=== HTTP code : 200 ===

Response headers
================
HTTP/1.1 200 OK
Server: nginx
Date: Mon, 29 Jul 2019 01:40:10 GMT
Content-Type: text/html
Connection: close
Vary: Accept-Encoding
Vary: Accept-Encoding
Vary: Accept-Encoding
APCCD: Hit
Access-Control-Allow-Origin: *
Sill-APC: Hit
Cache-To-CIR: hit
Function-GSBK: non-work
Cache-To-MSIR: miss

Request headers
================
HEAD / HTTP/1.1
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.102 Safari/537.36
Host: www.ssdpterps.org
Accept: */*
Referer: https://ssdp.org
Connection: close


Link is valid.