Acronym for the Common Gateway Interface A standard that defines
the conditions a CGI program should be able to expect. A CGI
program is run by a WebServer to process certain requests. It is
expected to return output to be sent back as the server's
response to that request. That output will often be a WebPage,
but might also be anything else the server can send, like an
image or a binary file. The standard specifies
EnvironmentVariables that provide information about the request,
like PATH_INFO, QUERY_STRING, REMOTE_USER, and more, as well as
details such as where STDIN/OUT/ERR should be connected.
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