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how to add header and write-byte in retrofit

here is my code i want to move in retrofit how to define all property in retrofit it work fine but when i call api in retrofit responses say add required filed but i pass all filed

how to define this property in retrofit

conn.setRequestProperty("http.keepAlive", "false");
conn.setRequestProperty("Content-Type", "multipart/form-data;boundary=" + boundary);


here it's byte how to define in retrofit

outputStream.writeBytes(twoHyphens + boundary + lineEnd);
outputStream.writeBytes("Content-Disposition: form-data; name="json"" + lineEnd);
outputStream.writeBytes("Content-Type: text/plain;charset=UTF-8" + lineEnd);
outputStream.writeBytes("Content-Length: " + req.length() + lineEnd);
outputStream.writeBytes(lineEnd);
outputStream.writeBytes(req + lineEnd);
outputStream.writeBytes(twoHyphens + boundary + lineEnd);
outputStream.writeBytes(twoHyphens + boundary + lineEnd);


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