apache - How can I check the requested url before it being redirected on webserver -

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i want redirect subdomain subfolder on server. set a-record on dns server blog.domain.com go main server www.domain.com. using following htaccess (ubuntu server) - source:

rewritecond %{http_host} ^blog\.domain\.com rewriterule ^(.*)$ http://www.domain.com/blog/$1 [r=301]

sadly - it's not working. i've checked apache's access.log , saw, first request web server received www.domain.com , not blog.domain.com.

how can find out request-list check requests got wrong?


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