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https://issues.apache.org/jira/browse/OLINGO-1332?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16821398#comment-16821398
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Michael Bolz commented on OLINGO-1332:
--------------------------------------

Hello [~jbarotin],

Sorry for the delay.
However regarding your fix in OData V4 [8.2.8.7 Preference 
return=representation and 
return=minimal|http://docs.oasis-open.org/odata/odata/v4.0/errata03/os/complete/part1-protocol/odata-v4.0-errata03-os-part1-protocol-complete.html#_Toc453752234]
 it is defined that:
{quote}
In OData, return=representation or return=minimal is defined for use with a 
POST, PUT, or PATCH Data Modification Request other than to a stream property, 
or to an Action Request. Specifying a preference of return=representation or 
return=minimal in a GET or DELETE request, or any request to a stream property, 
SHOULD return a 4xx Client Error.
{quote}

So as I understand your case you receive an error if you add {{Prefer': 
'return=minimal'}} in a {{GET}} HTTP request.
If yes then this is the behaviour as defined in OData V4.
If not please help me in explain your issue in more detail.

Kind Regards, Michael



> Header Perfer: "return=minimal" or "return=representation" return Error 
> "Prefer Header not supported"
> -----------------------------------------------------------------------------------------------------
>
>                 Key: OLINGO-1332
>                 URL: https://issues.apache.org/jira/browse/OLINGO-1332
>             Project: Olingo
>          Issue Type: Bug
>          Components: odata4-server
>    Affects Versions: (Java) V4 4.5.0
>            Reporter: Jerome BAROTIN
>            Assignee: Michael Bolz
>            Priority: Major
>             Fix For: (Java) V4 4.6.0
>
>         Attachments: OLINGO-1332.patch
>
>
>  
> Hi,
> {color:#333333}Considering the following python script  :{color}
> {code:java}
> # -*- encoding: utf-8 -*-
> import requests
> headers = {
>     'Content-Type': 'application/json',
>     'Prefer': 'return=minimal'
> }
> url = "http://localhost:8080/Customers(2)"
> r = requests.get(url, headers=headers))
> print(r.content){code}
> If I run it on my olingo implementation, I've got the following content : 
> {noformat}
> b'{"error":{"code":null,"message":"The Prefer header \'return=minimal\' is 
> not supported for this HTTP Method."}}'{noformat}
>  
>  
>  
>  
> {color:#808080} {color}



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