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file_get_contents work with direct typed url and not with automatically obtained url
$url = $result_from_webservice->url;

if( file_get_contents( $url ) ){
    echo 'ok';
}
else{
    echo 'error';
}

echo $result_from_webservice->url;

$url = 'https://site.com/page.php?foo1=bar1&foo2=bar2';

$url = $result_from_webservice->url;
    $url = urldecode( $url );

$url = (string)$result_from_webservice->url;