@NonNull
    public static Single<Response> postRequest(final String uri, final Parameters params) {
        return request("POST", uri, params, null, null);
    }
POST HTTP request

@param uri    the URI to request
@param params the parameters to add to the POST request
@return a Single with the HTTP response, or an IOException
main/src/main/java/cgeo/geocaching/network/Network.java