[teiid-issues] [JBoss JIRA] (TEIID-5545) Odata V4 Batch processing does not work as teiid/olingo rejects "Accept: multipart/mixed" request header

[Christoph John (Jira)]

    [ https://issues.jboss.org/browse/TEIID-5545?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13678099#comment-13678099 ] 

Christoph John commented on TEIID-5545:
---------------------------------------

Hello Ramesh,
very great news!!!! The Olingo update did work and OpenUI5 is now smoothly running in batch mode, at least my first tests look like this :)
I am wondering, if there might be a chance to get you interested in extending the Olingo behavior to support  the early request feature of OpenUI5 as well. Then the entire OData V4 functionality of OpenUI would be supported.
The early request feature seems to be a HEAD request which is send as soon as the model is instantiated to async cache the metadata file/ files of the service for faster loading of SPA apps. The feature is described here:

https://sapui5.hana.ondemand.com/#/api/sap.ui.model.odata.v4.ODataModel

Search in the constructor for "earlyRequests?".

What I do not know is, if this feature is part of the official OData V4 Standard, or if this is a SAP feature.

Once again, thanks for your help! Seems like I can really build an enterprise quality app with open source components alone :)

> Odata V4 Batch processing does not work as teiid/olingo rejects "Accept: multipart/mixed" request header
> --------------------------------------------------------------------------------------------------------
>
>                 Key: TEIID-5545
>                 URL: https://issues.jboss.org/browse/TEIID-5545
>             Project: Teiid
>          Issue Type: Bug
>          Components: OData
>    Affects Versions: 11.2
>            Reporter: Christoph John
>            Assignee: Ramesh Reddy
>            Priority: Critical
>             Fix For: 12.1
>
>
> When using Teiid together with SAPUI5/OpenUI5 Odata V4 model, batch processing does not work as Teiid rejects the "Accept: multipart/mixed" header. The issue has been described in
> https://developer.jboss.org/message/986421#986421
> It has been stated that Olingo in general does support multipart messages and it was recommended to remove the header from the request.
> https://developer.jboss.org/message/986425#986425
>  Unfortunately this seems to be not easily possible when using the SAPUI5 framework. I addressed the issue in the SAPUI5 forum under the following issue:
> https://github.com/SAP/openui5/issues/2288
> The result of this discussion was, that the header is valid for the send content. As I am no expert in the topic I do not really have an opinion on that. However, 
> https://www.w3.org/Protocols/rfc1341/7_2_Multipart.html
> suggests that the header is required. So I am not sure if it is correct or an error to reject the message. However, if Olingo can process the content, it would be great to have a fix for the accept header, or alternatively a config option to enable handling of the Accept header in a way that Olingo processes these data.



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