Question

有没有办法让Azure Web Sites为来自HTTP Amazon Web Services CloudFront等HTTP 1.0代理的请求提供gzip内容？考虑这样的请求：

curl -I -H "accept-encoding: gzip,deflate,sdch" -H "Via: 1.0 {foo.cdn.net}" -0 http://{fooproject}.azurewebsites.net/

似乎要完成的一般方法是将以下元素添加到system.webServer：

<httpCompression noCompressionForHttp10="false" noCompressionForProxies="false" />

ApplicationHost.config中httpCompression is only valid似乎Serving Compressed Files with CloudFront而非web.config，这意味着它在Azure网站上不可覆盖。

有关解决方法的任何建议吗？

其他资源：

Tweaking Windows Azure Web Sites
{{3}}

Answer 1

IIS不会压缩HTTP / 1.0请求。您可以通过设置：

来覆盖此行为

appcmd set config -section:system.webServer/httpCompression /noCompressionForHttp10:"False"

Answer 2

检查这两篇文章，如果您想将压缩（gzip）内容发送回客户端，它们可能会对您有所帮助：

http://christesene.com/mvc-3-action-filters-enable-page-compression-gzip/

http://www.west-wind.com/weblog/posts/2012/Apr/28/GZipDeflate-Compression-in-ASPNET-MVC

Answer 3

执行此工作的自动神奇HTTP模块如下所示。您需要在Web.config文件中注册它。

/// <summary>
/// Provides HTTP compression support for CDN services when
/// ASP.NET website is used as origin.
/// </summary>
public sealed class CdnHttpCompressionModule : IHttpModule
{
    public void Init(HttpApplication context)
    {
        context.PreRequestHandlerExecute += Context_PreRequestHandlerExecute;
    }

    public void Dispose()
    {
    }

    void Context_PreRequestHandlerExecute(object sender, EventArgs e)
    {
        var application = (HttpApplication)sender;
        var request = application.Request;
        var response = application.Response;

        // ---------------------------------------------------------------------

        bool allowed = false;

        string via = request.Headers["Via"];
        if (!string.IsNullOrEmpty(via))
        {
            if (via.Contains(".cloudfront.net"))
            {
                // Amazon CloudFront
                allowed = true;
            }

            // HINT: You can extend with other criterias for other CDN providers.
        }

        if (!allowed)
            return;

        // ---------------------------------------------------------------------

        try
        {
            if (request["HTTP_X_MICROSOFTAJAX"] != null)
                return;
        }
        catch (HttpRequestValidationException)
        {
        }

        // ---------------------------------------------------------------------

        string acceptEncoding = request.Headers["Accept-Encoding"];
        if (string.IsNullOrEmpty(acceptEncoding))
            return;

        string fileExtension = request.CurrentExecutionFilePathExtension;
        if (fileExtension == null)
            fileExtension = string.Empty;
        fileExtension = fileExtension.ToLowerInvariant();

        switch (fileExtension)
        {
            case "":
            case ".js":
            case ".htm":
            case ".html":
            case ".css":
            case ".txt":
            case ".ico":
                break;

            default:
                return;
        }

        acceptEncoding = acceptEncoding.ToLowerInvariant();
        string newContentEncoding = null;

        if (acceptEncoding.Contains("gzip"))
        {
            // gzip
            response.Filter = new GZipStream(response.Filter, CompressionMode.Compress);
            newContentEncoding = "gzip";
        }
        else if (acceptEncoding.Contains("deflate"))
        {
            // deflate
            response.Filter = new DeflateStream(response.Filter, CompressionMode.Compress);
            newContentEncoding = "deflate";
        }

        if (newContentEncoding != null)
        {
            response.AppendHeader("Content-Encoding", newContentEncoding);
            response.Cache.VaryByHeaders["Accept-Encoding"] = true;
        }
    }
}

该模块设计用于在集成管道模式下使用IIS 7.0或更高版本（Azure网站具有开箱即用的功能）。这是最普遍的配置，所以一般来说只要你附上它就可以了。请注意，该模块应该是模块列表中的第一个模块。

Web.config注册示例：

<configuration>
  <system.webServer>
    <modules runAllManagedModulesForAllRequests="true">
      <add name="CdnHttpCompressionModule" preCondition="managedHandler" type="YourWebsite.Modules.CdnHttpCompressionModule, YourWebsite" />
      <!-- You may have other modules here -->
    </modules>  
  <system.webServer>
</configuration>

Azure网站上的HTTP 1.0代理请求的gzip压缩

3 个答案: