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301 Moved Permanently - a4019.com
HTTP Status: 301
User-Agent: Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; [email protected])
Server: NgxFence
Date: Sat, 17 May 2025 19:15:41 GMT
Content-Type: text/html
Content-Length: 165
Connection: close
Location: https://4019.vip/

HTTP Code 301 Moved Permanently

301 status code means that the requested resource has been permanently moved to a new URL. All future requests should use the new address.

When is Code 301 used?

  • When changing a website domain
  • When modifying URL structures
  • When setting up redirects for SEO

What does Code 301 mean for the user?

The browser will automatically redirect the user to the new address, and search engines will update their indexes.

502 Bad Gateway - http://4019.vip
HTTP Status: 502
User-Agent: Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; [email protected])
Server: NgxFence
Date: Sat, 17 May 2025 19:15:42 GMT
Content-Type: text/html
Content-Length: 4266
Connection: close
X-Cache: DYNAMIC

HTTP Code 502 Bad Gateway

502 status code indicates that the server acting as a gateway or proxy received an invalid response from an upstream server.

When is Code 502 used?

  • When a server is down or unreachable
  • When there is a misconfiguration in server settings
  • When a reverse proxy or load balancer fails to connect to the backend server

What does Code 502 mean for the user?

The user cannot access the requested resource due to a temporary issue between servers.

GET / HTTP/1.1
Host: a4019.com
Accept: */*
User-Agent: Mozilla/5.0 AppleWebKit/537.36 (KHTML, like Gecko; compatible; ClaudeBot/1.0; [email protected])

<html>
<head>
<title>502</title>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<link href='https://libs.jshub.com/font-awesome/5.10.0-12/css/fontawesome.min.css' rel='stylesheet'>
<link href='https://libs.jshub.com/font-awesome/5.10.0-12/css/solid.min.css' rel='stylesheet'>
<style>
body{margin: 0px;padding: 0px;font-family: Tahoma, Pingfang SC, Microsoft YaHei, SimSun;font-size: 12px;color: #353535;background-color: #efefef;}
.brdiv {clear: both;width: 100%;height: 0px;line-height: 0px;padding: 0px;margin: 0px;border: none;background-color: transparent;background-image: none;}
.mdiv{position: absolute;top: 50%;left: 50%;background-color: #fff;width: 800px;height: auto;transform: translate(-50%, -50%);box-shadow: 2px 5px 5px 2px #dfdfdf;padding-bottom: 20px;}
.mtd{width: 100%; height: 10px; background-color: #376888;}
.mid{margin: 0px auto; text-align: center; padding: 30px 0px; width: 750px; border-bottom: solid 1px #dfdfdf;}
.miitm{width: 215px;float: left;font-size: 80px;text-align: center;position: relative;color: #376888;}
.miitm .mti{width: 100%;height: 30px;float: left;font-size: 15px;font-weight: bold;color: #353535;}
.miitm .fa-check-circle,.miitm .fa-times-circle,.miitm .fa-question-circle{font-size: 20px;position: absolute;bottom: 0px;right: 60px;}
.mil{ width: 60px;height: 80px;float: left;font-size: 80px;color: #ececec;text-align: center;margin-left: -10px;margin-top: 30px;position: relative;}
.mil .fa-check-circle,.mil .fa-times-circle,.mil .fa-question-circle{font-size: 40px;position: absolute;top: 22px;left: 20px;}
.miitm .fa-check-circle,.mil .fa-check-circle{color: #4CAF50;}
.miitm .fa-times-circle,.mil .fa-times-circle{color: #E91E63;}
.miitm .fa-question-circle,.mil .fa-question-circle{color: #1E79E9;}
.cmsg{width: 700px;height: auto;margin: 0px auto;padding: 10px 0px;}
.cnum{float: left;font-size: 38px;margin-left: 50px;}
.cmes{float: left;font-size: 15px;font-weight: bold;margin-top: 20px;margin-left: 20px;}
.omsg{width: 600px;height: auto;margin: 0px auto;padding: 10px 0px;}
.ottl{font-size: 15px;height: 30px;}
.oitm{float: left;height: 25px;line-height: 25px;color: #959595;overflow: hidden;}
.blk{display: block;line-height: normal;}
.fmsg{width: 750px;height: auto;margin: 10px auto;padding: 20px 0px; border-top: solid 1px #dfdfdf;}
.fitm{width: 100%; text-align:center; float: left;height: 25px;line-height: 25px;overflow: hidden;}
a{text-decoration: none;}
a:hover{text-decoration:underline;}
a:visited{color: blue;}
.reqid{font-family: monospace;font-weight: bold;}
.mwm{z-index: -1;width: 90%;text-align: right;position: absolute;margin-top: 45px;font-size: 190px;color: #ececec;}
</style>
</head>
<body>
<div class="mdiv">
<div class="mtd"></div>
<div class="mid">
<div class="miitm"><div class="mti">用户</div><span class="fa fa-desktop blk"></span></div>
<div class="mil"><span class="fa fa-exchange-alt blk"></span><span class="fa fa-check-circle blk"></span></div>
<div class="miitm"><div class="mti">平台</div><span class="fa fa-cloud blk"></span></div>
<div class="mil"><span class="fa fa-exchange-alt blk"></span><span class="fa fa-times-circle blk"></span></div>
<div class="miitm"><div class="mti">源站</div><span class="fa fa-server blk"></span></div>
<div class="brdiv"></div>
</div>
<div class="mwm"><span class="fa fa-cogs blk" <="" span=""></span></div>
<div class="cmsg">
<div class="cnum">502</div><div class="cmes">请求失败</div><div class="brdiv"></div>
</div>
<div class="omsg">
<div class="ottl">可能原因:</div><div class="brdiv"></div>
<div class="oitm"><li>源站配置错误或者未生效</li></div><div class="brdiv"></div>
<div class="oitm"><li>源站的网络发生故障</li></div><div class="brdiv"></div>
</div>
<div class="omsg">
<div class="ottl">访问信息:</div><div class="brdiv"></div>
<div class="oitm"><li>访问时间: <span>2025-05-17 19:15:42 GMT</span></li></div><div class="brdiv"></div>
<div class="oitm"><li>访问来源: <span>135.181.60.100</span></li></div><div class="brdiv"></div>
</div>
<div class="fmsg">
<div class="fitm">Request ID: <span class="reqid">c7d9efa1e16c3d32b2251f4561e5d451</span> - Performance & Security by <a href="https://www.ngxfence.com">NgxFence</a></div>
</div>
</div>
</body>
</html>

Whois info of domain

Domain Name: A4019.COM
Registry Domain ID: 2914409104_DOMAIN_COM-VRSN
Registrar WHOIS Server: whois.dynadot.com
Registrar URL: http://www.dynadot.com
Updated Date: 2025-04-16T07:35:43Z
Creation Date: 2024-09-06T13:09:53Z
Registry Expiry Date: 2025-09-06T13:09:53Z
Registrar: Dynadot Inc
Registrar IANA ID: 472
Registrar Abuse Contact Email: [email protected]
Registrar Abuse Contact Phone: +16502620100
Domain Status: clientTransferProhibited https://icann.org/epp#clientTransferProhibited
Name Server: NS1.DYNA-NS.NET
Name Server: NS2.DYNA-NS.NET
DNSSEC: unsigned
URL of the ICANN Whois Inaccuracy Complaint Form: https://www.icann.org/wicf/
>>> Last update of whois database: 2025-05-17T19:15:31Z <<<
For more information on Whois status codes, please visit https://icann.org/epp
NOTICE: The expiration date displayed in this record is the date the
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