来自asp app的流式mime类型'application/pdf'在Google Chrome中失败

Question

我有一个Web应用程序,可以在点击事件中流式传输PDF文件,它可以在IE,Firefox和Safari中正常工作,但在Chrome中它永远不会下载.下载只是读取"中断".Chrome处理流媒体有何不同？我的代码看起来像:

        this.Page.Response.Buffer = true;
        this.Page.Response.ClearHeaders();
        this.Page.Response.ClearContent();
        this.Page.Response.ContentType = "application/pdf";
        this.Page.Response.AppendHeader("Content-Disposition", "attachment;filename=" + fileName);
        Stream input = reportStream;
        Stream output = this.Page.Response.OutputStream;
        const int Size = 4096;
        byte[] bytes = new byte[4096];
        int numBytes = input.Read(bytes, 0, Size);
        while (numBytes > 0)
        {
            output.Write(bytes, 0, numBytes);
            numBytes = input.Read(bytes, 0, Size);
        }

        reportStream.Close();
        reportStream.Dispose();
        this.Page.Response.Flush();
        this.Page.Response.Close();

关于我可能缺少什么的任何建议？

Answer 1

最近的Google Chrome v12版本引入了一个错误,可以触发您描述的问题.

您可以通过发送Content-Length标头来修复它,如下面的代码修改版本所示:

this.Page.Response.Buffer = true;
this.Page.Response.ClearHeaders();
this.Page.Response.ClearContent();
this.Page.Response.ContentType = "application/pdf";
this.Page.Response.AppendHeader("Content-Disposition", "attachment;filename=" + fileName);
Stream input = reportStream;
Stream output = this.Page.Response.OutputStream;
const int Size = 4096;
byte[] bytes = new byte[4096];
int totalBytes = 0;
int numBytes = input.Read(bytes, 0, Size);
totalBytes += numBytes;
while (numBytes > 0)
{
    output.Write(bytes, 0, numBytes);
    numBytes = input.Read(bytes, 0, Size);
    totalBytes += numBytes;
}

// You can set this header here thanks to the Response.Buffer = true above
// This header fixes the Google Chrome bug
this.Page.Response.AddHeader("Content-Length", totalBytes.ToString());

reportStream.Close();
reportStream.Dispose();
this.Page.Response.Flush();
this.Page.Response.Close();