Raemaekers Mark wrote:
For me it is not clear why an accelerator mode WC is
faster then a Transparant Mode webcache.
This is how I understand both modes after googling for
about half a day on this topic :
WC IN TRANSPARANT MODE (WCTM), When an http request
hits the WCTM for the second time, then the WC will
send its cached contents back to the client.
Since the info is in the cache, the real web server
does not have to be contacted by the WCTM.
WC IN ACCELERATOR MODE (WCAM) : when an http request
hits the WCAM for the second time,the the WC will look
if this request is in its cache and send the cached
response of this request back to the client. Since the
info is in the cache, the real web server does not
have to be contaced by the WCAM.
In both cases (from the second request onwards) the
real web server is not contacted.
So, what exactly makes an accelerator mode WC go
faster then ?
Nothing. Neither name accurately reflects the operation of the cache.
Whats the confusion?
proxy - software that sits between a web server and a web-client with
purpose of resource saving or improving web service to the clients.
intercepting proxy - software that performs as a proxy, but additionally
can handle traffic redirected to it by a FW without the web-clients
knowledge. Usually typed 'transparent' by those who confuse
client-hidden with totally-invisible.
transparent proxy - software that performs all duties of proxy and
additionally spoofs/hide its IP from both parties such that neither can
detect its existence.
reverse-proxy - software that performs many of the service duties of a
web-server. Redirecting all requests it can't handle to a separate
'true' web-server or more authoritative source.
accelerator - nickname for reverse-proxy.
Amos
--
Please use Squid 2.6STABLE17+ or 3.0STABLE1+
There are serious security advisories out on all earlier releases.
