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In that case C<< $ENV{CONTENT_LENGTH} >> is taken as the number of bytes to be read from C<STDIN>
and those bytes are used as the missing input argument.
 
The environment variables QUERY_STRING, REQUEST_METHOD and CONTENT_LENGTH is
typically set by a web server following the CGI standard (which Apache and
most of them can do I guess) or in mod_perl by Apache. Although you are
probably better off using L<CGI>. Or C<< $R->args() >> or C<< $R->content() >> in mod_perl.
 
B<Output:>
 
C<webparams()> returns a hash of the key/value pairs in the input argument. Url-decoded.
 
If an input string has more than one occurrence of the same key, that keys value in the returned hash will become concatenated each value separated by a C<,> char. (A comma char)
 
Examples:
 
 use Acme::Tools;
 my %R=webparams();
 print "Content-Type: text/plain\n\n";                          # or rather \cM\cJ\cM\cJ instead of \n\n to be http-compliant
 print "My name is $R{name}";