It's possible to set HTTP headers with htaccess?

Question

i have website on PHP and i wont to know how to set this HTTP headers:

• Last-Modified
• If-Modified-Since
• Cache-Control
• ETag

For Last-Modified i try this:

RewriteRule .* - [E=HTTP_IF_MODIFIED_SINCE:%{HTTP:If-Modified-Since}]
RewriteRule .* - [E=HTTP_IF_NONE_MATCH:%{HTTP:If-None-Match}]

For Cache-Control:

<FilesMatch ".(ico|jpg|jpeg|png|gif|js|css|swf|pdf)$">
     Header set Cache-Control "max-age=604800, public, must-revalidate" 
</FilesMatch>
<FilesMatch ".(html|htm|xml|txt|xsl)$">
     Header set Cache-Control "max-age=86400, public, must-revalidate" 
</FilesMatch>

For ETag this:

Header unset
ETag File
ETag None

But don't works and don't returned in headers. It's right method with htaccess, it's possible? In case of YES, how to make it?

Thank you so much on advise!

Answer 1

等待大神答复