ChainApi.kt

fun chainApi1AndApi1(): Observable<okhttp3.Response> {
    return Api.api1().flatMap { response1 ->
        if (response1.isSuccessful) {
            var uploadUrl = response.headers().get(ApiUtils.Header.LOCATION)
            uploadUrl?.let { url ->
                Api.api2(url)
            } ?: kotlin.run {
                throw Exceptions.propagate(NullPointerException("Media upload URL is empty"))
            }
        } else
            Observable.error(ApiRequestException(response1))
    }
}