squidclient HTTP request produces syntax error

I am trying to restart the squid service when it becomes unresponsive by simulating squidclient in a protocol check.

In verbose mode squidclient prints the HTTP request before the response.

$ /usr/local/squid/bin/squidclient -v mgr:info
Request:
GET cache_object://localhost/info HTTP/1.0
Host: localhost
User-Agent: squidclient/3.5.20
Accept: */*
Connection: close


.
HTTP/1.1 200 OK
[response truncated]

The control file squid.monitrc looks like this:

check process squid
  pidfile /usr/local/squid/var/run/squid.pid
  start program = "/etc/init.d/squid start"
    timeout 240 seconds
  stop program = "/etc/init.d/squid stop"
    timeout 240 seconds
  if failed
    port 3128
    protocol http
      http headers [
        Host: localhost,
        User-Agent: squidclient/squidclient/3.5.20,
        Accept: */*,
        Connection: close ]
    request "cache_object://localhost/info"
    then restart

The if failed clause of the check process statement should produce the same request and restart squid if it doesn't respond normally.

Instead it produces a syntax error:

$ sudo monit validate
/etc/monit/conf.d/squid.monitrc:15: syntax error '"cache_object://localhost/info"'

I am testing with monit 5.16 on Ubuntu 16.04. I know monit 5.16 is not in the version list, but it is the latest version packaged by Ubuntu. I don't see anything that would address this in the change log.

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