问题：
我为我兄弟制作了一个主页，可以在这里访问：
http://www.daniel-steiger.ch
它在 Linux 上使用 Microsoft ASP.NET MVC3 和 mono 3，通过 fastcgi 和 nginx（加上我自己的 DNS 服务器）。
现在我知道这是一个不寻常的星座，但到目前为止，一切都很好。
然而，我遇到了一个非常微妙的小错误。
当在图库中单击缩略图时，我想通过图库控制器的 FullImage 方法在新选项卡中显示全尺寸图像。
例如，这个直接网址：
http://www.daniel-steiger.ch/gallery/FullImage/001.jpg
在 Internet Explorer 中，我将图像改为文本。
在所有其他浏览器中显示“无效图像”消息。
我通过直接文件 URL 调用图像解决了这个问题，效果很好：
http://www.daniel-steiger.ch/Content/images/gallery/001.jpg?LastWriteTimeUTC=1358694795000
随后，我向 mono 邮件列表报告了该错误
http://mono.1490590.n4.nabble.com/Bug-in-mono-3-0-1-MVC3-File-FileResult-td4658382.html
现在我得到的答复是，这都是我的错，因为我设置了错误的图像 MIME 类型，这是真的。
然而，我发现奇怪的是，如果是这样的话，相同的代码在 Windows 上运行得很好，而且像 Chrome 这样的智能浏览器通常会检测到错误的 MIME 设置并使用正确的设置。
因此，我将 mime-type 从“image/jpg”更改为“image/jpeg”，并将项目重新部署到服务器。
我还使用文件实用程序检查了该图像是否实际上是 jpeg 图像，确实如此。
奇怪的是，它仍然没有显示图像。
在 Internet Explorer 上，我现在得到“不可用”。
在所有其他浏览器上，我得到：图像无法显示，因为它包含错误。
我现在从图像包含错误的 URL 中 wget 图像。
wget http://www.daniel-steiger.ch/gallery/fullimage/001.jpg
然后我在无效文件和原始文件之间进行了二进制比较：
cmp -l 001.jpg 001a.jpg | awk '{printf "%08X %02X %02X\n", $1, strtonum(0$2), strtonum(0$3)}' >> comparison.txt
这是比较结果：
What springs into my eye, is that the image that internet explorer says he cannot find is actually 1.7 MB in size, and contains the extra bytes:
31 39 36 62 36 38 0D 0A
一开始...
任何人都知道这里出了什么问题/这些字节可能来自哪里（除了它很可能来自 mono/fastcgi 中的错误这一事实之外）？
顺便说一句，这是新的控制器代码：
namespace Homepage.Controllers
{
public class GalleryController : Controller
{
protected static string GetImageDirectory()
{
string bd = AppDomain.CurrentDomain.BaseDirectory;
string strImageDirectory = System.IO.Path.Combine(bd,
"Content");
strImageDirectory =
System.IO.Path.Combine(strImageDirectory, "images");
strImageDirectory =
System.IO.Path.Combine(strImageDirectory, "gallery");
return strImageDirectory;
} // End Function GetImageDirectory
protected static string strImageDirectory = GetImageDirectory();
public FileResult FullImage(string id)
{
string strFileName =
System.IO.Path.Combine(strImageDirectory, id);
//return new FilePathResult("CorrectFullPathAndFileName", "CorrectMime");
//return File(strFileName, "image/jpg"); // Old
return File(strFileName, "image/jpeg"); // New
} // End Action FullImage
public FileResult Thumb(string id)
{
//return Redirect(id);
string strFileName =
System.IO.Path.Combine(strImageDirectory, id);
System.IO.Stream ms =
Tools.Imaging.GetThumbnailStream(strFileName,
System.Drawing.Imaging.ImageFormat.Png);
return File(ms, "image/png");
/*
using (System.IO.Stream ms =
Tools.Imaging.GetThumbnailStream(strFileName,
System.Drawing.Imaging.ImageFormat.Png))
{
return File(ms, "image/png");
}*/
} // End Action Thumb
} // End Class GalleryController : Controller
} // End Namespace Homepage.Controllers
Edit:
它变得陌生：
还有一个额外的序列
0d 0a 0d 0a 30 0d 0a 0d 0a
在最后...
我刚刚做了十六进制转储，发现原始文件的文件大小（屏住呼吸）：
00196b68
这里是十六进制转储（每个 8 MB）：
规范格式（hexdump -C 001.jpg > 001.txt）：
原始文件：http://www.daniel-steiger.ch/001.txt
损坏的文件：http://www.daniel-steiger.ch/001a.txt
纯转储（hexdump 001.jpg > 001_1.txt）：
原始文件：http://www.daniel-steiger.ch/001_1.txt
损坏的文件：http://www.daniel-steiger.ch/001a_1.txt
嗯，损坏文件的十六进制转储为 5 MB，原始文件的十六进制转储为 8.2 MB...
我使用最新的稳定版 nginx：
sudo -s
nginx=stable # use nginx=development for latest development version
add-apt-repository ppa:nginx/$nginx
apt-get update
apt-get install nginx
Tools.Imaging 的完整代码（同时将 Tools 重命名为 MvcTools，以匹配程序集命名空间）
using System;
using System.Text;
namespace MvcTools
{
public class Imaging
{
//public static System.Drawing.Size m_sMaxThumbNailDimensions = new System.Drawing.Size(200, 200);
public static System.Drawing.Size m_sMaxThumbNailDimensions = new System.Drawing.Size(300, 300);
public static System.IO.Stream GetImageAsStream(
string strOrgFileName
, System.Drawing.Imaging.ImageFormat ifOutputFormat
)
{
return GetImageAsStream(strOrgFileName, ifOutputFormat, 1024);
} // End Function GetImage
public static System.IO.Stream GetImageAsStream(
string strOrgFileName
,System.Drawing.Imaging.ImageFormat ifOutputFormat
,int rez
)
{
System.IO.MemoryStream ms = null;
if (!System.IO.File.Exists(strOrgFileName))
throw new System.IO.FileNotFoundException(strOrgFileName);
try
{
using (System.Drawing.Image imgSourceImage = System.Drawing.Image.FromFile(strOrgFileName))
{
ms = new System.IO.MemoryStream();
imgSourceImage.Save(ms, ifOutputFormat);
ms.Position = 0;
} // End Using imgSourceImage
} // End Try
catch (Exception ex)
{
System.Windows.Forms.MessageBox.Show(ex.GetType().ToString());
System.Windows.Forms.MessageBox.Show(ex.Message);
//Response.Write(ex.Message);
} // End Catch
return ms;
} // End Function GetImageAsStream
public static System.Drawing.Size GetThumbnailSize(string strOrgFileName)
{
System.Drawing.Size sThumbNailSizeToUse = new System.Drawing.Size();
try
{
using (System.Drawing.Image imgSourceImage = System.Drawing.Image.FromFile(strOrgFileName))
{
decimal decPixToSubstract = 0;
decimal decPercentage;
if (m_sMaxThumbNailDimensions.Width < imgSourceImage.Size.Width || m_sMaxThumbNailDimensions.Height < imgSourceImage.Size.Height)
{
if (imgSourceImage.Size.Width > imgSourceImage.Size.Height)
{
decPercentage = (((decimal)imgSourceImage.Size.Width - (decimal)m_sMaxThumbNailDimensions.Width) / (decimal)imgSourceImage.Size.Width);
decPixToSubstract = decPercentage * imgSourceImage.Size.Height;
sThumbNailSizeToUse.Width = m_sMaxThumbNailDimensions.Width;
sThumbNailSizeToUse.Height = imgSourceImage.Size.Height - (int)decPixToSubstract;
} // End if (imgSourceImage.Size.Width > imgSourceImage.Size.Height)
else
{
decPercentage = (((decimal)imgSourceImage.Size.Height - (decimal)m_sMaxThumbNailDimensions.Height) / (decimal)imgSourceImage.Size.Height);
decPixToSubstract = decPercentage * (decimal)imgSourceImage.Size.Width;
sThumbNailSizeToUse.Height = m_sMaxThumbNailDimensions.Height;
sThumbNailSizeToUse.Width = imgSourceImage.Size.Width - (int)decPixToSubstract;
} // End else of if (imgSourceImage.Size.Width > imgSourceImage.Size.Height)
} // End if (m_sMaxThumbNailDimensions.Width < imgSourceImage.Size.Width || m_sMaxThumbNailDimensions.Height < imgSourceImage.Size.Height)
else
{
sThumbNailSizeToUse.Width = imgSourceImage.Size.Width;
sThumbNailSizeToUse.Height = imgSourceImage.Size.Height;
} // End else of if (m_sMaxThumbNailDimensions.Width < imgSourceImage.Size.Width || m_sMaxThumbNailDimensions.Height < imgSourceImage.Size.Height)
} // End Using imgSourceImage
} // End Try
catch (Exception ex)
{
System.Windows.Forms.MessageBox.Show(ex.Message);
//Response.Write(ex.Message);
} // End Catch
return sThumbNailSizeToUse;
} // End Sub GetThumbnailSize(string strOrgFileName)
// http://stackoverflow.com/questions/7319842/mvc3-razor-thumbnail-resize-image-ideas
// http://stackoverflow.com/questions/1528525/alternatives-to-system-drawing-for-use-with-asp-net/1528908#1528908
public static void GenerateThumbnailFile(
string strPhysicalPath,
string strOrgFileName, string strThumbnailFileName,
System.Drawing.Imaging.ImageFormat ifOutputFormat, int rez
)
{
try
{
using (System.Drawing.Image imgSourceImage = System.Drawing.Image.FromFile(strOrgFileName))
{
//System.Drawing.Image oImg = System.Drawing.Image.FromStream(fil.InputStream);
decimal decPixToSubstract = 0;
decimal decPercentage;
//default
System.Drawing.Size sThumbNailSizeToUse = new System.Drawing.Size();
if (m_sMaxThumbNailDimensions.Width < imgSourceImage.Size.Width || m_sMaxThumbNailDimensions.Height < imgSourceImage.Size.Height)
{
if (imgSourceImage.Size.Width > imgSourceImage.Size.Height)
{
decPercentage = (((decimal)imgSourceImage.Size.Width - (decimal)m_sMaxThumbNailDimensions.Width) / (decimal)imgSourceImage.Size.Width);
decPixToSubstract = decPercentage * imgSourceImage.Size.Height;
sThumbNailSizeToUse.Width = m_sMaxThumbNailDimensions.Width;
sThumbNailSizeToUse.Height = imgSourceImage.Size.Height - (int)decPixToSubstract;
} // End if (imgSourceImage.Size.Width > imgSourceImage.Size.Height)
else
{
decPercentage = (((decimal)imgSourceImage.Size.Height - (decimal)m_sMaxThumbNailDimensions.Height) / (decimal)imgSourceImage.Size.Height);
decPixToSubstract = decPercentage * (decimal)imgSourceImage.Size.Width;
sThumbNailSizeToUse.Height = m_sMaxThumbNailDimensions.Height;
sThumbNailSizeToUse.Width = imgSourceImage.Size.Width - (int)decPixToSubstract;
} // End else of if (imgSourceImage.Size.Width > imgSourceImage.Size.Height)
} // End if (m_sMaxThumbNailDimensions.Width < imgSourceImage.Size.Width || m_sMaxThumbNailDimensions.Height < imgSourceImage.Size.Height)
else
{
sThumbNailSizeToUse.Width = imgSourceImage.Size.Width;
sThumbNailSizeToUse.Height = imgSourceImage.Size.Height;
} // End else of if (m_sMaxThumbNailDimensions.Width < imgSourceImage.Size.Width || m_sMaxThumbNailDimensions.Height < imgSourceImage.Size.Height)
using (System.Drawing.Bitmap bmpThumbnail = new System.Drawing.Bitmap(sThumbNailSizeToUse.Width, sThumbNailSizeToUse.Height))
{
bmpThumbnail.SetResolution(rez, rez);
using (System.Drawing.Image imgThumbNail = bmpThumbnail)
{
using (System.Drawing.Graphics gGraphicsContext = System.Drawing.Graphics.FromImage(imgThumbNail))
{
gGraphicsContext.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
gGraphicsContext.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
gGraphicsContext.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
System.Drawing.Rectangle rThumbnailDimension = new System.Drawing.Rectangle(0, 0, sThumbNailSizeToUse.Width, sThumbNailSizeToUse.Height);
gGraphicsContext.DrawImage(imgSourceImage, rThumbnailDimension);
} // End Using gGraphicsContext
imgThumbNail.Save(System.IO.Path.Combine(strPhysicalPath, strThumbnailFileName), ifOutputFormat);
} // End Using imgThumbNail
} // End Using bmpThumbnail
} // End Using imgSourceImage
} // End Try
catch (Exception ex)
{
System.Windows.Forms.MessageBox.Show(ex.Message);
//Response.Write(ex.Message);
} // End Catch
} // End Function GenerateThumbNail
public static System.IO.Stream GetThumbnailStream(
string strOrgFileName
, System.Drawing.Imaging.ImageFormat ifOutputFormat
)
{
return GetThumbnailStream(strOrgFileName, ifOutputFormat, 1024);
} // End Function GetThumbnailStream
public static System.IO.Stream GetThumbnailStream(
string strOrgFileName
,System.Drawing.Imaging.ImageFormat ifOutputFormat
,int rez
)
{
System.IO.MemoryStream ms = null;
try
{
using (System.Drawing.Image imgSourceImage = System.Drawing.Image.FromFile(strOrgFileName))
{
decimal decPixToSubstract = 0;
decimal decPercentage;
System.Drawing.Size sThumbNailSizeToUse = new System.Drawing.Size();
if (m_sMaxThumbNailDimensions.Width < imgSourceImage.Size.Width || m_sMaxThumbNailDimensions.Height < imgSourceImage.Size.Height)
{
if (imgSourceImage.Size.Width > imgSourceImage.Size.Height)
{
decPercentage = (((decimal)imgSourceImage.Size.Width - (decimal)m_sMaxThumbNailDimensions.Width) / (decimal)imgSourceImage.Size.Width);
decPixToSubstract = decPercentage * imgSourceImage.Size.Height;
sThumbNailSizeToUse.Width = m_sMaxThumbNailDimensions.Width;
sThumbNailSizeToUse.Height = imgSourceImage.Size.Height - (int)decPixToSubstract;
} // End if (imgSourceImage.Size.Width > imgSourceImage.Size.Height)
else
{
decPercentage = (((decimal)imgSourceImage.Size.Height - (decimal)m_sMaxThumbNailDimensions.Height) / (decimal)imgSourceImage.Size.Height);
decPixToSubstract = decPercentage * (decimal)imgSourceImage.Size.Width;
sThumbNailSizeToUse.Height = m_sMaxThumbNailDimensions.Height;
sThumbNailSizeToUse.Width = imgSourceImage.Size.Width - (int)decPixToSubstract;
} // End else of if (imgSourceImage.Size.Width > imgSourceImage.Size.Height)
} // End if (m_sMaxThumbNailDimensions.Width < imgSourceImage.Size.Width || m_sMaxThumbNailDimensions.Height < imgSourceImage.Size.Height)
else
{
sThumbNailSizeToUse.Width = imgSourceImage.Size.Width;
sThumbNailSizeToUse.Height = imgSourceImage.Size.Height;
} // End else of if (m_sMaxThumbNailDimensions.Width < imgSourceImage.Size.Width || m_sMaxThumbNailDimensions.Height < imgSourceImage.Size.Height)
using (System.Drawing.Bitmap bmpThumbnail = new System.Drawing.Bitmap(sThumbNailSizeToUse.Width, sThumbNailSizeToUse.Height))
{
bmpThumbnail.SetResolution(rez, rez);
using (System.Drawing.Image imgThumbNail = bmpThumbnail)
{
using (System.Drawing.Graphics gGraphicsContext = System.Drawing.Graphics.FromImage(imgThumbNail))
{
gGraphicsContext.CompositingQuality = System.Drawing.Drawing2D.CompositingQuality.HighQuality;
gGraphicsContext.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.HighQuality;
gGraphicsContext.InterpolationMode = System.Drawing.Drawing2D.InterpolationMode.HighQualityBicubic;
System.Drawing.Rectangle rThumbnailDimension = new System.Drawing.Rectangle(0, 0, sThumbNailSizeToUse.Width, sThumbNailSizeToUse.Height);
gGraphicsContext.DrawImage(imgSourceImage, rThumbnailDimension);
ms = new System.IO.MemoryStream();
imgThumbNail.Save(ms, ifOutputFormat);
ms.Position = 0;
} // End Using gGraphicsContext
} // End Using imgThumbNail
} // End Using bmpThumbnail
/*
byte[] buffer = null;
using (System.IO.MemoryStream ms = new System.IO.MemoryStream())
{
imgThumbNail.Save(ms, ifOutputFormat);
buffer = ms.ToArray();
}
*/
// Exerts from Page_Load method
//Response.ContentType = "image/" + extension;
//Response.OutputStream.Write(pBuffer, 0, pBuffer.Length);
//Response.End();
//imgThumbNail.Save(System.IO.Path.Combine(strPhysicalPath, strThumbnailFileName), ifOutputFormat);
} // End Using imgSourceImage
} // End Try
catch (Exception ex)
{
//Console.WriteLine(ex.Message);
System.Windows.Forms.MessageBox.Show(ex.Message);
//Response.Write(ex.Message);
} // End Catch
//System.Windows.Forms.MessageBox.Show("image/" + ifOutputFormat.ToString().ToLower());
return ms;
} // End Function GenerateThumbNail
} // End Class Imaging
} // End Namespace Tools
这似乎是一个涉及的错误分块传输编码 in
Class: System.Web.HttpResponse (or one of its dependencies)
Method: TransmitFile(string filename)
Edit:
构造函数中有这样一段代码：
if (worker_request != null)
use_chunked = (worker_request.GetHttpVersion () == "HTTP/1.1");
修补它以检查 CGI（如果是 CGI，则服务器处理文件传输，因此可能没有从 FastCGI 服务器返回的分块编码）RFC 3875.
internal HttpResponse (HttpWorkerRequest worker_request, HttpContext context) : this ()
{
WorkerRequest = worker_request;
this.context = context;
#if !TARGET_J2EE
if (worker_request != null)
{
if(worker_request.GetHttpVersion () == "HTTP/1.1")
{
string GatewayIface = context.Request.ServerVariables["GATEWAY_INTERFACE"];
use_chunked = (GatewayIface == null || !GatewayIface.StartsWith("CGI"));
}
else
use_chunked = false;
}
#endif
writer = new HttpWriter (this);
}
添加了补丁https://bugzilla.xamarin.com/show_bug.cgi?id=10001
在单声道 3.2.3 中已修复