[OLINGO-1060] Unable to retrieve a referenced metadata document referenced by Microsoft dynamics metadata document

• Type: Question
• Status: Resolved
• Priority: Major
• Resolution: Information Provided
• Affects Version/s: (Java) V4 4.3.0
• Component/s: odata4-client
• Assignee: Ramesh Reddy
• Reporter: Sumit
• Created: 13/Dec/16 10:17
• Updated: 17/Apr/17 13:39
• Resolved: 17/Apr/17 13:39

Description

Below is a sample metadata document as given by a microsoft dynamics instance

<?xml version="1.0" encoding="utf-8"?>
<edmx:Edmx Version="4.0" xmlns:edmx="http://docs.oasis-open.org/odata/ns/edmx">
    <edmx:Reference Uri="http://vocabularies.odata.org/OData.Community.Keys.V1.xml">
        <edmx:Include Namespace="OData.Community.Keys.V1" Alias="Keys" />
        <edmx:IncludeAnnotations TermNamespace="OData.Community.Keys.V1" />
    </edmx:Reference>
    <edmx:Reference Uri="http://vocabularies.odata.org/OData.Community.Display.V1.xml">
        <edmx:Include Namespace="OData.Community.Display.V1" Alias="Display" />
        <edmx:IncludeAnnotations TermNamespace="OData.Community.Display.V1" />
    </edmx:Reference>
    <edmx:DataServices>
        <Schema Namespace="Microsoft.Dynamics.CRM" Alias="mscrm" xmlns="http://docs.oasis-open.org/odata/ns/edm">
        <!-- Not showing the detailed entity types and other details as this information is irrelevant for current issue -->
        </Schema>
    </edmx:DataServices>
</edmx:Edmx>

The referenced metadata document http://vocabularies.odata.org/OData.Community.Keys.V1.xml has 'Content-Type' header set to "text/xml" in response. But olingo's AbstractMetadataRequestImpl[0] sets 'Accept' header to "application/xml" in the request for fetching the metadata document. As a result we get 406 response code (since the accept header does not contain the type as specified in the respone.

Should "text/html" be added to Accept header of metadata request ? (I have tried and tested this solution)

[0] - https://github.com/apache/olingo-odata4/blob/8515b48dd5e09e4597d0b396326bd6a074efa1f5/lib/client-core/src/main/java/org/apache/olingo/client/core/communication/request/retrieve/AbstractMetadataRequestImpl.java#L32