Does Composite API Support Chatter Posts?

Question

Is there an official documentation which shows what list of rest api does composite api supports?

I tried this composite api request body.

POST_URL : {{_endpoint}}/services/data/v59.0/composite

{
    "allOrNone": true,
    "compositeRequest": [
        {
            "method": "PATCH",
            "url": "/services/data/v59.0/sobjects/Case/500al00000Ht0vH",
            "referenceId": "caseUpdate",
            "body": {
                "Status": "Working"
            }
        },
        {
            "method": "POST",
            "url": "/services/data/v59.0/chatter/feed-elements",
            "referenceId": "newFeedElement",
            "body": {
                "body": {
                    "messageSegments": [
                        {
                            "type": "Text",
                            "text": "When should we meet for planning?"
                        }
                    ]
                },
                "feedElementType": "FeedItem",
                "subjectId": "500al00000Ht0vH" // Your valid Case ID
            }
        }
    ]
}

But seems like /services/data/v59.0/chatter/feed-elements is not supported via composite apis.

I get in response.

{
    "compositeResponse": [
        {
            "body": [
                {
                    "errorCode": "PROCESSING_HALTED",
                    "message": "The transaction was rolled back since another operation in the same transaction failed."
                }
            ],
            "httpHeaders": {},
            "httpStatusCode": 400,
            "referenceId": "caseUpdate"
        },
        {
            "body": [
                {
                    "errorCode": "NOT_FOUND",
                    "message": "The requested resource does not exist"
                }
            ],
            "httpHeaders": {},
            "httpStatusCode": 404,
            "referenceId": "newFeedElement"
        }
    ]
}   

If I try to fire {{_endpoint}}/services/data/v59.0/chatter/feed-elements separately, it works fine and adds chatter posts on case.

Answer

The Composite API in Salesforce allows multiple API requests in a single HTTP request but supports only specific resources. These include all sObject resources, the Query and QueryAll resources, and the sObject Collections resource. The /services/data/vXX.X/chatter/feed-elements endpoint for Chatter posts is not supported within Composite API requests, even though it works as a standalone request. Below is an example illustrating this limitation, followed by explanations of the code snippets.

Composite API Request Example:

POST {{_endpoint}}/services/data/v59.0/composite
{
    "allOrNone": true,
    "compositeRequest": [
        {
            "method": "PATCH",
            "url": "/services/data/v59.0/sobjects/Case/500al00000Ht0vH",
            "referenceId": "caseUpdate",
            "body": {
                "Status": "Working"
            }
        },
        {
            "method": "POST",
            "url": "/services/data/v59.0/chatter/feed-elements",
            "referenceId": "newFeedElement",
            "body": {
                "body": {
                    "messageSegments": [
                        {
                            "type": "Text",
                            "text": "When should we meet for planning?"
                        }
                    ]
                },
                "feedElementType": "FeedItem",
                "subjectId": "500al00000Ht0vH"
            }
        }
    ]
}

Code Explanation:
The request sets allOrNone to true to ensure that either all operations succeed or none are committed. The first composite request updates the status of a specific Case record using the PATCH method. The second composite request attempts to post a Chatter feed element to the Case using the /chatter/feed-elements endpoint. However, this fails because the Composite API does not support Chatter resources.

Composite API Response:

{
    "compositeResponse": [
        {
            "body": [
                {
                    "errorCode": "PROCESSING_HALTED",
                    "message": "The transaction was rolled back since another operation in the same transaction failed."
                }
            ],
            "httpHeaders": {},
            "httpStatusCode": 400,
            "referenceId": "caseUpdate"
        },
        {
            "body": [
                {
                    "errorCode": "NOT_FOUND",
                    "message": "The requested resource does not exist"
                }
            ],
            "httpHeaders": {},
            "httpStatusCode": 404,
            "referenceId": "newFeedElement"
        }
    ]
}

Code Explanation:
The PROCESSING_HALTED error occurs because one operation in the transaction failed, causing the rollback of all changes. The first request (caseUpdate) succeeds, but the second request (newFeedElement) results in a 404 NOT_FOUND error. This indicates that the Composite API does not recognize the /chatter/feed-elements resource. While the Chatter endpoint works as a standalone call, it cannot be processed within a composite request.

Summing up

The Composite API in Salesforce supports specific REST API resources, such as sObject operations, Query, QueryAll, and sObject Collections. However, Chatter API endpoints like /services/data/vXX.X/chatter/feed-elements are not supported in composite requests. While these endpoints function as standalone API calls, attempting to include them in a Composite API request results in errors, such as NOT_FOUND. This limitation is confirmed by Salesforce’s official documentation, which specifies the resources supported by the Composite API.

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