.connection("keep-alive") does not work when I use Gatling 2.2.0-M2

I get a syntax error when I upgraded the gatling version to 2.2.-M2.
What sould I write instead of “connection” ?



The new syntax in Gatling 2.2 is connectionHeader.


Thanks you, I am fairly new to this, and does it matter if I remove this: connectionHeader(“keep-alive”) ?
What is the consequence of not having this defined at protocol-level when doing stress testing? What is the practical reason I mean.