TS 29.504 V20.1.0 updates its conditional GET citation to RFC 9110

Clause 6.1.2.2.7 concerns requests by a network function (NF) service consumer towards the Unified Data Repository (UDR). The Internet Engineering Task Force (IETF) citation in the new version reads "IETF RFC 9110 [15] clause 13.1.3". The corresponding text in V20.0.0 cites "IETF RFC 7232 [15] clause 3.3". Reference number [15] appears in both versions, even as the RFC number and cited clause change.

Sources: 3GPP TS 29.504 V20.1.0, clause 6.1.2.2.7. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/29_series/29.504/29504-k10.zip 3GPP TS 29.504 V20.0.0, clause 6.1.2.2.7. © 3GPP Organizational Partners (ARIB, ATIS, CCSA, ETSI, TSDSI, TTA, TTC). Official text: https://www.3gpp.org/ftp/Specs/archive/29_series/29.504/29504-k00.zip

The clause is headed If-Modified-Since in both specification versions. In both, the consumer may issue a conditional GET by including that header in Hypertext Transfer Protocol (HTTP) requests. The cited sentence continues to direct those requests towards the UDR. Our reading: This is a citation update, not a change to the consumer's stated option or request destination.