Perl in a Nutshell

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The LWP Library
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 $url->abs([base, [scheme]])

Returns the absolute URL, given a base. If invoked with no parameters, any previous definition of the base is used. The second parameter is a Boolean that modifies abs's behavior. When the second parameter is nonzero, abs will accept a relative URL with a scheme but no host, like "http:index.html".

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17.5 The URI ModuleBook IndexReference: as_string