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varnishcache
varnish-cache
Commits
79c241e5
Commit
79c241e5
authored
Mar 14, 2014
by
Tollef Fog Heen
Committed by
Tollef Fog Heen
Mar 14, 2014
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introduction.rst
doc/sphinx/tutorial/introduction.rst
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doc/sphinx/tutorial/introduction.rst
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79c241e5
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@@ -3,7 +3,7 @@
The fundamentals of web proxy caching with Varnish
--------------------------------------------------
Varnish is a caching HTTP reverse proxy. It rec
ie
ves requests from
Varnish is a caching HTTP reverse proxy. It rec
ei
ves requests from
clients and tries to answer them from its cache. If it cannot answer
the request from its cache it will forward the request to the backend,
fetch the response, store it and deliver it to the client.
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@@ -14,11 +14,11 @@ typical application server, so you want to make sure to have it answer
as many of the requests as possible.
Varnish decides whether it can store the content or not based on the
response it
's
gets back from the backend. The backend can instruct
response it gets back from the backend. The backend can instruct
Varnish to cache the content with the HTTP response header
Cache-Control. There are a few other conditions where Varnish will not
cache, the most common one being cookies. Since cookies is a good
indication that a web object is person
lised, Varnish will with it'
s
indication that a web object is person
alised, Varnish will with it
s
default configuration, not cache it.
This behaviour and most other behaviour can be changed using policies
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@@ -29,7 +29,7 @@ Performance
~~~~~~~~~~~
Varnish has a modern architecture and is written with performance in
mind. It is usually bound by the speed of the network, effectivly
mind. It is usually bound by the speed of the network, effectiv
e
ly
turning performance into a non-issue. You get to focus on how your web
application work and you can allow yourself, to some degree, to care
less about performance and scalability.
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@@ -37,8 +37,8 @@ less about performance and scalability.
Flexibility
~~~~~~~~~~~
One of the key features of Varnish Cache, in addition to it
'
s
performance, is the flexibility of it
'
s configuration language,
One of the key features of Varnish Cache, in addition to its
performance, is the flexibility of its configuration language,
VCL. VCL enables you to write policies on how incoming requests should
be handled.
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@@ -68,7 +68,7 @@ You can get in touch with us trough many channels. For real time chat
you can reach us on IRC trough the server irc.linpro.net on the
#varnish and #varnish-hacking channels.
The are two mailing lists available. One for user questions and one
for development discussions. See varnish-cache.org/mailinglist for
for development discussions. See
https://www.
varnish-cache.org/mailinglist for
information and signup. There is also a web forum on the same site.
Now that you have a vague idea on what Varnish Cache is, let see if we
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