The Content-Type HTTP header is missing charset attribute

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>

JavaScript
​x
 
<!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>

JavaScript
 
<!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

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

JavaScript
 
#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:

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Answer