3.1. Update Section 1 - Introduction

3.1. Update Section 1 - Introduction

To indicate and explain why delayed delivery of all kinds of PKIMessages may be handled at transfer level and/or at CMP level, the introduction of [RFC6712] is updated.

Replace the third paragraph of this section with the following text:

In addition to reliable transport, CMP requires connection and error handling from the transfer protocol, which is all covered by HTTP. Additionally, delayed delivery of CMP response messages may be handled at transfer level, regardless of the message contents. Since this document extends the polling mechanism specified in the second version of CMP [RFC4210] to cover all types of PKI management transactions, delays detected at application level may also be handled within CMP, using pollReq and pollRep messages.