md5 as memcached_key

[Geoff Geoff]

 Hello,

 Does anyone know if nginx can calculate the md5 of a $request_uri
string?  I'd like to set the $memcached_key as the md5 of the
request_uri when passing requests for cached content to my memcached
instance.

 In concept the directive might look like this;

  location /testing {
  set $memcached_key $md5($request_uri);
  memcached_pass localhost:11211;
  }

Thanks!
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