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|
=encoding utf-8
=head1 NAME
ngx_http_map_module - Module ngx_http_map_module
=head1
The C<ngx_http_map_module> module creates variables
whose values depend on values of other variables.
=head1 Example Configuration
map $http_host $name {
hostnames;
default 0;
example.com 1;
*.example.com 1;
example.org 2;
*.example.org 2;
.example.net 3;
wap.* 4;
}
map $http_user_agent $mobile {
default 0;
"~Opera Mini" 1;
}
=head1 Directives
=head2 map
B<syntax:> map I<
I<C<string>>
I<C<$variable>> { B<...> } >
B<context:> I<http>
Creates a new variable whose value
depends on values of one or more of the source variables
specified in the first parameter.
B<NOTE>
Before version 0.9.0 only a single variable could be
specified in the first parameter.
B<NOTE>
Since variables are evaluated only when they are used, the mere declaration
even of a large number of “C<map>” variables
does not add any extra costs to request processing.
Parameters inside the C<map> block specify a mapping
between source and resulting values.
Source values are specified as strings or regular expressions (0.9.6).
Strings are matched ignoring the case.
A regular expression should either start from the “C<~>”
symbol for a case-sensitive matching, or from the “C<~*>”
symbols (1.0.4) for case-insensitive matching.
A regular expression can contain named and positional captures
that can later be used in other directives along with the
resulting variable.
If a source value matches one of the names of special parameters
described below, it should be prefixed with the “C<\>” symbol.
The resulting value can contain text,
variable (0.9.0), and their combination (1.11.0).
The following special parameters are also supported:
=over
=item C<default> I<C<value>>
sets the resulting value if the source value matches none
of the specified variants.
When C<default> is not specified, the default
resulting value will be an empty string.
=item C<hostnames>
indicates that source values can be hostnames with a prefix or suffix mask:
*.example.com 1;
example.* 1;
The following two records
example.com 1;
*.example.com 1;
can be combined:
.example.com 1;
This parameter should be specified before the list of values.
=item C<include> I<C<file>>
includes a file with values.
There can be several inclusions.
=item C<volatile>
indicates that the variable is not cacheable (1.11.7).
=back
If the source value matches more than one of the specified variants,
e.g. both a mask and a regular expression match, the first matching
variant will be chosen, in the following order of priority:
=over
=item 1.
string value without a mask
=item 2.
longest string value with a prefix mask,
e.g. “C<*.example.com>”
=item 3.
longest string value with a suffix mask,
e.g. “C<mail.*>”
=item 4.
first matching regular expression
(in order of appearance in a configuration file)
=item 5.
default value
=back
=head2 map_hash_bucket_size
B<syntax:> map_hash_bucket_size I<I<C<size>>>
B<default:> I<32E<verbar>64E<verbar>128>
B<context:> I<http>
Sets the bucket size for the L</map> variables hash tables.
Default value depends on the processor’s cache line size.
The details of setting up hash tables are provided in a separate
L<document|hash>.
=head2 map_hash_max_size
B<syntax:> map_hash_max_size I<I<C<size>>>
B<default:> I<2048>
B<context:> I<http>
Sets the maximum I<C<size>> of the L</map> variables
hash tables.
The details of setting up hash tables are provided in a separate
L<document|hash>.
|
