Optional. Used to perform content matching. This allows
matching based on substrings and regular expressions, together
with their negations. Only the first 4 MB of an HTTP or
HTTPS check's response (and the first 1 MB of a TCP check's
response) are examined for purposes of content matching.
String or regex content to match. Maximum 1024 bytes. An
empty ``content`` string indicates no content matching is to
The type of content matcher that will be applied to the
server output, compared to the ``content`` string when the
check is run.