During security check, its reported that “The Content-Type HTTP header is missing charset attribute” is missing for js and css file.
Please check below screenshot:
My HTML Was look like below before i have added the charset
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<script type="text/javascript" src="/backend/web/assets/3faf0a44/jquery.js"></script>
</head>
</html>
Then i have added the charset=”UTF-8″ in
<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<script type="text/javascript" src="/backend/web/assets/3faf0a44/jquery.js" charset="UTF-8"></script>
</head>
</html>
Still Charset is not added in Response Header, Please check below screenshot:
So what should i do so my Content-Type header changed to below:
content-type: application/javascript; charset=utf-8
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Answer
Let me try to answer, you can do that by editing apache2.conf (for Debian like OS(es) ) or httpd.conf ( CentOS like OS(es) ) and add following lines:
#Set the correct Char set so don't need to set it per page. AddDefaultCharset utf-8 #for css, js, etc. AddCharset utf-8 .htm .html .js .css
Source:

