The direct video CDN links returned by this interface require the returned tt_chain_token to be accessed, otherwise HTTP 403 will be returned.
When accessing a direct video CDN link, carry Cookie: tt_chain_token={tt_chain_token} in the request header, where {tt_chain_token} is the value returned by this interface.
If a direct video CDN link still returns HTTP 403:
1.
Use the video link starting with https://www.tiktok.com/aweme/v1/play/ from the response instead (found in the UrlList fields under video)
2.
Send that link without any Cookie - carrying tt_chain_token will cause HTTP 403
If you need watermark-free video links that require no Cookie at all, use /fetch_post_detail or the interfaces under the TikTok APP V3 directory.