https://developers.weixin.qq.com/miniprogram/dev/OpenApiDoc/qrcode-link/short-link/generateShortLink.html

{
    "page_url": "/pages/publishHomework/publishHomework?query1=q1",
    "page_title": "Homework title", 
    "is_permanent":false
} 

这里的page_url中的地址第一个“/”去掉。