很简单的一个jQuery AJAX请求文件，IE8下报：1Could not complete the operation due to error c00ce56e.
检查网上都说是编码问题，不过写的不是太明确，因为我们服务器的文件编码都已经是UTF-8
最后找到说明：
The problem occurs when setting the charset of a response to a XMLHttpRequest to utf8 instead of UTF-8 or ISO-8859-1 instead of ISO8859_1. IE7 is very strict on naming of the charsets.
“ISO8859_1” is the canonical representation of the Latin-1 character encoding string in the Java language and class libraries. The standard that is defined by the Internet Assigned Numbers Authority, however, is “ISO-8859-1”, which is not an accepted alias.
For more information refer: http://support.microsoft.com/default.aspx?scid=kb;en-us;304625
于是打开nginx的配置文件，把所有“utf8”替换成“UTF-8”，问题