Independent Submission K. Meadors, Ed. Request for Comments: 6017 Drummond Group Inc. Category: Informational September 2010 ISSN: 2070-1721
Electronic Data Interchange - Internet Integration (EDIINT) Features Header Field
With the maturity of the Electronic Data Interchange - Internet Integration (EDIINT) standards of AS1, AS2, and AS3, applications and additional features are being built upon the basic secure transport functionality. These features are not necessarily supported by all EDIINT applications and could cause potential problems with implementations. The EDIINT-Features header field provides a means to resolve these problems and support new functionality.
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This document is not an Internet Standards Track specification; it is published for informational purposes.
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EDIINT applications provide for a secure means of payload document transport. The original intent was for transport of a single EDI or XML document. However, as AS1 [RFC3335], AS2 [RFC4130], and AS3 [RFC4823] matured, other features and application logic were implemented upon EDIINT standards. Since these features go beyond (but do not violate) the basic premise of EDIINT, a means is needed to communicate to trading partners features that are supported by the originating user agent. The EDIINT-Features header indicates the capability of the user agent to support the listed feature with its trading partner without out-of-band communication and agreement.
The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this document are to be interpreted as described in RFC 2119 [RFC2119].
The EDIINT-Features header field indicates the originating user agent is capable of supporting the features listed. The EDIINT-Features header field MUST be present in all messages transmitted by the user agent and not just messages that utilize the feature. Upon examination of the EDIINT-Features header field, the trading partner SHOULD assume the user agent is capable of receiving messages utilizing any of the features listed.
Features that utilize the EDIINT-Features header field MUST be specified in RFCs. These RFCs MUST describe the feature name that is listed in the header and the means by which it should be used.
AS2 and AS3 applications currently use a version header, AS2-Version and AS3-Version, respectively, to indicate functional support. The EDIINT-Features header field tremendously improves the purpose and function of the old version header. However, to provide a connection from the old version header and the EDIINT-Features header field, AS2 and AS3 applications that implement the EDIINT-Features header field MUST use the version value of "1.2" to indicate the support of the EDIINT-Features header field. Also, since version "1.1" indicates the implementation supports compression [RFC5402] and "1.2" builds upon "1.1", AS2-Version or AS3-Version of "1.2" MUST support compression regardless of whether it is mentioned as a feature in the EDIINT-Features header field.
AS1 does not use a version header and one is not required for including the EDIINT-Features header field.
The EDIINT-Features header field is informational, and AS1, AS2, or AS3 trading partners who have not implemented it can safely ignore this header.