Edge Side Includes is a programming language created in 2001.
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Edge Side Includes or ESI is a small markup language for edge level dynamic web content assembly. The purpose of ESI is to tackle the problem of web infrastructure scaling. It is an application of edge computing. Read more on Wikipedia...
<esi:include src="http://example.com/1.html" alt="http://bak.example.com/2.html" onerror="continue"/>