Sharepoint _API/$batch response is not in JSON format

[Rishabh-Gupta]

Like, If I'm trying to call the Batch API
https://xyz.sharepoint.com/sites/abc/_api/$batch

I'm getting response in the text format But I want it to be a JSON

--batchresponse_cdd522a4-cf21-4c48-8b5b-808574047560

Content-Type: application/http

Content-Transfer-Encoding: binary

HTTP/1.1 400 Bad Request

CONTENT-TYPE: application/json;odata=verbose;charset=utf-8

{"error":{"code":"-1, Microsoft.SharePoint.Client.InvalidClientQueryException","message":{"lang":"en-US","value":"The property '_test_' does not exist on type 'SP.Data.TDCE136ListItem'. Make sure to only use property names that are defined by the type."}}}

--batchresponse_cdd522a4-cf21-4c48-8b5b-808574047560--

[#2]

@Rishabh-Gupta Try passing accept and content-type headers like below with REST API request: 

var jsonSPHeaders = {  
    "Accept": "application/json;odata=verbose", 
    "Content-Type": "application/json;odata=verbose"
}

1. Basic batched GET requests using REST API 
2. SharePoint Online : Performing Batch Operations using REST API 

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[#3]

Hi, But I'm using multipart/mixed headers as well
self.headers["Content-Type"] = f'multipart/mixed; boundary="batch_{batch_guid}"'