Rewriting $uri to include session id from cookie

[Oliver Weichhold]

In order to implement user dependended memcached lookup for URIs I would
like to rewrite the URI to include the value of the session_id cookie as
a query parameter but somehow I can'g get it working. I've tried these
variations:

location /
{
  # SNIP - Solution A - not working
  if ($http_cookie !~ "session_id=?(.+)")
  {
    rewrite ^?(.*) $2?session_id=$1;
  }
  # SNIP - Solution A - not working

  # SNIP - Solution B - not working
  if ($http_cookie !~ "session_id=?(.+)")
  {
    set $tmp $1
    rewrite ^?(.*) $1?session_id=$tmp;
  }
  # SNIP - Solution B - not working

  # Check if local memcached server can answer this request
  set $memcached_key $uri;
  memcached_pass 127.0.0.1:11211;
  error_page 404 = @cache_miss;
}

location @cache_miss
{
  proxy_pass http://backend;
}

Could someone tell me what I'm doing wrong?
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