[HttpGet]
public void MyResource()
{
    // Controller logic
}

public void GetControllerMethodHttpAttribute()
{
    MethodInfo controllerMethod = typeof(TestController).GetMethods().First();

    // Solution 1
    var attrs = controllerMethod.Attributes;

    // Solution 2
    var httpAttr = Attribute.GetCustomAttributes(typeof(HttpGetAttribute));

    // Solution 3
    var httpAttr2 = Attribute.GetCustomAttribute(controllerMethod, typeof(HttpGetAttribute));

    // Solution 4
    var httpAttr3 = Attribute.IsDefined(controllerMethod, typeof(HttpGetAttribute));
}