b load returning parsing error

You could use subst twice to get the variable values and not have to escape characters in the static content:

when RULE_INIT {
set static::responseContent [subst {
unescaped text
"hi"
{text}
\${static::site-identDDE}
}]
}

when HTTP_REQUEST {
set static::site-identDDE "ddewcsp"
HTTP::respond 200 content [subst $static::responseContent]
}

< Connection: Keep-Alive

< Content-Length: 45

unescaped text

"hi"

{text}

ddewcsp

Aaron