rustdoc-json: Output is is zstd compressed twice.

[aDotInTheVoid]

The new rustdoc json enpoints (https://docs.rs/about/rustdoc-json) return files that need to be decompressed twice before getting the json:

alona@Ashtabula:~/tmp/docsrszstd$ curl --location  https://docs.rs/crate/clap/latest/json -o ./docs-rs-output
  % Total    % Received % Xferd  Average Speed   Time    Time     Time  Current
                                 Dload  Upload   Total   Spent    Left  Speed
  0     0    0     0    0     0      0      0 --:--:-- --:--:-- --:--:--     0
100 68106  100 68106    0     0   241k      0 --:--:-- --:--:-- --:--:--  241k
alona@Ashtabula:~/tmp/docsrszstd$ file ./docs-rs-output
./docs-rs-output: Zstandard compressed data (v0.8+), Dictionary ID: None
alona@Ashtabula:~/tmp/docsrszstd$ unzstd ./docs-rs-output -o decompressed-once
./docs-rs-output    : 68097 bytes
alona@Ashtabula:~/tmp/docsrszstd$ file ./decompressed-once
./decompressed-once: Zstandard compressed data (v0.8+), Dictionary ID: None
alona@Ashtabula:~/tmp/docsrszstd$ unzstd ./decompressed-once -o decompressed-twice
./decompressed-once : 422580 bytes
alona@Ashtabula:~/tmp/docsrszstd$ file ./decompressed-twice
./decompressed-twice: JSON text data
alona@Ashtabula:~/tmp/docsrszstd$ du -sh * | sort -h
68K     decompressed-once
68K     docs-rs-output
416K    decompressed-twice

This doesn't save any space, but makes using this more cumbersome and slower.

The files served from docs.rs should be the json compressed once, not twice.

[syphar]

oh damn, very valid bug report, I also know why.

Thanks!