C# 激活压缩后.css文件中的奇怪效果

昨天我在我的网站上激活了压缩，如下所示：

void context_BeginRequest(object sender, EventArgs e)
{

    HttpApplication app = (HttpApplication)sender;
    string encodings = app.Request.Headers.Get("Accept-Encoding");

    if (encodings == null)
        return;

    string url = app.Request.RawUrl.ToLower();           


    if (url.Contains(".js") || url.Contains(".aspx") || url.Contains(".css") || url.Contains("ajax.ashx"))
    {

        Stream baseStream = app.Response.Filter;
        encodings = encodings.ToLower();

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

if (url.Contains(".js") || url.Contains(".aspx") || url.Contains(".css") || url.Contains("ajax.ashx"))
{
    app.Response.AppendHeader("Vary", "Accept-Encoding");

    encodings = encodings.ToLower();

    if (encodings.Contains("gzip") || encodings == "*")
    {
        app.Response.Filter = new GZipStream(baseStream, CompressionMode.Compress);
        app.Response.AppendHeader("Content-Encoding", "gzip");

    }
    else if (encodings.Contains("deflate"))
    {
        app.Response.Filter = new DeflateStream(baseStream, CompressionMode.Compress);
        app.Response.AppendHeader("Content-Encoding", "deflate");
    }
}

昨晚，人们抱怨网站的风格被破坏了。我在Firefox和Chrome中尝试了这个网站，但也遇到了同样的问题，直到我强制刷新，清除了缓存

今天早上，我打开Safari，查看它在浏览器中的外观，并检查存储的样式表。下面是顶行的一部分：

���`I�%&/m�{J�J��t��`$ؐ@�������iG#)�*��eVe]f@�흼��{����{����;�N'���?\fdl��J�ɞ!���?~|?"�~+M�m�?��{�7y����l]�餮���N���̛�x�Ϋ�Q�cMVg��

我认为要么Safari试图解压一开始没有被压缩的东西，要么它收到了一个压缩文件而没有解码

这是一个一次性问题，当访问我的网站的访问者清除他们的缓存时就会被清除，还是我在编写HttpCompression函数时出错了？

请尝试以下方法：

   HttpApplication app = sender as HttpApplication;
        string acceptEncoding = app.Request.Headers["Accept-Encoding"];
        Stream prevUncompressedStream = app.Response.Filter;

        if (!(app.Context.CurrentHandler is Page ||
            app.Context.CurrentHandler.GetType().Name == "SyncSessionlessHandler") ||
            app.Request["HTTP_X_MICROSOFTAJAX"] != null)
            return;

        if (string.IsNullOrEmpty(acceptEncoding))
            return;

        acceptEncoding = acceptEncoding.ToLower();


        if (acceptEncoding.Contains("gzip") || acceptEncoding == "*")
        {
            // gzip
            app.Response.Filter = new GZipStream(prevUncompressedStream, CompressionMode.Compress);
            app.Response.AppendHeader("Content-Encoding", "gzip");
        }
        else if (acceptEncoding.Contains("deflate"))
        {
            // defalte
            app.Response.Filter = new DeflateStream(prevUncompressedStream, CompressionMode.Compress);
            app.Response.AppendHeader("Content-Encoding", "deflate");
        }

---

我相信我这里的问题与我的回答中没有添加

Vary:Accept Encoding

标题有关。请看。我的代码现在如下所示：

void context_BeginRequest(object sender, EventArgs e)
{

    HttpApplication app = (HttpApplication)sender;
    string encodings = app.Request.Headers.Get("Accept-Encoding");

    if (encodings == null)
        return;

    string url = app.Request.RawUrl.ToLower();           


    if (url.Contains(".js") || url.Contains(".aspx") || url.Contains(".css") || url.Contains("ajax.ashx"))
    {

        Stream baseStream = app.Response.Filter;
        encodings = encodings.ToLower();

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

if (url.Contains(".js") || url.Contains(".aspx") || url.Contains(".css") || url.Contains("ajax.ashx"))
{
    app.Response.AppendHeader("Vary", "Accept-Encoding");

    encodings = encodings.ToLower();

    if (encodings.Contains("gzip") || encodings == "*")
    {
        app.Response.Filter = new GZipStream(baseStream, CompressionMode.Compress);
        app.Response.AppendHeader("Content-Encoding", "gzip");

    }
    else if (encodings.Contains("deflate"))
    {
        app.Response.Filter = new DeflateStream(baseStream, CompressionMode.Compress);
        app.Response.AppendHeader("Content-Encoding", "deflate");
    }
}

---

你有什么理由不让我告诉你吗？@Mr.defessional在我之前开发这个网站的家伙就是这样做的（他只为对ajax.ashx的响应启用了压缩）。看起来还可以。谢谢你。如果（！app.Context.CurrentHandler是Page | |…语句，那么

会检查什么？我对压缩没有意义的东西（如图像）非常谨慎。例如，我从
userImage.ashx
文件提供一些动态PNG。