Have 3 independent servers (America, Europe, Asia) confirm if your website is really down.
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https://www.website-down.com/https%3A%2F%2Fwww.website-down.com%2Fhttps%3A%2F%2Fwww.website-down.com%2Fhttp%253A%252F%252F144chan.vn%252FboyYOUR WEBSITE IS UP
is https://www.website-down.com/https%3A%2F%2Fwww.website-down.com%2Fhttps%3A%2F%2Fwww.website-down.com%2Fhttp%253A%252F%252F144chan.vn%252Fboy working?