!!! Overview [1]
[{$pagename}] is an [HTTP Status Code] indicating the [protocol] the [server] is switching to as requested by a client which sent the message including the Upgrade [HTTP Request Header].


!! More Information
There might be more information for this subject on one of the following:
[{ReferringPagesPlugin before='*' after='\n' }]
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* [#1] - [101 Switching Protocols|https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/101|target=_blank]