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/usr/share/c_icap/templates/srv_content_filtering/en/BLOCK is in libc-icap-mod-contentfiltering 1:0.4.2-1build1.

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<html>
 <head>
   <title>BLOCKED</title>
</head>

<body>
<h1>Web page access blocked</h1>


You tried to download web content which blocked: 
<br>
The Http location is: 
<b>  %huo </b>

<br>
Action: <b>%CFA</nb>

<br>
Reason: <b>%CFF{%CFC %CFR}</b>

<br>
The scores list:
<b> %CFS</b>

<p>
  For more information contact your system administrator

<hr>
<p>
This message generated by C-ICAP service: <b> %iu </b>

</p>

</body>
</html>