There is no way to forecast the execution order of WebApi Action Filters. It changes randomly each time the code is changed. It would be nice to have an integer property to control the order like in normal Mvc controllers, but also respecting the order they are put on the action method would be acceptable

Integerated OAuth Authentication for Asp.net WebApi including OAuth Service Provider.

Currently the XML serialisers both output namespaces that are not required:

xmlns:xsd="http://www.w3.org/2001/XMLSchema"; xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";

I'm not sure about the Data Contract serializer, but it is not difficult to supress these...

Just pass into the Serialize method an XmlSerializerNamespaces:

var xmlSerializerNamespaces = new XmlSerializerNamespaces();
xmlSerializerNamespaces.Add(String.Empty, defaultNamespace);

var xmlSerializer = new XmlSerializer(objectType);
xmlSerializer.Serialize(xmlWriter, toBeSerialised, xmlSerializerNamespaces);

Where defaultNamespace could be set on the GlobalConfiguration.Configuration.Formatters.XmlFormatter or it could be read from the XmlRoot attribute (if present) on the object being serialised.

The section on learning Web API needs to have a topic around writing unit tests. Web API home pages says it's 'easy to test' but then there are no topics around it. Please add a topic on unit testing

Right now Web API is viewed as a component under AP.NET MVC. But, in my opinion, it should be available as just a common file template. The file template is available now, but still developers categorize Web API under ASP.NET MVC. Please evangelize Web API such that it will be viewed as a component under ASP.NET core.

It is just my opinion. You may correct me if I am wrong.