The constructor is invoked too early, you can't access the parameters from there. However, you can override the Initialize method and retrieve the GET parameters from the context:

protected override void Initialize(HttpControllerContext controllerContext)

{

    foreach (var parameter in controllerContext.Request.GetQueryNameValuePairs())

    {

        Debug.WriteLine(string.Format("{0} = {1}", parameter.Key, parameter.Value));

    }

    base.Initialize(controllerContext);

}

 string requestBody = await controllerContext.Request.Content.ReadAsStringAsync();

 builder.Register((c,p) => GetProgramContract(c,p.Named<MessageHeader>("Header"))).As<IProgramContract>().InstancePerLifetimeScope();

            builder.Register((c,p) => new DynamicProfileService(GetProgramContract(c,p.Named<MessageHeader>("Header")))).As<IDynamicProfileService>().InstancePerLifetimeScope();

 private static ProgramContract GetProgramContract(IComponentContext c, MessageHeader header)

        {

            var reportContract = c.Resolve<IReportContract>();

            var adminWebContract = c.Resolve<IAdminWebContract>();

            var serviceFactory = c.Resolve<IContractFactory>();

            var connectionString = adminWebContract.AdminWebGetRepositoryConnectionString();

            RepositoryComponent repositoryComponent = new RepositoryComponent(reportContract);

            var program = repositoryComponent.GetProgramIdAndCultureCodeByCountryCode(connectionString,header.OpCo);

            var programContract =

                new ProgramContract(serviceFactory, program.Id, program.CultureCode, program.CountryCode);

            return programContract;

        }

public class ServiceInitializeAttribute : ActionFilterAttribute

    {

        public override void OnActionExecuting(HttpActionContext actionContext)

        {

            dynamic obj = actionContext.ActionArguments["request"];

            var controllerContext = actionContext.ControllerContext;

            var controller = controllerContext.Controller as BaseApiController;

            var dependencyScope = controllerContext.Request.GetDependencyScope();

            var lifetimeScope = dependencyScope.GetRequestLifetimeScope();

            if (controller == null)

            {

                throw new NotSupportedException($"Type {controllerContext.Controller.GetType()} is not supported.");

            }

            var parameter = new NamedParameter("Header", obj.Header);

            controller.Program = lifetimeScope.Resolve<IProgramContract>(parameter);

            controller.Service = lifetimeScope.Resolve<IDynamicProfileService>(parameter);

        }

    }