TODO

# TODO

* Use sendfile(2) to deliver cached files.
  Requires either a hyper overhaul, since the behavior of sendfile(2) does not
  work with the trait Body used everywhere, or writing the HTTP server by hand.

* Use mmap(2) to read from files.
  Requires usage of unsafe code (memmap2::Mmap::mmap()) and a rework of the
  current body type, since we would not return bytes::Bytes but borrowd slices
  of u8.

* ipnet parser updates:
  - https://github.com/krisprice/ipnet/issues/32
  - https://github.com/rust-lang/rust/pull/83652/files


* cache whether a mirror is https only and avoid initial http request?
* proxy without caching on quota hit?
* auto upgrade connections to https if supported by upstream repository?
* verify checksums of downloaded files (on, off, lazy)
* add option to limit archs (default: Dpkg::Arch::get_valid_arches())
* cache package list files and prefetch them every 30min?
* add option to import packages locally
* add integration test
* add throttling based on server loadavg?
* RFC2612 requires bailout for HTTP/1.1 if no Host
* test encoded newlines in URL

# Utils

curl --fail -o /dev/null --proxy 127.0.0.1:3142 http://deb.debian.org/debian/pool/main/f/firefox-esr/firefox-esr_115.9.1esr-1_amd64.deb

curl -i -L --http1.1 -H "user-agent: apt-cacher-rs/0.1.0" -H "host: apt.llvm.org" -H "if-modified-since: Mon, 12 Dec 2024 18:26:22 GMT" -H "cache-control: max-age=300" http://apt.llvm.org/unstable/dists/llvm-toolchain/InRelease