From 4c8e5bea0b5f4698bb4cdcb5bb4200fe4d423192 Mon Sep 17 00:00:00 2001
From: Viktor Barzin <vbarzin@gmail.com>
Date: Thu, 16 Apr 2026 22:18:51 +0000
Subject: [PATCH] [traefik] Add global compress middleware to fix response
 compression
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Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit

The rewrite-body plugin (rybbit analytics, anti-AI trap links) requires
strip-accept-encoding to work, which killed HTTP compression for 50+
services. This adds Traefik's built-in compress middleware at the
websecure entrypoint level to re-compress responses to clients after
rewrite-body has modified them.

Uses includedContentTypes whitelist (not excludedContentTypes) so only
text-based types are compressed. SSE, WebSocket, gRPC, and binary
downloads are unaffected.

Measured improvement on ha-sofia:
- app.js: 540KB → 167KB (3.2x)
- core.js: 52KB → 19KB (2.7x)

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>
---
 stacks/traefik/modules/traefik/main.tf       |  5 +-
 stacks/traefik/modules/traefik/middleware.tf | 50 ++++++++++++++++++++
 2 files changed, 54 insertions(+), 1 deletion(-)

diff --git a/stacks/traefik/modules/traefik/main.tf b/stacks/traefik/modules/traefik/main.tf
index 5b09a859..8c1b00bc 100644
--- a/stacks/traefik/modules/traefik/main.tf
+++ b/stacks/traefik/modules/traefik/main.tf
@@ -33,7 +33,7 @@ resource "helm_release" "traefik" {
 
   values = [yamlencode({
     deployment = {
-      replicas = 3
+      replicas                      = 3
       terminationGracePeriodSeconds = 60
       lifecycle = {
         preStop = {
@@ -123,6 +123,9 @@ resource "helm_release" "traefik" {
           tls = {
             enabled = true
           }
+          middlewares = [
+            "traefik-compress@kubernetescrd",
+          ]
         }
         http3 = {
           enabled        = true
diff --git a/stacks/traefik/modules/traefik/middleware.tf b/stacks/traefik/modules/traefik/middleware.tf
index a31c00a3..4326298c 100644
--- a/stacks/traefik/modules/traefik/middleware.tf
+++ b/stacks/traefik/modules/traefik/middleware.tf
@@ -277,6 +277,56 @@ resource "kubernetes_manifest" "middleware_strip_accept_encoding" {
   depends_on = [helm_release.traefik]
 }
 
+# Re-compress responses to clients after rewrite-body plugin has modified them.
+# Applied at websecure entrypoint level (outermost), so the response path is:
+# backend → rewrite-body modifies uncompressed HTML → compress gzips → client.
+# Uses includedContentTypes (whitelist) instead of excludedContentTypes:
+# - Only compresses text-based types that benefit from compression
+# - Binary types (images, video, zip) are never compressed (no wasted CPU)
+# - SSE (text/event-stream) is not listed = not compressed (safe for streaming)
+# - WebSocket is safe regardless (Hijacker interface bypasses compress)
+# - gRPC is hardcoded excluded in Traefik source (always safe)
+resource "kubernetes_manifest" "middleware_compress" {
+  manifest = {
+    apiVersion = "traefik.io/v1alpha1"
+    kind       = "Middleware"
+    metadata = {
+      name      = "compress"
+      namespace = kubernetes_namespace.traefik.metadata[0].name
+    }
+    spec = {
+      compress = {
+        minResponseBodyBytes = 1024
+        includedContentTypes = [
+          "text/html",
+          "text/css",
+          "text/plain",
+          "text/xml",
+          "text/javascript",
+          "application/javascript",
+          "application/json",
+          "application/xml",
+          "application/xhtml+xml",
+          "application/rss+xml",
+          "application/atom+xml",
+          "image/svg+xml",
+          "application/wasm",
+          "font/woff2",
+          "font/woff",
+          "font/ttf",
+          "application/manifest+json",
+        ]
+      }
+    }
+  }
+
+  field_manager {
+    force_conflicts = true
+  }
+
+  depends_on = [helm_release.traefik]
+}
+
 # ForwardAuth middleware to block known AI bot User-Agents
 resource "kubernetes_manifest" "middleware_ai_bot_block" {
   manifest = {