<diagnostics>
    <diagnostic xmlns="http://www.loc.gov/zing/srw/diagnostic/">
        <uri>info:srw/diagnostic/1/1</uri>
        <details>
            <url>http://sru2.visual-library.de/mumok?operation=searchRetrieve&amp;query=dc.title%3Dtest&amp;recordSchema=mods</url>
            <headers><header name="ACCEPT" value="*/*"/><header name="ACCEPT-ENCODING" value="gzip, br, zstd, deflate"/><header name="CONNECTION" value="Keep-Alive"/><header name="COOKIE" value="session_id=c2dc75421075caa7629da623641478d008449b5f"/><header name="HOST" value="sru2.visual-library.de"/><header name="Remote-Addr" value="192.168.1.13"/><header name="USER-AGENT" value="Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; +claudebot@anthropic.com)"/><header name="X-FORWARDED-FOR" value="216.73.216.81"/><header name="X-FORWARDED-HOST" value="sru2.visual-library.de"/><header name="X-FORWARDED-SERVER" value="sru2.visual-library.de"/></headers>
            <params><param name="operation" value="searchRetrieve"/><param name="query" value="dc.title=test"/><param name="recordSchema" value="mods"/></params>
            <additional><name>InvalidApiKey</name><hint>ApiKey authentication failed</hint><msg>apikey not provided</msg><mdrevision>0</mdrevision><area>searchRetrieve</area></additional>
            </details>
        <message>An error has occured: InvalidApiKey - apikey not provided</message>
    </diagnostic>
</diagnostics>