Replace GZIP compression with Brotli

Cargo.toml

@@ -23,5 +23,5 @@ tokio = { version = "1.11", default-features = false, features = ["rt-multi-thre
 tower-http = { version = "0.3", features = ["compression-full", "fs", "set-header", "trace"] }
 tower = "0.4"
 fastrand = "1.5"
-flate2 = "1.0"
+brotli = { version = "3", default-features = false, features = ["std"]}
 rcgen = { version = "0.9", default-features = false }

src/server.rs

@@ -1,10 +1,10 @@
 use std::net::SocketAddr;
 
-use axum::headers::{ContentEncoding, HeaderName};
+use axum::headers::HeaderName;
 use axum::http::{HeaderValue, StatusCode};
 use axum::response::{Html, IntoResponse, Response};
 use axum::routing::{get, get_service};
-use axum::{Router, TypedHeader};
+use axum::Router;
 use axum_server::tls_rustls::RustlsConfig;
 use axum_server_dual_protocol::ServerExt;
 use tower::ServiceBuilder;
@@ -47,7 +47,7 @@ pub async fn run_server(options: Options, output: WasmBindgenOutput) -> Result<(
     let serve_dir = get_service(ServeDir::new(".")).handle_error(internal_server_error);
 
     let serve_wasm = || async move {
-        (TypedHeader(ContentEncoding::gzip()), WithContentType("application/wasm", compressed_wasm))
+        ([("content-encoding", "br")], WithContentType("application/wasm", compressed_wasm))
     };
 
     let app = Router::new()

src/wasm_bindgen.rs

@@ -3,8 +3,6 @@ use anyhow::Context;
 use std::path::Path;
 use tracing::debug;
 
-const COMPRESSION_LEVEL: u32 = 2;
-
 pub struct WasmBindgenOutput {
     pub js: String,
     pub compressed_wasm: Vec<u8>,
@@ -34,15 +32,11 @@ pub fn generate(wasm_file: &Path) -> Result<WasmBindgenOutput> {
     Ok(WasmBindgenOutput { js, compressed_wasm })
 }
 
-fn compress(bytes: &[u8]) -> Result<Vec<u8>, std::io::Error> {
-    use flate2::write::GzEncoder;
-    use flate2::Compression;
-    use std::io::prelude::*;
-
-    let mut encoder = GzEncoder::new(Vec::new(), Compression::new(COMPRESSION_LEVEL));
+fn compress(mut bytes: &[u8]) -> Result<Vec<u8>, std::io::Error> {
+    use brotli::enc::{self, BrotliEncoderParams};
 
-    encoder.write_all(bytes)?;
-    let compressed = encoder.finish()?;
+    let mut output = Vec::new();
+    enc::BrotliCompress(&mut bytes, &mut output, &BrotliEncoderParams::default())?;
 
-    Ok(compressed)
+    Ok(output)
 }