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fix(server): add zstd HTTP compression with gzip fallback #27935

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fix(server): add zstd HTTP compression with gzip fallback #27935

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10 changes: 8 additions & 2 deletions packages/opencode/src/server/routes/instance/httpapi/middleware/compression.ts
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Original file line number Diff line number Diff line change
Expand Up @@ -13,11 +13,12 @@ const STREAMING_POST_REGEX = /^\/session\/[^/]+\/(?:message|prompt_async)$/

const THRESHOLD_BYTES = 1024

type Encoding = "gzip" | "deflate"
type Encoding = "zstd" | "gzip" | "deflate"

function pickEncoding(acceptEncoding: string | undefined): Encoding | undefined {
if (!acceptEncoding) return undefined
const lower = acceptEncoding.toLowerCase()
if (lower.includes("zstd")) return "zstd"
if (lower.includes("gzip")) return "gzip"
if (lower.includes("deflate")) return "deflate"
return undefined
Expand Down Expand Up @@ -54,7 +55,12 @@ export const compressionLayer = HttpRouter.middleware<{ handles: unknown }>()((e
const encoding = pickEncoding(request.headers["accept-encoding"])
if (!encoding) return response

const compressed = encoding === "gzip" ? gzipSync(body.body) : deflateSync(body.body)
const compressed =
encoding === "zstd"
? Bun.zstdCompressSync(body.body)
: encoding === "gzip"
? gzipSync(body.body)
: deflateSync(body.body)
return HttpServerResponse.setHeader(
HttpServerResponse.setBody(response, HttpBody.uint8Array(compressed, contentType)),
"content-encoding",
Expand Down
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