feat: strip accept-encoding header to ensure uncompressed responses in relay

apps_script/Code.gs

@@ -26,6 +26,10 @@ const SKIP_HEADERS = {
   "x-forwarded-port": 1, "x-real-ip": 1, "forwarded": 1, "via": 1,
   // Internal relay hop-count header — must not be forwarded to target sites.
   "x-mhr-hop": 1,
+  // UrlFetchApp does not decompress gzip/br/deflate responses — stripping
+  // accept-encoding forces targets to reply with plain (uncompressed) bodies
+  // so the relay never has to handle compressed content it cannot decode.
+  "accept-encoding": 1,
 };
 
 // Pattern that matches any Google Apps Script execution endpoint.

apps_script/cloudflare_worker.js

@@ -19,6 +19,9 @@ const STRIP_HEADERS = new Set([
   "via",
   // Internal relay hop header — must not propagate to the final target.
   "x-mhr-hop",
+  // Workers cannot decompress gzip/br/deflate — stripping accept-encoding
+  // forces targets to reply with plain bodies the Worker can forward as-is.
+  "accept-encoding",
 ]);
 
 function decodeBase64ToBytes(input) {

apps_script/vps_exit_node.py

@@ -77,6 +77,9 @@ _STRIP_HEADERS = frozenset(
         "x-real-ip",
         "forwarded",
         "via",
+        # urllib.request cannot decompress gzip/br/deflate — stripping this
+        # forces targets to reply with plain bodies the server can forward.
+        "accept-encoding",
     ]
 )