Send request:
https://commons.wikimedia.org/w/api.php?action=query&format=xml&prop=imageinfo&titles=File:SSID-12398932%20%E5%94%90%E9%99%B8%E5%AE%A3%E5%85%AC%E7%BF%B0%E8%8B%91%E9%9B%86%201.pdf&iiprop=url|size&iiurlwidth=960&iiurlparam=page2-960px
Received result:
<?xml version="1.0"?><api batchcomplete=""><query><pages><page _idx="127237409" pageid="127237409" ns="6" title="File:SSID-12398932 唐陸宣公翰苑集 1.pdf" imagerepository="local"><imageinfo><ii size="42933804" width="350" height="660" pagecount="194" thumburl="https://upload.wikimedia.org/wikipedia/commons/thumb/a/aa/SSID-12398932_%E5%94%90%E9%99%B8%E5%AE%A3%E5%85%AC%E7%BF%B0%E8%8B%91%E9%9B%86_1.pdf/page2-350px-SSID-12398932_%E5%94%90%E9%99%B8%E5%AE%A3%E5%85%AC%E7%BF%B0%E8%8B%91%E9%9B%86_1.pdf.jpg" thumbwidth="960" thumbheight="1810" url="https://upload.wikimedia.org/wikipedia/commons/a/aa/SSID-12398932_%E5%94%90%E9%99%B8%E5%AE%A3%E5%85%AC%E7%BF%B0%E8%8B%91%E9%9B%86_1.pdf" descriptionurl="https://commons.wikimedia.org/wiki/File:SSID-12398932_%E5%94%90%E9%99%B8%E5%AE%A3%E5%85%AC%E7%BF%B0%E8%8B%91%E9%9B%86_1.pdf" descriptionshorturl="https://commons.wikimedia.org/w/index.php?curid=127237409" /></imageinfo></page></pages></query></api>
The returned thumbnail URL https://upload.wikimedia.org/wikipedia/commons/thumb/a/aa/SSID-12398932_%E5%94%90%E9%99%B8%E5%AE%A3%E5%85%AC%E7%BF%B0%E8%8B%91%E9%9B%86_1.pdf/page2-350px-SSID-12398932_%E5%94%90%E9%99%B8%E5%AE%A3%E5%85%AC%E7%BF%B0%E8%8B%91%E9%9B%86_1.pdf.jpg fails to load.
The result is: Use thumbnail steps listed on https://w.wiki/GHai. Please contact noc@wikimedia.org for further information (a765913)