背景:先是在油猴中发现一个“B站哔哩哔哩使用增强”的插件,据说可以下载B站视频,如图: 点击第二步,进到一个mp4视频链接里面 有意思的来了,点击视频里那三个点,再点击下载按钮  提示保存为 html 而不是 mp4,这还不是最重要的 最重要的是当点击保存,提示“无法从网站上提取文件” 哪怕在网页上按 ctrl + s,保存网页也不行。 用迅雷直接下载这个视频地址也下载不了,这是为啥呢???? 地址为(需要请求头中有Referer,否则打开是403):[https://xy42x49x119x247xy.mcdn.bilivideo.cn:4483/upgcxcode/30/28/1275632830/1275632830-1-192.mp4?e=ig8euxZM2rNcNbRj7bdVhwdlhWTjhwdVhoNvNC8BqJIzNbfqXBvEqxTEto8BTrNvN0GvT90W5JZMkX_YN0MvXg8gNEV4NC8xNEV4N03eN0B5tZlqNxTEto8BTrNvNeZVuJ10Kj_g2UB02J0mN0B5tZlqNCNEto8BTrNvNC7MTX502C8f2jmMQJ6mqF2fka1mqx6gqj0eN0B599M=&uipk=5&nbs=1&deadline=1695882231&gen=playurlv2&os=mcdn&oi=1026566306&trid=00007a31ac96e7764113974978b7bdbd3db3u&mid=39165104&platform=pc&upsig=fb03009f8b265bfd96dd2a328cfdb856&uparams=e,uipk,nbs,deadline,gen,os,oi,trid,mid,platform&mcdnid=14000235&bvc=vod&nettype=0&orderid=0,3&buvid=33ED77B4-2BFB-35E9-A673-277ADEF5941984372infoc&build=0&f=u_0_0&agrr=0&bw=166033&logo=A0002000](https://link.segmentfault.com/?enc=FKb7JW%2FY%2BuCBKGTyjeIvhQ%3D%3D.mcdVp%2FEYhZCvrxUiUfxjVRyC7pSt%2BWryHis72FPesGTEmlw7FjV2c0%2FnQC%2BLGvEQ8FSfrg%2FitTbKnG%2FNMwJkzNT16wBp8St3Vi82RF5Y04wkPuMGiET7EaPU2oBlwqQIMNpSyTow2Bqd3Nbok%2F%2Fmdo6XTLcEpsDP0tYWF8fnT5eJjY6ughKivZYUem%2B16RYr6b%2Bqcr2ncpLwVv2%2Flp4Ehnl6XdN87TwyxDNt2pqcu2kU4AXgEQpISbr%2BuPWFvoVfBdklEDEqCrdC%2FvL5gwTrwsoYy3VxVICJCt59bNXbj06%2FDrhSOA%2Fmmw54ZESyoQWxZeN6EiG2Nl1LQqoLzmLOS4eUOM8ZwT4%2FPieDRwvrl4Lb4Svw1VIl%2Btj7TSHvkmXEGrYu4aExEDaZjooizu57cDwBlYIJmtcipj1GruphpZJsF9wb68u%2BdFzkAyZWcV%2FBsLzN3jawn7nPijINcCNI4RSJAfnmiLgq6Wbtq9uKEEB9LolLU%2Bl7HBT%2B3WMLIFbRPyte43G4W03F04qU32G7DNapXrM3ZOG8sWp6nOkDz%2FCnd4SEXmoQui0cvy4oBVASyGAccKcpCcHjdNIMoDIz855FoT6VNN13qTZuP4a1OM2wHhMqLAitcODRbVYMeL73kUu%2FLkopHjn9cPVAeCdxfEjPh4ERFiS7e55wwh3jpoqt6jq8SmzTADFHj37Q%2FL4psYtgO9VTI5zSJYBftRIBC%2F8SEfrD88IJRB4U%2FidzV6jS1%2Bs5JV35X2uAXfY%2B93WPRakHrVRzKNgUM0MEbx44Y8yCIobARDhTUM1G6x%2F9CWuTDLFOMfua8VmKX1M5MaLTe%2FobLw8IJwSh1YTAacj73XEnUv0aw4lu0ATJWl9vdHKRHQ%2BNshNoq1wuvkBP8NRBoyvcz5dUdBsh99GrWaafAw%3D%3D)