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Web streams are complex for users and implementers alike. The problems with the spec aren't bugs. They emerge from using the API exactly as designed. They aren't issues that can be fixed solely through incremental improvements. They're consequences of fundamental design choices. To improve things we need different foundations.
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Documentation on the channel endpoint: https://developers.google.com/youtube/v3/guides/implementation/channels
To give some detail, it’s /var that is writable, and mutable directories will have symbolic links pointing to subdirectories of /var: