apache 2.2 - How to use htaccess to rewrite to new base directory for files

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So I have a subdomain,
sub1.example.com, that is mapped to a directory located in the server's
root:
/subdomains/sub1/httpdocs/

I
have another subdomain, sub2.example.com, that is mapped to a different
directory:

/subdomains/sub2/httpdocs/

It's
at a hosting company that won't let me alter Apache conf
files.

I want to use the .htaccess file to allow
sub2 requests to be processed by the files that are located in the sub1 directory.
Almost like a symbolic link. I need to preserve the hostname. So href="http://sub2.example.com/test.php" rel="nofollow
noreferrer">http://sub2.example.com/test.php would access the same file as
http://sub1.example.com/test.php, but the hostnames would be
preserved.

I tried the following in
/subdomains/sub2/httpdocs/.htaccess:

RewriteEngine
            On

RewriteRule ^(.*)$
            /subdomains/sub1/httpdocs/$1

but
I'm a getting internal server error.

Any
suggestions?

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class="normal">Answer

The
^(.*)$ pattern captures the complete path component of the URL
which always begins with a /, therefore you should probably
remove the last / from your RewriteRule. This is how it should
be:

RewriteEngine
            On

RewriteRule ^(.*)$
            /subdomains/sub1/httpdocs$1

Or
make the pattern match everything except the first
/:

RewriteEngine
            On
RewriteRule ^/(.*)$
            /subdomains/sub1/httpdocs/$1