[英]Can gzip compression be selectively disabled in ASP.NET/IIS 7?
I am using a long-lived asynchronous HTTP connection to send progress updates to a client via AJAX. 我使用长期的异步HTTP连接通过AJAX向客户端发送进度更新。 When compression is enabled, the updates are not received in discrete chunks (for obvious reasons).
启用压缩时,不会以离散块的形式接收更新(出于显而易见的原因)。 Disabling compression (by adding a
<urlCompression>
element to <system.webServier>
) does solve the problem: 禁用压缩(通过向
<system.webServier>
添加<urlCompression>
元素) 确实解决了问题:
<urlCompression doStaticCompression="true" doDynamicCompression="false" />
However, this disables compression site-wide. 但是,这会在站点范围内禁用压缩。 I would like to preserve compression for every other controller and/or action except for this one.
我想保留每个其他控制器和/或操作的压缩,除了这个。 Is this possible?
这可能吗? Or am I going to have to create a new site/area with its own web.config?
或者我将不得不用自己的web.config创建一个新的站点/区域? Any suggestions welcome.
欢迎任何建议。
PS the code that does the writing to the HTTP response is: PS写入HTTP响应的代码是:
var response = HttpContext.Response;
response.Write(s);
response.Flush();
@Aristos' answer will work for WebForms, but with his help, I've adapted a solution more inline with ASP.NET/MVC methodology. @Aristos的回答将适用于WebForms,但在他的帮助下,我已经采用了更符合ASP.NET / MVC方法的解决方案。
Create a new filter to provide the gzipping functionality: 创建一个新的过滤器以提供gzipping功能:
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: 创建
NoGzip
属性:
public class NoGzipAttribute : Attribute {
}
Prevent IIS7 from gzipping using web.config: 使用web.config阻止IIS7进行gzipping攻击:
<system.webServer>
...
<urlCompression doStaticCompression="true" doDynamicCompression="false" />
</system.webServer>
Register your global filter in Global.asax.cs: 在Global.asax.cs中注册全局过滤器:
protected void Application_Start()
{
...
GlobalFilters.Filters.Add(new GzipFilter());
}
Finally, consume the NoGzip
attribute: 最后,使用
NoGzip
属性:
public class MyController : AsyncController
{
[NoGzip]
[NoAsyncTimeout]
public void GetProgress(int id)
{
AsyncManager.OutstandingOperations.Increment();
...
}
public ActionResult GetProgressCompleted()
{
...
}
}
PS Once again, many thanks to @Aristos, for his helpful idea and solution. PS再次感谢@Aristos,感谢他的有用的想法和解决方案。
I found a much easier way to do this. 我发现了一种更简单的方法。 Instead of selectively doing your own compression, you can selectively disable the default IIS compression (assuming its enabled in your web.config).
您可以选择性地禁用默认的IIS压缩(假设它在您的web.config中启用),而不是有选择地进行自己的压缩。
Simply remove the accept-encoding encoding header on the request and IIS wont compress the page. 只需删除请求中的accept-encoding编码标头,IIS就不会压缩页面。
(global.asax.cs:) (:)的global.asax.cs
protected void Application_BeginRequest(object sender, EventArgs e)
{
try
{
HttpContext.Current.Request.Headers["Accept-Encoding"] = "";
}
catch(Exception){}
}
What about you set the gzip compression by your self, selectivle when you wish for ? 你希望什么时候你自己设置gzip压缩,selectivle? On the Application_BeginRequest check when you like to make and when you dont make compression.
在Application_BeginRequest上检查您何时制作以及何时不进行压缩。 Here is a sample code.
这是一个示例代码。
protected void Application_BeginRequest(Object sender, EventArgs e)
{
string cTheFile = HttpContext.Current.Request.Path;
string sExtentionOfThisFile = System.IO.Path.GetExtension(cTheFile);
if (sExtentionOfThisFile.Equals(".aspx", StringComparison.InvariantCultureIgnoreCase))
{
string acceptEncoding = MyCurrentContent.Request.Headers["Accept-Encoding"].ToLower();;
if (acceptEncoding.Contains("deflate") || acceptEncoding == "*")
{
// defalte
HttpContext.Current.Response.Filter = new DeflateStream(prevUncompressedStream,
CompressionMode.Compress);
HttpContext.Current.Response.AppendHeader("Content-Encoding", "deflate");
} else if (acceptEncoding.Contains("gzip"))
{
// gzip
HttpContext.Current.Response.Filter = new GZipStream(prevUncompressedStream,
CompressionMode.Compress);
HttpContext.Current.Response.AppendHeader("Content-Encoding", "gzip");
}
}
}
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