Internal Server Error : encoding change in POST with euro symbol

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Hi,

I have a functional installation of askbot but, when sending data, Apache is weird :

• data without euro symbol : charset : utf-8 (OK)
• data with euro symbol : charset : iso-8859-1 (????) and Internal Server Error

I try to add AddDefaultCharset utf-8 in apache config but this is not working...

Any suggestion please ?