如果图像路径设置不正确，很可能会发生这种情况.例如，相对于当前目录"images/myimage.gif"，相对于网络根目录"/images/myimage.gif".

This might well occur if your image path is set incorrectly. For example relative to current directory "images/myimage.gif" vs relative to web root "/images/myimage.gif".

对"text/html"的引用可能表明服务器正在返回错误.

The reference to "text/html" might suggest you have an error being returned by the server.