I am sending POST request to some REST API. One of parameters in request body is a url address. My code is following:

var recordUrl = $dialer.getCallRecordingFullUrl();

var url = "<api url>";

var options = {
    headers: {},
    body: {
        ...
        "RECORD_URL": recordUrl
    }
};

var response = $http.post(url, options);

recordUrl has value like that

https://...b7d7c0a62

(without trailing backslash). But when I send post query this value turns to

https://...b7d7c0a62\

(with trailing backslash).

This invalidates the url address sent. How to solve this issue?