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James Tucker
6608b9a387
Adds tsweb/compserve: content negotiation for precompressed static variants, with a transcode-to-identity fallback for clients that do not accept an encoding (including when the raw file is absent), and CompressWriter, which live-compresses dynamic responses with zstd in its fastest mode, streamed incrementally with no buffering. Negotiation is q-value and wildcard aware (gzip;q=0 previously matched gzip). client/web serves its prebuilt embedded assets through compserve, replacing brotli with zstd; the embedded FS is wrapped in tsweb/vcstime for conditional-request mod times. tsweb/compserve/gzip.go keeps transitional serving of gzip variants from pre-zstd file systems (such as the currently published web-client-prebuilt module): passthrough to gzip-accepting clients, transcoded to identity otherwise; it becomes inert once a zstd-only module is published. util/zstdframe gains pooled GetDecoder and GetStreamingEncoder (concurrency=1). util/precompress is now a build-time tool, generating zstd variants only. cmd/tsconnect and cmd/build-webclient consume the new precompress/compserve split. tsweb.AcceptsEncoding and tsweb/tswebutil are removed; negotiation lives in compserve and the deprecated shim had no callers. go.mod bumps web-client-prebuilt. Also fixes a transcoding bug where http.ServeContent's size probe via the promoted zstd.Decoder.WriteTo could report a zero length, serving empty bodies. Updates tailscale/corp#20099 Signed-off-by: James Tucker <james@tailscale.com>