I am debugging a session of streaming of Facebook Live and I have an url of .m4v type which source is https://video-mad1-1.xx.fbcdn.net. With other connection in other place I have this url: https://video.fagp1-1.fna.fbcdn.net.
why do I have different urls for the same content?
It could be depend of the connection or the place (the distance between the two places are around 2 kilometers)?
Content distribution networks (CDNs) distribute servers all over, to help serve content as close to the user as possible. This reduces latency, generally increases throughput, and cuts down on traffic load going over longer haul links that tend to be more restricted in the bandwidth they have available.
When you put content up to a CDN node, it's generally distributed to at least some other places. Therefore, it's entirely possible to have different URLs to the same content.
You might also find this interesting: https://anuragbhatia.com/2018/03/networking/isp-column/mapping-facebooks-fna-cdn-nodes-across-the-world/