我正在尝试调试为什么我的页面没有根据 YSLOW 进行 GZIP 压缩或压缩的问题。我最终在服务器上启用了失败的请求日志,并且能够看到它不压缩的失败原因,它认为它已经被压缩了。
DYNAMIC_COMPRESSION_NOT_SUCCESS Reason="ALREADY_CONTENT_ENCODING"
我在 IIS 中启用了动态和静态压缩,还更改了 web.config 文件以包含以下内容。
<httpCompression directory="%SystemDrive%\inetpub\temp\IIS Temporary Compressed Files">
<scheme name="gzip" dll="%Windir%\system32\inetsrv\gzip.dll" staticCompressionLevel="9" />
<dynamicTypes>
<add mimeType="text/*" enabled="true" />
<add mimeType="message/*" enabled="true" />
<add mimeType="application/x-javascript" enabled="true" />
<add mimeType="application/json" enabled="true" />
<add mimeType="*/*" enabled="false" />
</dynamicTypes>
<staticTypes>
<add mimeType="text/*" enabled="true" />
<add mimeType="message/*" enabled="true" />
<add mimeType="application/x-javascript" enabled="true" />
<add mimeType="application/atom+xml" enabled="true" />
<add mimeType="application/xaml+xml" enabled="true" />
<add mimeType="*/*" enabled="false" />
</staticTypes>
</httpCompression>
<urlCompression doStaticCompression="true" doDynamicCompression="true"/>
此外,在我的 aspx 页面上,我有一个在每个页面(页面加载时)之前调用的方法来运行 gzip 压缩(这可能就是导致错误的原因)。
这就是我从页面加载中调用该方法的方法
//compress page
Compression.GZipEncodePage();
这就是压缩页面的方法
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
namespace InitialDataEntry
{
public static class Compression
{
/// <summary>
/// Sets up the current page or handler to use GZip through a Response.Filter
/// IMPORTANT:
/// You have to call this method before any output is generated!
/// </summary>
public static void GZipEncodePage()
{
HttpResponse Response = HttpContext.Current.Response;
if (IsGZipSupported())
{
string AcceptEncoding = HttpContext.Current.Request.Headers["Accept-Encoding"];
if (AcceptEncoding.Contains("deflate"))
{
Response.Filter = new System.IO.Compression.DeflateStream(Response.Filter,
System.IO.Compression.CompressionMode.Compress);
Response.AppendHeader("Content-Encoding", "deflate");
}
else
{
Response.Filter = new System.IO.Compression.GZipStream(Response.Filter,
System.IO.Compression.CompressionMode.Compress);
Response.AppendHeader("Content-Encoding", "gzip");
}
}
// Allow proxy servers to cache encoded and unencoded versions separately
Response.AppendHeader("Vary", "Content-Encoding");
}
/// <summary>
/// Determines if GZip is supported
/// </summary>
/// <returns></returns>
public static bool IsGZipSupported()
{
string AcceptEncoding = HttpContext.Current.Request.Headers["Accept-Encoding"];
string IsPartial = HttpContext.Current.Request.Headers["x-microsoftajax"];
if (!string.IsNullOrEmpty(AcceptEncoding) &&
AcceptEncoding.Contains("gzip") || AcceptEncoding.Contains("deflate"))
//Just checking to see if this is a partial page update
if (string.Compare("Delta=true", IsPartial, true) == 0)
{
return false;
}
else
{
return true;
}
else
{
return false;
}
}
}
}
顺便说一句,这曾经可以工作,但不确定它什么时候停止,但是我的用户意识到了这个问题,因为页面大小变得臃肿,以前的 500k 现在变成了 2mb!
任何帮助将不胜感激。
Thanks,