I have configured a squid 3.1 proxy server.
Everything works great except for the X-Requested-With header.
I can't manage to figure out how to pass that header to the site I'm attempting to open via the proxy.

This is my current configuration:

request_header_access Allow allow all
request_header_access Authorization allow all
request_header_access WWW-Authenticate allow all
request_header_access Proxy-Authorization allow all
request_header_access Proxy-Authenticate allow all
request_header_access Cache-Control allow all
request_header_access Content-Encoding allow all
request_header_access Content-Length allow all
request_header_access Content-Type allow all
request_header_access Date allow all
request_header_access Expires allow all
request_header_access Host allow all
request_header_access If-Modified-Since allow all
request_header_access Last-Modified allow all
request_header_access Location allow all
request_header_access Pragma allow all
request_header_access Accept allow all
request_header_access Accept-Charset allow all
request_header_access Accept-Encoding allow all
request_header_access Accept-Language allow all
request_header_access Content-Language allow all
request_header_access Cookie allow all
request_header_access Mime-Version allow all
request_header_access Retry-After allow all
request_header_access Title allow all
request_header_access Connection allow all
request_header_access User-Agent allow all
request_header_access All deny all #remove all other headers


# delete "x-forwarder-for.." headers
forwarded_for delete
request_header_access Via deny all
request_header_access X-Forwarded-For deny all

I tried to add this line request_header_access X-Requested-With allow all to the configuration but apparently X-Requested-With is an unknown header name... Apparently I'm missing something?