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\b When reading, certain files might need to be fetched in background (or updated) and this process needs to be triggered somehow
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\b Network latency and speed are not relevant, e.g. accessing apt-cacher-ng via localhost connection (with the current implementation, this is very important
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\b The proxy service can work efficiently with many requests for small data ranges (apt-cacher-ng, for example)
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\b Pattern matching on paths is sufficient to distinguish file and directory names
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Typical use may be to let apt/dpkg use package file like they are present on the local filesystem so there is no need to download them.
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In sources.list, the source appears as a file:/ type URL, like: