How to get a response from the Nancy Negotiator?

Question

I have a NancyContext and I need to get a Response with a body based on the correct content negotiator for the request. I think I can use Nancy\'s

Answer 1

Based on your code sample, here's one possible way:

public Response ConvertToHttpResponse(Exception exception, NancyContext context, IEnumerable processors, Nancy.Conventions.AcceptHeaderCoercionConventions coercionConventions)
{
    var negotiator = new Negotiator(context)
        .WithStatusCode(HttpStatusCode.BadRequest)
        .WithReasonPhrase(exception.Message);

    return new DefaultResponseNegotiator(processors, coercionConventions)
        .NegotiateResponse(negotiator, context);
}

Depending on your implementation, a better way may be to have processors and coercionConventions as parameters to the class constructor, and allow the IoC container to resolve them as normal. However, in my case, I resolved them in my bootstrapper, and gave them to an extension method I created for negotiating Exception instances to an XML or JSON response.

protected override void ApplicationStartup(TinyIoCContainer container, IPipelines pipelines)
{
    //  Resolving outside the lambda because no more components will be registered at this point.
    var responseProcessors = container.Resolve>();
    var coercionConventions = container.Resolve();

    pipelines.OnError += (context, exception) => 
    {
        return exception.GetErrorResponse(context, responseProcessors, coercionConventions);
    };
}