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xquery version "3.0";

import module namespace http = "http://expath.org/ns/http-client";

let $url := 'http://history.state.gov/education/modules/border-vanishes-intro'
let $links := doc($url)//*:a[ends-with(@href, '.pdf')]
return
    <results n="{count($links)}">{
        for $link in $links
        let $href := if (starts-with($link/@href, '//')) then concat('http:', $link/@href) else $link/@href/string()
        let $request := <http:request href="{$href}" method="head"/>
        let $response := http:send-request($request)
        return 
            <link>
                <url>{$href}</url>
                <status>{$response/@status/string()}</status>
            </link>
    }</results>