Refused to set unsafe header "Connection"
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参考 http://stackoverflow.com/questions/7210507/ajax-post-error-refused-to-set-unsafe-header-connection
使用ajax时,chrome报出异常:Refused to set unsafe header "Connection"。
xmlHttp.setRequestHeader("Content-length", params.length);
xmlHttp.setRequestHeader("Connection", "close");
在XMLHttpRequest不允许设置一些headers,他们会被浏览器自动设置。
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