可以gzip压缩COM pression在ASP.NET/IIS 7有选择地禁止？ [英] Can gzip compression be selectively disabled in ASP.NET/IIS 7?

问题描述

我使用的是长寿命的异步HTTP连接通过AJAX进度更新发送到客户端。当启用COM pression，更新不会离散块收到（原因很明显）。禁用COM pression（通过添加＆LT; urlCom pression＆GT; 元素＆LT; system.webServier＆GT; ）的确实的解决这个问题：

 ＆LT; urlCom pression doStaticCom pression =真doDynamicCom pression =FALSE/＆GT;
 

不过，这种禁用COM pression站点范围。我想preserve COM pression的除了这个其他所有控制器和/或采取行动。这可能吗？还是我将不得不创建具有自身Web.config的网站/地区？任何建议表示欢迎。

P.S。在code，做了书面的HTTP响应是：

  VAR响应= HttpContext.Response;
RESPONSE.WRITE（S）;
response.Flush（）;
 

解决方案

@Aristos的回答将为WebForms的工作，但在他的帮助，我已经适应与ASP.NET/MVC方法的解决方案更直列。

创建新的过滤器，以提供gzip压缩功能：

 公共类GzipFilter：ActionFilterAttribute
{
    公共覆盖无效OnActionExecuted（ActionExecutedContext filterContext）
    {
        base.OnActionExecuted（filterContext）;        VAR语境= filterContext.HttpContext;
        如果（filterContext.Exception == NULL和放大器;＆安培;
            context.Response.Filter = NULL＆放大器;！＆安培;
            ！filterContext.ActionDescriptor.IsDefined（typeof运算（NoGzipAttribute），真））
        {
            字符串acceptEncoding = context.Request.Headers [的Accept-Encoding]。ToLower将（）;;            如果（acceptEncoding.Contains（gzip的））
            {
                context.Response.Filter =新GZipStream（context.Response.Filter，COM pressionMode.Com preSS）;
                context.Response.AppendHeader（内容编码，gzip的）;
            }
            否则，如果（acceptEncoding.Contains（放气））
            {
                context.Response.Filter =新DeflateStream（context.Response.Filter，COM pressionMode.Com preSS）;
                context.Response.AppendHeader（内容编码，放气）;
            }
        }
    }
}
 

在 NoGzip 属性：

 公共类NoGzipAttribute：属性{
}
 

prevent IIS7使用gzip压缩的web.config：

 ＆LT; system.webServer＆GT;
    ...
    ＆LT; urlCom pression doStaticCom pression =真doDynamicCom pression =FALSE/＆GT;
＆LT; /system.webServer>
 

填写您的全局过滤器在Global.asax.cs中：

 保护无效的Application_Start（）
{
    ...
    GlobalFilters.Filters.Add（新GzipFilter（））;
}
 

最后，消耗 NoGzip 属性：

 公共类myController的：AsyncController
{
    [NoGzip]
    [NoAsyncTimeout]
    公共无效GetProgress（INT ID）
    {
        AsyncManager.OutstandingOperations.Increment（）;
        ...
    }    公众的ActionResult GetProgressCompleted（）
    {
        ...
    }
}
 

P.S。再次，非常感谢@Aristos，他有益的观点和解决方案。

I am using a long-lived asynchronous HTTP connection to send progress updates to a client via AJAX. When compression is enabled, the updates are not received in discrete chunks (for obvious reasons). Disabling compression (by adding a <urlCompression> element to <system.webServier>) does solve the problem:

<urlCompression doStaticCompression="true" doDynamicCompression="false" />

However, this disables compression site-wide. I would like to preserve compression for every other controller and/or action except for this one. Is this possible? Or am I going to have to create a new site/area with its own web.config? Any suggestions welcome.

P.S. the code that does the writing to the HTTP response is:

var response = HttpContext.Response;
response.Write(s);
response.Flush();

解决方案

@Aristos' answer will work for WebForms, but with his help, I've adapted a solution more inline with ASP.NET/MVC methodology.

Create a new filter to provide the gzipping functionality:

public class GzipFilter : ActionFilterAttribute
{
    public override void OnActionExecuted(ActionExecutedContext filterContext)
    {
        base.OnActionExecuted(filterContext);

        var context = filterContext.HttpContext;
        if (filterContext.Exception == null && 
            context.Response.Filter != null &&
            !filterContext.ActionDescriptor.IsDefined(typeof(NoGzipAttribute), true))
        {
            string acceptEncoding = context.Request.Headers["Accept-Encoding"].ToLower();;

            if (acceptEncoding.Contains("gzip"))
            {
                context.Response.Filter = new GZipStream(context.Response.Filter, CompressionMode.Compress);
                context.Response.AppendHeader("Content-Encoding", "gzip");
            }                       
            else if (acceptEncoding.Contains("deflate"))
            {
                context.Response.Filter = new DeflateStream(context.Response.Filter, CompressionMode.Compress);
                context.Response.AppendHeader("Content-Encoding", "deflate");
            } 
        }
    }
}

Create the NoGzip attribute:

public class NoGzipAttribute : Attribute {
}

Prevent IIS7 from gzipping using web.config:

<system.webServer>
    ...
    <urlCompression doStaticCompression="true" doDynamicCompression="false" />
</system.webServer>

Register your global filter in Global.asax.cs:

protected void Application_Start()
{
    ...
    GlobalFilters.Filters.Add(new GzipFilter());
}

Finally, consume the NoGzip attribute:

public class MyController : AsyncController
{
    [NoGzip]
    [NoAsyncTimeout]
    public void GetProgress(int id)
    {
        AsyncManager.OutstandingOperations.Increment();
        ...
    }

    public ActionResult GetProgressCompleted() 
    {
        ...
    }
}

P.S. Once again, many thanks to @Aristos, for his helpful idea and solution.

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