异常中断响应压缩

Question

我写了一个 IHttpModule 使用 gzip 压缩我的响应（我返回大量数据。）以减少响应大小。只要 Web 服务不引发异常，它就可以很好地工作。如果抛出异常，则会对异常进行 gzip 压缩，但 Content-encoding 标头会消失，客户端不知道读取异常。

为什么缺少标题？我需要在客户端获取异常。

这是模块：

public class JsonCompressionModule : IHttpModule
{
    public JsonCompressionModule()
    {
    }

    public void Dispose()
    {
    }

    public void Init(HttpApplication app)
    {
        app.BeginRequest += new EventHandler(Compress);
    }

    private void Compress(object sender, EventArgs e)
    {
        HttpApplication app = (HttpApplication)sender;
        HttpRequest request = app.Request;
        HttpResponse response = app.Response;
        try
        {
            //Ajax Web Service request is always starts with application/json
            if (request.ContentType.ToLower(CultureInfo.InvariantCulture).StartsWith("application/json"))
            {
                //User may be using an older version of IE which does not support compression, so skip those
                if (!((request.Browser.IsBrowser("IE")) && (request.Browser.MajorVersion <= 6)))
                {
                    string acceptEncoding = request.Headers["Accept-Encoding"];

                    if (!string.IsNullOrEmpty(acceptEncoding))
                    {
                        acceptEncoding = acceptEncoding.ToLower(CultureInfo.InvariantCulture);

                        if (acceptEncoding.Contains("gzip"))
                        {
                            response.AddHeader("Content-encoding", "gzip");
                            response.Filter = new GZipStream(response.Filter, CompressionMode.Compress);
                        }
                        else if (acceptEncoding.Contains("deflate"))
                        {
                            response.AddHeader("Content-encoding", "deflate");
                            response.Filter = new DeflateStream(response.Filter, CompressionMode.Compress);
                        }
                    }
                }
            }
        }
        catch (Exception ex)
        {
            int i = 4;
        }
    }
}

这里是网络服务：

[WebMethod]
public void DoSomething()
{
    throw new Exception("This message get currupted on the client because the client doesn't know it gzipped.");
}

Answer 1

您应该尝试在page_error 或application_error 事件处理程序中处理异常。 我不知道标头会发生什么，但您可能可以通过在应用程序中除以零来模拟和调试 Compress 方法。

查看link 了解 ASP.NET 中的全局异常处理