# File lib/moneta/adapters/couch.rb, line 49
      def store(key, value, options = {})
        response = @backend.head(key)
        body = value_to_body(value, response.status == 200 && response['etag'][1..-2])
        response = @backend.put(key, body, 'Content-Type' => 'application/json')
        raise "HTTP error #{response.status}" unless response.status == 201
        value
      rescue
        tries ||= 0
        (tries += 1) < 10 ? retry : raise
      end