# File lib/rack/etag.rb, line 10 10: def call(env) 11: status, headers, body = @app.call(env) 12: 13: if !headers.has_key?('ETag') 14: digest, body = digest_body(body) 15: headers['ETag'] = %("#{digest}") 16: end 17: 18: [status, headers, body] 19: end