Why does this snippet in a blog post make WordPress crash?

And of course after I ask the question, I find the solution… Apparently it’s caused by a trigger happy Mod_Security.

Adding these lines to the .htaccess file makes it go away nicely:

<IfModule mod_security.c>
  SetEnvIfNoCase Request_URI ^/wp-admin/(?:post|async-upload)\.php$ MODSEC_ENABLE=Off
  SetEnvIfNoCase Request_URI ^/xmlrpc\.php$ MODSEC_ENABLE=Off
  SecFilterDebugLevel 0
  SecFilterDefaultAction "deny,nolog,noauditlog,status:503"
</IfModule>

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