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varnishcache
varnish-cache
Commits
cf333085
Commit
cf333085
authored
Apr 11, 2014
by
Federico G. Schwindt
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vcl_hash() returns lookup now
While here fmt(1) the text.
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6cb0f12a
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vcl-hashing.rst
doc/sphinx/users-guide/vcl-hashing.rst
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doc/sphinx/users-guide/vcl-hashing.rst
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cf333085
Hashing
-------
Internally, when Varnish stores content in the cache it stores the object
together with a hash
key to find the object again. In the default setup this key is
calculated based on the content of the *Host* header or the IP address
of the server and the URL.
Internally, when Varnish stores content in the cache it stores the object
together with a hash key to find the object again. In the default setup
this key is calculated based on the content of the *Host* header or the
IP address
of the server and the URL.
Behold the `default vcl`::
...
...
@@ -15,11 +15,11 @@ Behold the `default vcl`::
} else {
hash_data(server.ip);
}
return (hash
);
return (lookup
);
}
As you can see it first checks in `req.url` then `req.http.host` if
it
exists. It is worth pointing out that Varnish doesn't lowercase the
As you can see it first checks in `req.url` then `req.http.host` if
it
exists. It is worth pointing out that Varnish doesn't lowercase the
hostname or the URL before hashing it so in theory having "Varnish.org/"
and "varnish.org/" would result in different cache entries. Browsers
however, tend to lowercase hostnames.
...
...
@@ -29,9 +29,8 @@ serve up different content to different clients based on arbitrary
criteria.
Let's say you want to serve pages in different languages to your users
based on where their IP address is located. You would need some Vmod
to get a country code and then put it into the hash. It might look
like this.
based on where their IP address is located. You would need some Vmod to
get a country code and then put it into the hash. It might look like this.
In `vcl_recv`::
...
...
@@ -43,8 +42,7 @@ And then add a `vcl_hash`::
hash_data(req.http.X-Country-Code);
}
As the default VCL will take care of adding the host and URL to the
hash we don't have to do anything else. Be careful calling
``return(hash)`` as this will abort the execution of the default VCL and
Varnish can end up returning data based on
more or less random inputs.
As the default VCL will take care of adding the host and URL to the hash
we don't have to do anything else. Be careful calling ``return (lookup)``
as this will abort the execution of the default VCL and Varnish can end
up returning data based on more or less random inputs.
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