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June 15, 2023 20:13
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HTML5 and some light CSS. Useful for my AWS testing.
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<!DOCTYPE html> | |
<html lang=en> | |
<head> | |
<meta charset="utf-8"> | |
<meta http-equiv="X-UA-Compatible" content="IE=edge"> | |
<title>AWS Test</title> | |
<meta name="description" content=""> | |
<meta name="viewport" content="width=device-width, initial-scale=1"> | |
<style> | |
body {background-color: AliceBlue;} | |
h1 {font-size: 3vw; font-family: 'Open Sans', sans-serif;} | |
p {font-size: 1vw; font-family: 'Open Sans', sans-serif;} | |
</style> | |
<script> | |
var xhr = new XMLHttpRequest; | |
xhr.open("GET", "public-ipv4.txt", true); | |
// disable browser caching in request header | |
xhr.setRequestHeader('Cache-Control', 'no-cache, no-store, max-age=0'); | |
xhr.setRequestHeader('Expires', 'Thu, 1 Jan 1970 00:00:00 GMT'); | |
xhr.setRequestHeader('Pragma', 'no-cache'); | |
xhr.onreadystatechange = function() { | |
if (xhr.readyState == 4 && xhr.status == 200) { | |
document.getElementById("IPv4").innerHTML = (xhr.responseText); | |
} | |
} | |
xhr.send(); | |
</script> | |
</head> | |
<body> | |
<h1>Hello from AWS!</h1> | |
<br /> | |
<p>EC2 Instance IPv4 address: <span id="IPv4"></span></p> | |
</body> | |
</html> |
One way around that is to record the EC2 public IP to a database, and make a call to that from the server. The table would use the instanceId as the key.
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This HTML file is currently called from an AWS bootstrap script that provides the
public-ipv4.txt
file.One thing to note: the XMLHTTPRequest can call the
public-ipv4.txt
file from any server in the load balancer, so it isn't a true indication of which server you're connecting to, just an indication that you're indeed connecting to a different server.