Web API Batch Transactions - Content-ID URI Variables Not Working

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Posted on by MaxNorth

My team is having some trouble using changeset variables in batch transactions, as described in the official MSDN documentation for Dynamics 365 Web API Batch requests. When we attempt to reference an entity that was created in a previous changeset request with a "Content-ID: 1" header and use $1 as the root of the next changeset request's target URI, it returns an error stating “Invalid URI: The format of the URI could not be determined.” Here is an example of such a request:

--batch_1

Content-Type: multipart/mixed; boundary=changeset_2

 

--changeset_2

Content-Type: application/http

Content-Transfer-Encoding: binary

Content-ID: 1

 

POST /api/data/v8.2/contacts HTTP/1.1

Content-Type: application/json

Prefer: return=representation

 

{

    "firstname": "TestFirst1",

    "lastname": "TestLast1",

    "emailaddress1": "str@ing.com",

    "gendercode": 1 

}

 

--changeset_2

Content-Type: application/http

Content-Transfer-Encoding: binary

Content-ID: 2

 

POST $1/lastname HTTP/1.1

Content-Type: application/json

Prefer: return=representation

 

{

    "value": "TestLast2"

}

--changeset_2--

 

--batch_1--

I haven't encountered anything online indicating that the format of the reference URI is incorrect, and the request works fine when it is hardcoded as "POST api/data/v8.2/contacts(<entity guid>)/lastname HTTP/1.1"

Strangely enough, I haven't encountered any examples online of anyone using this feature against CRM. Is it supported, or is the MSDN documentation incorrect?

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This is quite an old post but I have run into a similar issue with batch requests.

It fails when using Content-ID's along with Prefer: return=representation with the message:

Content-ID Reference: '$1' does not exist in the batch context

It works perfectly if I remove Prefer: return=representation - however I need this to get ID/lookup fields back.

I haven't been able to find any documentation regarding the two.

Does anyone know of a solution?

EG

--dwa_batch_86262503-77f0-41f6-8a69-3412c4c73e1f

Content-Type: multipart/mixed;boundary=changeset_6b0e18cc-bae8-4365-8348-1d4cc2dcc068

--changeset_6b0e18cc-bae8-4365-8348-1d4cc2dcc068

Content-Type: application/http

Content-Transfer-Encoding: binary

Content-ID: 1

PATCH https://.dynamics.com/api/data/v9.2/entity1 HTTP/1.1

Content-Type: application/json

Prefer: return=representation

{"data" : "here"}

--changeset_6b0e18cc-bae8-4365-8348-1d4cc2dcc068

Content-Type: application/http

Content-Transfer-Encoding: binary

Content-ID: 100001

PATCH https://.dynamics.com/api/data/v9.2/entity2 HTTP/1.1

Content-Type: application/json

{"data" : "here"}

--changeset_6b0e18cc-bae8-4365-8348-1d4cc2dcc068--

--dwa_batch_86262503-77f0-41f6-8a69-3412c4c73e1f--

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Vipin J 1,603 on at

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Refer here - https://vjcity.blogspot.com/2020/08/batch-request-in-dynamic-365-crm-web-api.html

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