User blog comment:Nanamin/Bypassing the DMM Error Area/@comment-26878963-20150811131712/@comment-26154973-20150811142205

https://developers.google.com/web/tools/setup/workspace/setup-devtools#network-panel-monitor-network-performance

https://developers.google.com/web/tools/profile-performance/network-performance/resource-loading#http-headers

You can check the first value of ckcy after loading the direct link (open network tab, load the link, then click on app_id=825012/ path, should be the first entry), it's in Cookie field in Request headers, if it's 1 (and you're logged in, with Japanese interface, etc.), then it's pretty mysterious.