django提交表单提示"You called this URL via POST, but the URL doesn't end in a slash and you have APPEND_SL

django提交表单提示"You called this URL via POST, but the URL doesn't end in a slash and you have APPEND_SL

原因：

表单action字段没有以 '/' 结尾

讲action 修改为 action="/a/b/"即可修复