cli: ValueError: Elements in iterable body must be bytestrings

Hello! Thank you for such a great tool!

I’m experiencing with an error trying to send request to API server. It seems the request is OK, but there is a problem with response - HTTPie can’t parse it. Here is an example:

~$ http --print hbHB POST 'https://cloud.roistat.com/api/v1/project/analytics/data?project=48526&key=XXX' dimensions:='["marker_level_1"]' period:='{"from": "2020-10-01","to": "2020-11-01"}' metrics:='["visits"]'
POST /api/v1/project/analytics/data?project=48526&key=XXX HTTP/1.1
Accept: application/json, */*;q=0.5
Accept-Encoding: gzip, deflate
Connection: keep-alive
Content-Length: 111
Content-Type: application/json
Host: cloud.roistat.com
User-Agent: HTTPie/2.3.0

{
    "dimensions": [
        "marker_level_1"
    ],
    "metrics": [
        "visits"
    ],
    "period": {
        "from": "2020-10-01",
        "to": "2020-11-01"
    }
}

http: error: ValueError: Elements in iterable body must be bytestrings. Illegal element: {

I’ve emulated request to API server using CURL, and the response is:

$ curl -i -X POST -H "Content-Type: application/json" -d @json.json 'https://cloud.roistat.com/api/v1/project/analytics/data?project=48526&key=XXX'
HTTP/1.1 200 OK
Server: nginx/1.8.0
Date: Fri, 20 Nov 2020 07:12:08 GMT
Content-Type: application/json; charset=utf-8
Transfer-Encoding: chunked
Connection: keep-alive
Vary: Accept-Encoding
Access-Control-Allow-Credentials: true
Access-Control-Allow-Origin: *
Cache-Control: no-cache, must-revalidate
Vary: Accept-Encoding
X-Powered-By: PHP/7.1.33-16+0~20200514.38+debian9~1.gbp1e5820

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So it seems the problem in HTTPie. Is it possible to handle with it?