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Determine in php script if connected to internet?
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How do you detect a VPN or Proxy connection?
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How to PHP server-side check if a url of a web site is valid?
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What is the canonical way to determine commandline vs. http execution of a PHP script?
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Can a website know if I am running a userscript?
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PHP: If internet explorer 6, 7, 8 , or 9
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Fast way to check if a server is accessible over the network in C#
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Check if db connection is closed - php
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Detect if Android device has Internet connection
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PHP: get the browser name
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Command for determining my public IP?
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Can You Get A Users Local LAN IP Address Via JavaScript?
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Java detect lost connection
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Get a stack trace of a running or hung PHP script
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How do I check for a network connection?
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How do I check connection type (WiFi/LAN/WWAN) using HTML5/JavaScript?
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What is the best way to check for Internet connectivity using .NET?