Abp.core中在應用層獲取HttpContext對象

實際IHttpContextAccessor對象已經在底層實現了自動的依賴注入，只需要在應用層引入Microsoft.AspNetCore.Http，然后在構造函數中依賴注入即可。

/// <summary>
    /// 應用服務父類
    /// </summary>
    public abstract class AppServiceBase : ApplicationService
    {
        protected IHttpContextAccessor httpContext;

        /// <summary>
        /// 客戶端域名
        /// </summary>
        protected string origin;
 
        protected AppServiceBase (IHttpContextAccessor httpContextAccessor)
        {
            LocalizationSourceName = FakaConsts.LocalizationSourceName;
            httpContext = httpContextAccessor;
            origin = httpContextAccessor.HttpContext.Request.Headers["Origin"].ToString();
        }
   }