Transformation and Routing in TYK

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I just tested the following VP endpoint:

function myAttempt(request, session, config) {
    newRequest = {
        "Method": "POST",
        "Body": request.Body,
        "Domain": "https://httpbin.org/post",
    };

    response = TykMakeHttpRequest(JSON.stringify(newRequest));
    usableResponse = JSON.parse(response);

    var responseObject = {
        Body: usableResponse.Body,
        Code: usableResponse.Code,
        Headers: {}
    }

    for (var k in usableResponse.Headers) {
        if (usableResponse.Headers.hasOwnProperty(k)) {
            responseObject.Headers[k] = usableResponse.Headers[k][0]
        }
    }

    return TykJsResponse(responseObject, {})
}

With the following command:

curl -X POST https://<dashboard>/myapi -H "Content-Type: application/json" --data "{\"Status\":\"Ok\"}"

And httpbin returns the following:

{
  "args": {}, 
  "data": "{\"Status\":\"Ok\"}", 
  "files": {}, 
  "form": {}, 
  "headers": {
    "Accept": "*/*", 
    "Accept-Encoding": "gzip", 
    "Auth-Sig": "Signature keyId=\"asd\",algorithm=\"hmac-sha256\",headers=\"(request-target) accept x-real-ip x-scheme content-length content-type user-agent x-forwarded-for x-forwarded-port x-forwarded-proto connection authorization date\",signature=\"I7L8J1M0W325ku0U4iQ%2BoJEhFPWr7YY6A4uFMihvwts%3D\"", 
    "Authorization": "Signature", 
    "Content-Length": "15", 
    "Content-Type": "application/json", 
    "Date": "Tue, 11 Feb 2020 13:45:37 UTC", 
    "Host": "httpbin.org", 
    "User-Agent": "curl/7.54.0", 
    "X-Amzn-Trace-Id": "Root=1-5e42b001-b3bbd1ba7e8612a4f2b1955a", 
    "X-Scheme": "https"
  }, 
  "json": {
    "Status": "Ok"
  }, 
  "method": "POST", 
  "origin": "93.185.27.194, 93.185.27.194, 18.223.195.89, 172.31.25.233, 13.59.220.123", 
  "url": "http://httpbin.org/anything"
}

However if i do not send Content-Type header, it gets interpreted as a string.
So maybe this is the same issue you have: try adding content-type header set to application/json.