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perf(http): single smart compression layer — stop compressing media on /api

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The /api router added its own predicate-less CompressionLayer (routes.rs),
nested inside the global predicate-aware one in main.rs. As the inner layer it
compressed responses first, so the global predicate that skips already-
compressed media was bypassed for every /api response: video/audio/image/zip
downloads got Brotli-compressed (CPU + first-byte latency for ~0 bytes saved)
and lost their Content-Length (forced to chunked -> no client progress bar).

- Remove the redundant /api CompressionLayer; /api now flows through the
  single global layer in main.rs.
- Make that predicate smarter: compress by default so nothing shrinkable is
  missed, and skip ONLY already-compressed types. It no longer blanket-excludes
  image/*, so image/svg+xml (text, ~70% shrink) now compresses; raster formats
  are listed individually. Added the previously-missed already-compressed
  types: Office (docx/xlsx/pptx), ODF, epub, jar, apk, 7z/rar/bzip2/zstd/xz,
  woff/woff2 fonts, icons.

Net: media downloads keep Content-Length and skip pointless compression, while
text/JSON/JS/CSS/SVG/XML/ttf/otf/wasm still compress. fmt + clippy clean.

https://claude.ai/code/session_01UtfkS3nZF1vrF5jNAps6wV
This commit is contained in:
Claude
2026-06-09 14:08:27 +00:00
parent bf46c1ca10
commit 19b41af2e4
2 changed files with 60 additions and 15 deletions
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src/main.rs
+53 -8
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@@ -541,25 +541,70 @@ async fn main() -> Result<(), Box<dyn std::error::Error>> {
app = app.layer(DefaultBodyLimit::max(BODY_LIMIT));
// ── HTTP compression (gzip + Brotli) ─────────────────────────────────
// Negotiates the best encoding via Accept-Encoding. Skips responses
// that are already compressed or wouldn't benefit (images, video, etc.).
// Compatible with a future reverse proxy — if the proxy sees
// `Content-Encoding` it will pass the response through untouched.
// Negotiates the best encoding via Accept-Encoding. Policy: compress
// everything by default so no shrinkable response is ever missed (text,
// JSON, JS/CSS, XML, SVG, fonts ttf/otf, WASM…), and skip ONLY content
// that is already compressed — where a second pass burns CPU and adds
// latency for ~0 bytes saved.
//
// We deliberately do NOT blanket-exclude `image/*`: `image/svg+xml` is
// plain text and compresses ~70%, so the genuinely-compressed raster
// formats are listed individually instead, leaving SVG compressible.
//
// This is the single, global compression layer (the `/api` router used to
// add its own predicate-less one, which silently compressed media). It is
// reverse-proxy friendly: a proxy that sees `Content-Encoding` passes
// the response through untouched.
{
use tower_http::compression::CompressionLayer;
use tower_http::compression::predicate::{NotForContentType, Predicate, SizeAbove};
let predicate = SizeAbove::new(256)
.and(NotForContentType::GRPC)
.and(NotForContentType::IMAGES)
.and(NotForContentType::SSE)
.and(NotForContentType::const_new("application/octet-stream"))
// ── already-compressed raster images (SVG intentionally absent) ──
.and(NotForContentType::const_new("image/jpeg"))
.and(NotForContentType::const_new("image/png"))
.and(NotForContentType::const_new("image/gif"))
.and(NotForContentType::const_new("image/webp"))
.and(NotForContentType::const_new("image/avif"))
.and(NotForContentType::const_new("image/heic"))
.and(NotForContentType::const_new("image/heif"))
.and(NotForContentType::const_new("image/jp2"))
.and(NotForContentType::const_new("image/x-icon"))
.and(NotForContentType::const_new("image/vnd.microsoft.icon"))
// ── audio / video families (already compressed) ──
.and(NotForContentType::const_new("video/"))
.and(NotForContentType::const_new("audio/"))
// ── already-compressed web fonts; ttf/otf left compressible ──
.and(NotForContentType::const_new("font/woff"))
.and(NotForContentType::const_new("application/font-woff"))
// ── archives & compressed containers ──
.and(NotForContentType::const_new("application/zip"))
.and(NotForContentType::const_new("application/gzip"))
.and(NotForContentType::const_new("application/x-gzip"))
.and(NotForContentType::const_new("application/x-tar"))
.and(NotForContentType::const_new("application/x-7z-compressed"))
.and(NotForContentType::const_new("application/x-rar-compressed"))
.and(NotForContentType::const_new("application/x-bzip2"))
.and(NotForContentType::const_new("application/zstd"))
.and(NotForContentType::const_new("application/x-xz"))
// ── zip-based document / app bundles (docx/xlsx/pptx, odf, epub…) ──
.and(NotForContentType::const_new(
"application/vnd.openxmlformats-officedocument",
))
.and(NotForContentType::const_new(
"application/vnd.oasis.opendocument",
))
.and(NotForContentType::const_new("application/epub+zip"))
.and(NotForContentType::const_new("application/java-archive"))
.and(NotForContentType::const_new(
"application/vnd.android.package-archive",
))
// ── PDF: streams are usually already deflated; often large ──
.and(NotForContentType::const_new("application/pdf"))
.and(NotForContentType::const_new("video/"))
.and(NotForContentType::const_new("audio/"));
// ── opaque binary we couldn't identify ──
.and(NotForContentType::const_new("application/octet-stream"));
app = app.layer(CompressionLayer::new().compress_when(predicate));
}