Http.post not accepting content type application/query+json.

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I am using flutter application to talk with azure cosmos db. cosmos db has a sql query based rest api. Where the content type should be application/query+json.
I tried connecting to cosmos db using postman it worked but in flutter i am getting an exception as
~~~
Bad state: Cannot set the body fields of a Request with content-type "application/query+json"
~~~
So my question is does the package support content type application/query+json for the body. If yes how should i formulate my request body. My example http.post query is as below.
~~~
{
"query" : "",
"parameters" : []
}
~~~

Start by reproducing the Http.post request with content type application/query+json and the sample Cosmos DB query body, then inspect how the package handles body fields for non-form content types. Confirm the expected request behavior against the working Postman example; done means the supported behavior or required request formulation is documented and covered by a regression test.

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