[OASIS Issue Tracker] (ODATA-716) Upsert does not work with OptimisticConcurrency

[OASIS Issues Tracker <workgroup_mailer@lists.oasis-open.org>]

     [ https://issues.oasis-open.org/browse/ODATA-716?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Ralf Handl updated ODATA-716:
-----------------------------

    Environment: [Proposed][Applied]  (was: [Proposed])

> Upsert does not work with OptimisticConcurrency
> -----------------------------------------------
>
>                 Key: ODATA-716
>                 URL: https://issues.oasis-open.org/browse/ODATA-716
>             Project: OASIS Open Data Protocol (OData) TC
>          Issue Type: Bug
>          Components: OData Protocol 
>    Affects Versions: V4.0_OS
>         Environment: [Proposed][Applied]
>            Reporter: Ralf Handl
>             Fix For: V4.0_ERRATA01
>
>
> Upsert allows constructing a resource path and providing a desired after-image. If the request is executed successfully, the identified entity will exist and look somewhat similar to the desired after-image.
> Unfortunately this does not combine with optimistic concurrency.
> If an operation on an entity requires an ETag, then services MUST refuse requests without an If-Match header.
> If the client doesn't know (or care) whether the entity already exists, it cannot produce a valid If-Match header, because even the wildcard * does not work: HTTP defines that if the field-value is "*", the condition is false if the origin server does not have a current representation for the target resource, i.e. it is false if the entity does not yet exist.
> I don't see a way to make upsert work in combination with ETags. 



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