Github user wenjiezhang2013 commented on the pull request:
https://github.com/apache/tomcat/pull/25#issuecomment-166700042
If you read ```The HTTP specification is clear that if no character set is
specified for media sub-types of the "text" media type, the ISO-8859-1
character set must be used. However, browsers may attempt to auto-detect the
character set. This may be exploited by an attacker to perform an XSS attack.
Internet Explorer and other browsers have an option to enable this behavior.```
from
http://tomcat.apache.org/tomcat-8.0-doc/config/filter.html#Add_Default_Character_Set_Filter,
you will be able to understand the problem
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