptions = new AuthorizerOptions
    {
        TokenEndpointUrl = new Uri("https://localhost/token"),
        GrantType = GrantType.ClientCredentials,
        ClientId = "SomeClientId",
        ClientSecret = "SomeClientSecret"
    }
};

using (var client = new HttpClient(new OAuthHttpHandler(options)))
{
    client.BaseAddress = new Uri("http://localhost");
    var response = await client.GetAsync("/api/protected_api_call");
    // ...
}