Handling

To add your own logic for executing requests, create your own implementation of the IClientHandler interface and pass implementation to the WithHandling method. For example you can implement authentication using handlers:

public class AuthHandler : IClientHandler
{
    private readonly IConfiguration _configuration;
    
    public AuthHandler(IConfiguration configuration) 
        => _configuration = configuration;

    public Task<HttpRequest> HandleRequestAsync(HttpRequest httpRequest, MethodInvocation methodInvocation)
    {
        httpRequest.AddHeader(name: "Authorization", value: _configuration["token"]);
        return Task.FromResult(httpRequest);
    }

    public Task<IHttpResponse> HandleResponseAsync(IHttpResponse httpResponse, MethodInvocation methodInvocation) 
        => Task.FromResult(httpResponse);
}
...

IConfiguration configuration = ...;
IMyClient client = NClientGallery.Clients.GetRest()
    .For<IMyClient>(host: "http://localhost:8080")
    .WithHandling(new IClientHandler[] { new AuthHandler(configuration) })
    .Build();

The client can apply handlers in a strictly specified order, for this use IOrderedClientHandler<TRequest, TResponse> interface.