Question

如何为上传到.NET WebService（SOAP，而不是WCF）的POSTed数据启用压缩？我认为在IIS中enabling dynamic compression只是一个简单的问题，但启用后，它只压缩响应，而不是POST 请求。

我已将其添加为服务参考，但我无法在生成的SOAPClient上找到任何设置来启用压缩请求。

在将请求发送到服务器之前，似乎我可能缺少客户端的配置设置或代码来压缩请求？或者我正在尝试做什么（GZipping POST数据）甚至不支持？

更多信息：我在客户端和服务器上使用.NET 4.0。

Answer 1

我4年前发表过博客

http://netpl.blogspot.com/2009/07/aspnet-webservices-two-way-response-and.html

我想知道为什么你没有通过谷歌搜索找到这个。无论如何，这应该对你有用，我们现在在生产环境中工作了4年。

Answer 2

最后，我使用了Wiktor Zychla的回答，但遇到了一些错误（在他的文章的评论中也提到过）。为了完整起见，我将在此处发布我的固定版本的HttpCompression模块，但您需要的其余代码（和实施指南）位于Wiktor's article。

更新：

我实际上不得不停止使用此代码，因为它有一个我无法修复的错误（即使我的改进版本如下）。对于代理服务器背后的许多人，它会出现一个错误，上面写着“gzip标头中的幻数不正确”，我无法弄清楚如何解决这个问题。我认为这是因为代理服务器解压缩GZIP，并且此代码不允许以当前形式接收压缩和非压缩响应。

using System;
using System.IO.Compression;
using System.Web;
using System.Web.Security;

/// <summary>
/// Implement two way HTTP compression for the SOAP API
/// Code taken from: http://netpl.blogspot.co.uk/2009/07/aspnet-webservices-two-way-    response-and.html
/// Fix: Set Content-encoding: gzip header when an Exception occurs on the server.
/// Fix: Do not attempt to decrypt GZIP request stream when request was not GZIPed.
/// </summary>
public class HttpCompressionModule : IHttpModule
{
    private bool isDisposed = false;

    ~HttpCompressionModule()
    {
            Dispose(false);
    }

    public void Init(HttpApplication context)
    {
            context.BeginRequest += new EventHandler(Context_BeginRequest);
            context.PreSendRequestHeaders += new EventHandler(context_PreSendRequestHeaders);
    }

    void context_PreSendRequestHeaders(object sender, EventArgs e)
    {
            // Fix headers having been lost if an exception occurred.
            HttpApplication app = sender as HttpApplication;
            HttpContext ctx = app.Context;
            if (app.Response.Filter is GZipStream) SetEncoding("gzip");
            else if (app.Response.Filter is DeflateStream) SetEncoding("deflate");

            // Fix double header
            if (ctx.Response.Headers["Content-encoding"] == "gzip,gzip")
                    ctx.Response.Headers.Set("Content-encoding", "gzip");
    }

    public void Context_BeginRequest(object sender, EventArgs e)
    {
            HttpApplication app = sender as HttpApplication;
            HttpContext ctx = app.Context;

            // Currently only enable for the Uploader API webservice
            if (!ctx.Request.Url.PathAndQuery.ToLower().Contains("uploaderapi.asmx"))
            {
                    return;
            }

            // Add request filter if request was GZIP encoded
            string requestEncoding = ctx.Request.Headers["Content-encoding"];
            if (requestEncoding != null && requestEncoding == "gzip")
            {
               app.Request.Filter =
                    new System.IO.Compression.GZipStream(app.Request.Filter, CompressionMode.Decompress);
            }

            // Add response compression filter if the client accepts compressed responses
            if (IsEncodingAccepted("gzip"))
            {
                    app.Response.Filter = new GZipStream(app.Response.Filter, CompressionMode.Compress);
                    SetEncoding("gzip");
            }
            else if (IsEncodingAccepted("deflate"))
            {
                    app.Response.Filter = new DeflateStream(app.Response.Filter, CompressionMode.Compress);
                    SetEncoding("deflate");
            }
    }

    private bool IsEncodingAccepted(string encoding)
    {
            return HttpContext.Current.Request.Headers["Accept-encoding"] != null &&
                    HttpContext.Current.Request.Headers["Accept-encoding"].Contains(encoding);
    }

    private void SetEncoding(string encoding)
    {
            HttpContext ctx = HttpContext.Current;
            string responseEncodings = ctx.Response.Headers.Get("Content-encoding");
            if (responseEncodings == null || !responseEncodings.Contains(encoding))
                    HttpContext.Current.Response.AppendHeader("Content-encoding", encoding);
    }

    public void Dispose()
    {
            Dispose(true);
    }

    private void Dispose(bool dispose)
    {
            isDisposed = dispose;
    }
}

如何为IIS 7上的SOAP Web服务的POST（上载）请求启用GZIP压缩？

2 个答案: