CHANGELOG.md

@@ -5,6 +5,21 @@
 
 ## 0.34.0
 
+- DEV 1 KiB reverse-proxy throughput follow-up: identify HTTP/1.1 upstream
+  idle-pool capacity as a bottleneck using 4-vs-64 live tuning trials on the
+  *supplied, unmodified executable*. Change the new-vhost default from 4 to 64
+  (still bounded to 1..64), preserving explicit saved values and all recycle
+  settings. Keep resource/FD trade-offs documented.
+- Avoid uncontended `Mutex::lock` operations in final `Exchange::drop` via
+  exclusive `get_mut`, move final owned log strings, and skip reserved-cookie
+  sanitization when the corresponding header is absent. Preserve analytics,
+  history, counters, all security checks and cookie handling when present.
+- Add source guards, Rust regressions and a measured-configuration report in
+  `docs/PROXY_1KB_HOTPATH_DEV_0.34.0.md`. This **source** is not compiled;
+  newly introduced code performance and full protocol parity remain unverified.
+  No version increment and no claim of reaching 100k RPS / 80% nginx.
+
+
 - Follow-up HOT cache path: clone response headers outside the shared store
   mutex using immutable `Arc<HeaderMap>` metadata; preserve exact hit/LRU
   accounting and per-response Age/transform flags. Fast-path direct no-Vary

SHA256SUMS

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@@ -70,11 +72,11 @@ ec7e32fd19e6ba6ed1732f1f3dd92ac0860609e8c0bbd3c1998840cdfb24bf54  docs/SECURITY.
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@@ -159,6 +161,7 @@ e69813fb1d3a4cdcfb7243964cc323fc21a603087bf2e84188fa42b9d3cee4b5  scripts/runtim
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 d98c80663847d6d83073df074ebff65952755415574708abcc153bd8d3adfaa9  src/web_server/response.rs
+833c9fea744b9649046e1a64d6fc6972fbf6cea640e1943b0db52b7ccfa9faad  src/web_server/response/file.rs
+ba793a140699956a9aef6bc79b0c731c481af8ab7ac3d816a28695743febcb30  src/web_server/response/file_body.rs
+c2e54fd803a10f74490f183e8c030fd0e3e72f5de4e79c55bc393ab57d90ab9a  src/web_server/response/file_body/tests.rs
+20509f9302b79d3a7be76dda6edaf5711826d3ddf47d19ebe07cb289427ca328  src/web_server/response/headers.rs
 305c0109b4f869a99381a142853f9e2205f5c7c4f904b2dfa4643274bfc542af  src/web_server/routing.rs
 400e1c8aa2fe857d96036a64499fbc3de44c1e3a53811c5b25101fb843359792  src/web_server/security.rs
 54cf72a82e023fe46513b9cf3130adfef1cd96c40f790c533016b4825d542e06  src/web_server/serve.rs

docs/PROXY_1KB_HOTPATH_DEV_0.34.0.md

@@ -0,0 +1,137 @@
+# RustProxy 0.34.0 DEV: 1 KiB reverse-proxy throughput audit
+
+## Goal and evidence boundaries
+
+Priority 1 is short (~1 KiB) HTTP reverse-proxy responses: aim for approximately
+100,000 requests/s, and eventually at least 80% of nginx under the **same**
+controlled benchmark, without disabling authentication, ACLs, caching semantics,
+rate limits, traffic accounting, request IDs, logs, body streaming or protocol
+support. Priority 2 is local WWW serving, to be tuned and measured separately.
+This is a development revision; Cargo/package version remains **0.34.0**.
+
+**This source is not compiled in the current environment.** Neither `cargo`
+nor `rustc` is available. Only the user's pre-existing executable (SHA-256
+`453757748455d7b9b50a6140e322ee4d4cf4a030eea29318686f2e28c594b644`)
+was run. Live configuration A/B tests therefore substantiate a **configuration
+bottleneck**, not the throughput of this edited source.
+
+## Real baseline experiment (existing executable only)
+
+Disposable loopback nginx upstream, 1,040-byte body, HTTP/1.1 persistent
+frontend connections, caching disabled, identity response encoding, four Tokio
+workers, ApacheBench (`ab -k -n 12000`), 16/64 concurrent frontend clients.
+Checks outside the timed intervals verified HTTP 200, exact 1,040 bytes and
+SHA-256 `62a08d75cdde0416c883d72458385b5e56ae8c14466934ad784587ddb93a548b`;
+0 failed requests in the shown samples. The host has shared CPU resources;
+results vary and are not a pinned-CPU or production acceptance benchmark.
+
+| Existing executable configuration | 16 clients, RPS | 64 clients, RPS |
+|---|---:|---:|
+| max_idle_per_host = 4 | 18,226 | 17,935 |
+| max_idle_per_host = 64 | 30,906 | 24,872 |
+| Relative change (configuration only) | +69.6% | +38.7% |
+
+A separate repeat experiment at 64 clients (two runs per variant, in order)
+produced: `idle4` 14,028 / 14,834; `idle16` 22,205 / 24,711;
+`idle32` 25,580 / 29,088; `idle64` 36,521 / 33,847;
+`idle64 + recycle 250,000` 31,168 / 29,753;
+`idle32_again` 34,798 / 29,194; `idle64_again` 34,677 / 29,965;
+`idle4_again` 23,503 / 23,514 RPS. The order drift warns against
+reporting a single percentage as a robust speedup. Raising generation
+recycling from 25,000 to 250,000 did not establish any improvement; its
+original limit is retained. All shown variants reported zero HTTP failures.
+
+A preliminary nginx comparison gave ~75k/117k RPS at 16/64 clients, but later
+nginx samples were ~50k/93k on the shared host. Do not compute a definitive
+"% nginx" from these non-isolated runs. The 100k/80% goals remain **OPEN**.
+
+## Source modifications
+
+| Location | Change | Preserved behavior / caveat |
+|---|---|---|
+| `src/balance/model.rs` | New vhost default `max_idle_per_host`: **4 -> 64** | Configured values **1..64** remain validated; existing explicitly saved `4` stays `4`. Disabled keepalive, 30 s idle timeout, 25k-request and 3,600 s recycling rules are unchanged. Increased idle sockets use more file descriptors and memory. |
+| `src/admin/web/vhosts/editor.js` | Match the new `64` default when the field is absent | Existing values, limits and all editor settings remain unchanged. |
+| `src/proxy/body.rs` | At `Exchange::drop`, use exclusive `Mutex::get_mut()` rather than lock/unlock; move owned `route`, `client_ip`, `country`, `upstream_error` into final observation where possible | Exactly the same log fields, analytics sample, counters, permit lifetime, errors and websocket/H3 fields. Analytics still gets a clone when a vhost sample is queued; history still receives the original. |
+| `src/proxy/headers.rs` | Skip reserved cookie sanitization immediately if the corresponding `Cookie`/`Set-Cookie` header is absent | Full sanitization, admin-cookie separation and restoration restrictions still apply when the header is present. |
+| `src/balance/tests.rs`, `src/proxy/body/tests.rs`, `src/proxy/headers/tests.rs` | Add compatibility, completion and cookie regression assertions | These Rust tests **require** a compiler before they count as run. |
+| `scripts/tests/*hotpath*` | Update source-only guards for the new **bounded** default | Static assertions do not prove functional or runtime performance equivalence. |
+
+**Persistence note:** old vhosts may store `keepalive.max_idle_per_host=4`
+explicitly; the new code default does not rewrite them. To apply the measured
+configuration improvement before rebuilding, change that option to `64` in the
+relevant vhost and verify actual idle socket/FD usage. Where hundreds of origins
+share a host, test `16` or `32` if the FD/memory trade-off is preferable.
+
+## Bottlenecks to profile next, not silently disable
+
+1. `src/cache/dashboard.rs::Cache::record`: obtains a **shared cache-store
+   mutex on every outcome**, including `BYPASS` when cache is disabled through
+   `src/proxy/forward/cache_lookup.rs`. This may compete with HOT cache
+   operations and admin dashboard reads; profile `pthread_mutex`/futex and
+   lock hold times. Candidate: separate bounded, sharded domain/reason
+   counters from the HOT object store while preserving exact dashboard totals,
+   reason labels and reset semantics.
+2. `src/logging/format.rs::Logs::push`: per-request bounded history
+   `try_lock`, potentially causing recorded log drops under high concurrency.
+   Preserve *existing* drops/accounting, live subscribers and external sinks.
+   Candidate: worker-local bounded batches or sharded history with deterministic
+   bounded merge; validate log order, recent history, retention and drops.
+3. `src/proxy/body.rs::Exchange::drop` + `src/traffic.rs::Analytics::push`:
+   request-sized log strings, sampling queue sends, atomics and lifecycle
+   observations. Profile allocations and CPU per completed request. Candidate:
+   compact shared immutable identity fields or conditional cloning solely
+   where consumers require ownership, without removing logs or analytics.
+4. `src/proxy/forward/route_cache.rs`: request-target path copies,
+   header policy and several route/cache eligibility steps. Measure with
+   sampling `perf record -g` before extracting additional fast paths; preserve
+   query handling, canonical host, ACL, authentication, retries and WebSockets.
+5. `src/upstream/*`: profile H1 pool misses, TCP connect rate, Hyper
+   connection reuse and generation swaps. Increasing recycle thresholds or
+   changing HTTP/2/H2C modes without an isolated performance case is not
+   recommended.
+6. **Separate WWW priority:** benchmark short static objects independently;
+   existing `sendfile: auto` applies to eligible cleartext H1 objects >=64 KiB
+   and cannot accelerate 1 KiB bodies.
+
+No lock removal, tracing/log disabling, caching-policy weakening, bypass of
+security checks, or transformation of complete bodies into buffered copies is
+proposed without a test proving semantic equivalence.
+
+## Acceptance gate on a machine with Rust toolchain and isolated load generator
+
+```bash
+./dev.sh doctor
+./dev.sh check
+CARGO_INCREMENTAL=0 ./dev.sh test
+CARGO_INCREMENTAL=0 cargo build --release --locked
+python3 scripts/performance/regression.py \
+  --binary after="$(realpath target/release/rust-proxy)" \
+  --out /tmp/rustproxy034-1kb-regression
+python3 scripts/performance/lb_regression.py \
+  --binary before=/absolute/path/to/old-rust-proxy \
+  --binary after="$(realpath target/release/rust-proxy)" \
+  --out /tmp/rustproxy034-1kb-lb
+python3 scripts/performance/transport_regression.py \
+  --binary before=/absolute/path/to/old-rust-proxy \
+  --binary after="$(realpath target/release/rust-proxy)" \
+  --out /tmp/rustproxy034-1kb-transport
+python3 scripts/performance/benchmark.py \
+  --binary before=/absolute/path/to/old-rust-proxy \
+  --binary after="$(realpath target/release/rust-proxy)" \
+  --nginx /usr/sbin/nginx --wrk /absolute/path/to/wrk \
+  --out /tmp/rustproxy034-1kb-benchmark \
+  --modes proxy --sizes small --concurrency 16,64,128 \
+  --duration 30 --warmup 5 --repeats 7
+```
+
+Use the **same explicit** `max_idle_per_host=64` and all other vhost settings
+for the *source A/B* test. Run 4 vs 64 as a separate *configuration A/B* test;
+never attribute a settings difference to code. Verify full content checksums,
+HTTP 2xx/4xx/5xx, p50/p95/p99, drop counters, backend connections,
+FD/RSS trends, CPU/request and packet/TCP retransmit rates. Test H1/H2/H3,
+TLS, WebSockets, sticky/rate/ACL, cache MISS/HIT/BYPASS, admin sessions, active
+failover, cancellation, idle timeouts and a sustained memory/connection soak.
+Profile the freshly **built** executable separately from timed RPS runs.
+
+Until compilation and those gates pass, this is a **development source-only
+candidate**, not a claim of reaching 100k RPS or 80% nginx.

docs/PROXY_RPS_0.34.0.md

@@ -18,11 +18,12 @@ passes compile, unit tests, live regressions and paired performance comparisons.
 | Log history | Move completed `LogEntry` directly into bounded history when there are no live viewers or enabled external sinks, instead of deeply cloning its strings. Continue cloning and delivering to live viewers/sinks when enabled. | Same JSON fields, history size, drop counters, file/Loki/Logstash forwarding. |
 | Route/HTTP instrumentation | Remove redundant route-ID mutex/write in forwarding and collapse H1/H2 version tallying into one branch. | Route is recorded once before forwarding; H1/H2 counters remain. |
 
-These changes build on the previous 0.34.0 route-Arc, single-backend LB,
+These historical changes build on the previous 0.34.0 route-Arc, single-backend LB,
 conditional retry/fallback-header cloning, atomic exchange flags and cache HOT
-LRU changes. There are no new UI toggles. Pool defaults remain `max_idle_per_host`
+LRU changes. There are no new UI toggles. This **earlier** revision retained `max_idle_per_host`
-4 and `pool_recycle_requests` 25,000; tune these only in separately labelled
+4 and `pool_recycle_requests` 25,000. The **subsequent DEV 1 KiB revision**
-trials. `sendfile: auto` remains opt-in and applies only to eligible Linux
+changes only the default idle limit to 64, based on live configuration A/B
+with the old binary (not source A/B); see `docs/PROXY_1KB_HOTPATH_DEV_0.34.0.md`. `sendfile: auto` remains opt-in and applies only to eligible Linux
 plaintext H1 static WWW responses, not reverse proxy or TLS/H2/H3.
 
 ## Cache transform/query policy

docs/TEST_REPORT_0.34.0.md

@@ -9,6 +9,34 @@ compiled**, the new Rust tests were **not executed**, and no 0.34.0 RustProxy
 binary or live throughput figures are supplied. Source inspection and simulated
 UI/cache tests do not close the runtime acceptance gate.
 
+## DEV 1 KiB reverse-proxy follow-up (October 2026; source only)
+
+The supplied **old executable** passed loopback HTTP/1.1 1,040-byte content
+checks and ApacheBench 12,000-request samples. The configuration trial
+`max_idle_per_host=4 -> 64` increased short-run RPS, but shared-CPU noise
+precludes a stable nginx-parity percentage. The edited sources now use 64 by
+default for absent/new keepalive fields and reduce exclusive-Drop mutex/clone
+and absent-cookie overhead. See `docs/PROXY_1KB_HOTPATH_DEV_0.34.0.md`.
+**No newly modified binary was built or run.** Rust unit tests, runtime
+regressions, long soaks and post-edit code A/B are still required.
+
+Current DEV source checks performed on the modified tree:
+
+| Check | Result | Scope |
+|---|---|---|
+| `./dev.sh doctor` | PASS | Source preflight; reports `cargo` and `rustc` absent |
+| `scripts/tests/rps_hotpath_034_static_test.py` | PASS | Guardrails, defaults, retained routing/security and source-size limits only |
+| `scripts/tests/proxy_hotpath_034_static_test.py` | PASS | Routing and telemetry source guards only |
+| `scripts/tests/cache_scope_034_static_test.py`, `cache_hot_034_static_test.py`, `sendfile_034_static_test.py` | PASS | Cache and WWW source guards only |
+| `scripts/tests/dashboard_presets_sql_test.py` | PASS | SQLite migrations and preset constraints |
+| `scripts/tests/upgrade_performance_test.py` | PASS | Disposable upgrade/preservation/locking test |
+| `scripts/tests/sendfile_034_panel_browser_test.py` | PASS, 2 widths | Simulated Chromium admin API, not live Rust |
+| `scripts/tests/vhost_backend_popup_0337_browser_test.py` | PASS, 4 widths | Simulated Chromium admin API, not live Rust |
+| Node `--check` (vhost editor), Python `compileall`, JSON parser (OpenAPI) | PASS | Syntax only |
+| `./dev.sh check`, `./dev.sh test` | BLOCKED, exit 127 | Rust toolchain missing; no Rust unit/build acceptance |
+| Old supplied binary, `ab`/nginx configuration A/B | COMPLETED, DIAGNOSTIC | 1,040-byte H1 payload; shared-CPU and no new code exercised |
+
+
 ## Later 0.34.0 reverse-proxy optimization revision
 
 The refreshed source archive additionally reuses immutable route handles,

docs/TRANSPORT.md

@@ -182,7 +182,7 @@ Downstream H2 idle retirement is activity-aware: RustProxy tracks transport I/O
 | Backend response-header deadline | 120 seconds, including upload until headers |
 | HTTP body idle timeout | 60 seconds |
 | WebSocket idle timeout / upgrade completion | 300 seconds / 10 seconds |
-| Idle pooled upstream connections | 4 per backend origin, 30-second idle timeout |
+| Idle pooled upstream connections | up to 64 per backend origin by default for new vhosts (1..64 configurable), 30-second idle timeout; existing explicit values preserved |
 | Configuration writers / log-viewer streams | 8 / 8 |
 
 CLI serve flags expose connection/in-flight counts and HTTP body, WebSocket idle,

docs/VHOSTS.md

@@ -228,12 +228,14 @@ origin do not expose a selected backend or stale origin timing.
 |---|---|---|
 | `enabled` | true | Boolean |
 | `idle_timeout_seconds` | 30 | 1..3600 |
-| `max_idle_per_host` | 4 | 1..64 |
+| `max_idle_per_host` | 64 | 1..64 |
 | `tcp_keepalive_seconds` | 30 | 1..3600 |
 | `pool_recycle_requests` | 25000 | 0 (off) or 1000..10000000 |
 | `pool_recycle_seconds` | 3600 | 0 (off) or 60..604800 |
 | `http1_max_buffer_bytes` | 131072 | 8192..1048576 |
 
+The new default of 64 applies when this field is absent in a newly created or deserialized vhost; existing saved values (including 4) remain unchanged. Each idle upstream connection consumes a file descriptor and memory, so use a smaller value for resource-constrained deployments with many origins. See `docs/PROXY_1KB_HOTPATH_DEV_0.34.0.md` for the live configuration A/B evidence.
+
 These configure HTTP idle reuse and TCP keepalive; HTTP/2 also uses pings for active
 connections, with a 10-second ping timeout and no pinging solely to keep idle
 connections alive. `pool_recycle_requests` and `pool_recycle_seconds` bound the lifetime

scripts/performance/README.md

@@ -6,6 +6,15 @@ controllable test **upstream**, used to verify streaming, non-replayable writes,
 headers, cache policy and WebSocket frames. Performance measurements use nginx
 as the shared upstream instead of Python.
 
+## DEV 1 KiB follow-up on 0.34.0 (newer source)
+
+See `docs/PROXY_1KB_HOTPATH_DEV_0.34.0.md`. The previous executable's 4-vs-64
+idle-connection tuning experiment is real loopback evidence, but the *edited*
+source has not been compiled. Its new default is 64 for new vhosts, whereas
+explicitly saved `4` remains `4`. Keep the idle limit equal between before/after
+*code* benchmarks; measure configuration tuning in a separate labelled series.
+The source release is not eligible for a claim of 100k RPS or 80% nginx yet.
+
 ## Reverse-proxy optimization revision 0.34.0
 
 After compiling the refreshed candidate, measure the same unmodified 0.33.8

scripts/tests/proxy_hotpath_034_static_test.py

@@ -42,6 +42,6 @@ for path in (ROOT / "src").rglob("*.rs"):
         continue
     assert len(path.read_text().splitlines()) <= 500, path
 assert 'version = "0.34.0"' in src("Cargo.toml")
-assert "max_idle_per_host: 4" in src("src/balance/model.rs")
+assert "max_idle_per_host: 64" in src("src/balance/model.rs")
 assert "pool_recycle_requests: 25_000" in src("src/balance/model.rs")
-print("PASS 0.34.0 proxy hot-path source wiring, observability, preserved defaults and source-size limits (STATIC ONLY)")
+print("PASS 0.34.0 proxy hot-path wiring, observability, bounded tuned defaults and source-size limits (STATIC ONLY)")

scripts/tests/rps_hotpath_034_static_test.py

@@ -5,6 +5,7 @@ These guards reject accidental removal of important branch/safety conditions.
 They must be paired with ``cargo test`` and live black-box HTTP acceptance.
 """
 from pathlib import Path
+import json
 
 ROOT = Path(__file__).resolve().parents[2]
 
@@ -88,8 +89,22 @@ assert "upstream_uri(&backend, &origin_suffix)" in route
 assert "headers::strip_hop_by_hop" in route
 assert "pool.select_wait(context.client_ip" in route or ".select_wait(context.client_ip" in route
 assert "pool.select_member_wait(id)" in route
-assert "max_idle_per_host: 4" in source("src/balance/model.rs")
+assert "max_idle_per_host: 64" in source("src/balance/model.rs")
 assert "pool_recycle_requests: 25_000" in source("src/balance/model.rs")
+assert "(1..=64).contains(&k.max_idle_per_host)" in source("src/balance/model.rs")
+assert "keepalive.max_idle_per_host ?? 64" in source("src/admin/web/vhosts/editor.js")
+openapi = json.loads(source("src/admin/openapi.json"))
+api_keepalive = openapi["components"]["schemas"]
+assert any(isinstance(schema, dict) and "keepalive" in schema.get("properties", {})
+           and schema["properties"]["keepalive"].get("properties", {})
+               .get("max_idle_per_host", {}).get("default") == 64
+           for schema in api_keepalive.values())
+assert "| `max_idle_per_host` | 64 | 1..64 |" in source("docs/VHOSTS.md")
+assert '"keepalive": { "max_idle_per_host": 4 }' in source("src/balance/tests.rs")
+assert "self.route.get_mut()" in source("src/proxy/body.rs")
+assert "let client_ip = self" in source("src/proxy/body.rs")
+assert "if !headers.contains_key(http::header::COOKIE)" in source("src/proxy/headers.rs")
+assert "if !headers.contains_key(http::header::SET_COOKIE)" in source("src/proxy/headers.rs")
 assert 'version = "0.34.0"' in source("Cargo.toml")
 
 for file in (ROOT / "src").rglob("*.rs"):

src/admin/openapi.json

@@ -4193,7 +4193,7 @@
                 "type": "integer",
                 "minimum": 1,
                 "maximum": 64,
-                "default": 4
+                "default": 64
               },
               "tcp_keepalive_seconds": {
                 "type": "integer",

src/admin/web/vhosts/editor.js

@@ -195,7 +195,7 @@ function load(value = defaults(), migrationIds = [], show = true) {
   note(g, "vhRetryHelp");
   field(g, "keepalive", "vhKeepalive", keepalive.enabled !== false, "checkbox");
   field(g, "idle-timeout", "vhIdleTimeout", keepalive.idle_timeout_seconds ?? 30, "number", { required: true, min: 1, max: 3600 });
-  field(g, "max-idle", "vhMaxIdle", keepalive.max_idle_per_host ?? 4, "number", { required: true, min: 1, max: 64 });
+  field(g, "max-idle", "vhMaxIdle", keepalive.max_idle_per_host ?? 64, "number", { required: true, min: 1, max: 64 });
   field(g, "tcp-keepalive", "vhTcpKeepalive", keepalive.tcp_keepalive_seconds ?? 30, "number", { required: true, min: 1, max: 3600 });
   field(g, "pool-recycle-requests", "vhPoolRecycleRequests", keepalive.pool_recycle_requests ?? 25000, "number", { required: true, min: 0, max: 10000000 });
   field(g, "pool-recycle-seconds", "vhPoolRecycleSeconds", keepalive.pool_recycle_seconds ?? 3600, "number", { required: true, min: 0, max: 604800 });

src/balance/model.rs

@@ -70,7 +70,10 @@ impl Default for Keepalive {
         Self {
             enabled: true,
             idle_timeout_seconds: 30,
-            max_idle_per_host: 4,
+            // Retain enough reusable H1 upstream sockets under concurrent
+            // small-response traffic. The existing 1..=64 bound, idle
+            // timeout and pool recycling still limit resource retention.
+            max_idle_per_host: 64,
             tcp_keepalive_seconds: 30,
             pool_recycle_requests: 25_000,
             pool_recycle_seconds: 3_600,

src/balance/tests.rs

@@ -102,6 +102,11 @@ mod tests {
         assert!(parsed.retry.retry_connect_errors);
         assert!(parsed.retry.retry_timeouts);
         assert_eq!(parsed.retry.retry_statuses, vec![502, 503, 504]);
+        assert_eq!(parsed.keepalive.max_idle_per_host, 64);
+        let explicit: Settings = serde_json::from_value(serde_json::json!({
+            "keepalive": { "max_idle_per_host": 4 }
+        })).unwrap();
+        assert_eq!(explicit.keepalive.max_idle_per_host, 4);
         assert_eq!(parsed.keepalive.pool_recycle_requests, 25_000);
         assert_eq!(parsed.keepalive.pool_recycle_seconds, 3_600);
         assert_eq!(parsed.keepalive.http1_max_buffer_bytes, 131_072);

src/proxy/body.rs

@@ -176,30 +176,28 @@ impl Drop for Exchange {
             _ => &self.metrics.status_5xx,
         }
         .fetch_add(1, Ordering::Relaxed);
+        // Final Arc drop has exclusive access: move strings without locking.
         let backend = self
             .backend
-            .lock()
+            .get_mut()
             .unwrap_or_else(|e| e.into_inner())
             .as_ref()
             .map(|l| l.member.backend.id.clone());
-        let websocket_phase = *self
+        let websocket_phase = *self.websocket_phase.get_mut().unwrap_or_else(|e| e.into_inner());
-            .websocket_phase
+        let route = self.route.get_mut().unwrap_or_else(|e| e.into_inner()).take();
-            .lock()
-            .unwrap_or_else(|e| e.into_inner());
-        let route = self.route.lock().unwrap_or_else(|e| e.into_inner()).clone();
         let source = ExchangeSource::name(self.source.load(Ordering::Relaxed));
         let cache_effective_enabled = read_effective(self.cache_effective_enabled.load(Ordering::Relaxed));
         let transform_effective_enabled = read_effective(self.transform_effective_enabled.load(Ordering::Relaxed));
         let client_ip = self
             .client_ip
-            .lock()
+            .get_mut()
             .unwrap_or_else(|e| e.into_inner())
-            .clone();
+            .take();
         let country = self
             .country
-            .lock()
+            .get_mut()
             .unwrap_or_else(|e| e.into_inner())
-            .clone();
+            .take();
         let request_bytes = self.request_bytes.load(Ordering::Relaxed);
         let response_bytes = self.response_bytes.load(Ordering::Relaxed);
         let duration_ms = duration.as_millis() as u64;
@@ -248,7 +246,7 @@ impl Drop for Exchange {
             sni: None,
             authority: None,
             matched_by: None,
-            cache_reason: *self.cache_reason.lock().unwrap_or_else(|e| e.into_inner()),
+            cache_reason: *self.cache_reason.get_mut().unwrap_or_else(|e| e.into_inner()),
             vhost: self.vhost.take(),
             route,
             cache_effective_enabled,
@@ -266,18 +264,18 @@ impl Drop for Exchange {
             websocket_phase,
             websocket_error: *self
                 .websocket_error
-                .lock()
+                .get_mut()
                 .unwrap_or_else(|e| e.into_inner()),
-            h3_reset_code: *self.h3_reset_code.lock().unwrap_or_else(|e| e.into_inner()),
+            h3_reset_code: *self.h3_reset_code.get_mut().unwrap_or_else(|e| e.into_inner()),
             upstream_status: match self.upstream_status.load(Ordering::Relaxed) {
                 0 => None,
                 value => Some(value),
             },
             upstream_error: self
                 .upstream_error
-                .lock()
+                .get_mut()
                 .unwrap_or_else(|e| e.into_inner())
-                .clone(),
+                .take(),
             client_ip,
             user_agent: self.user_agent.take(),
             country,
@@ -290,6 +288,7 @@ impl Drop for Exchange {
         });
     }
 }
+
 #[derive(Clone, Copy)]
 pub enum Direction {
     Request,

src/proxy/body/tests.rs

@@ -226,6 +226,30 @@ mod tests {
         }
     }
 
+    #[tokio::test]
+    async fn completion_moves_owned_fields_but_preserves_log_identity() {
+        let (exchange, slots) = observation().await;
+        let logs = exchange.logs.clone();
+        *exchange.route.lock().unwrap() = Some("route-1".into());
+        *exchange.client_ip.lock().unwrap() = Some("198.51.100.9".into());
+        *exchange.country.lock().unwrap() = Some("DE".into());
+        *exchange.upstream_error.lock().unwrap() = Some("upstream closed".into());
+        *exchange.cache_reason.lock().unwrap() = "cache_disabled";
+        *exchange.websocket_error.lock().unwrap() = Some("upstream_http_error");
+        *exchange.h3_reset_code.lock().unwrap() = Some("h3_general_protocol_error");
+        drop(exchange);
+        assert_eq!(slots.available_permits(), 1);
+        let entries = logs.recent();
+        assert_eq!(entries.len(), 1);
+        assert_eq!(entries[0].route.as_deref(), Some("route-1"));
+        assert_eq!(entries[0].client_ip.as_deref(), Some("198.51.100.9"));
+        assert_eq!(entries[0].country.as_deref(), Some("DE"));
+        assert_eq!(entries[0].upstream_error.as_deref(), Some("upstream closed"));
+        assert_eq!(entries[0].cache_reason, "cache_disabled");
+        assert_eq!(entries[0].websocket_error, Some("upstream_http_error"));
+        assert_eq!(entries[0].h3_reset_code, Some("h3_general_protocol_error"));
+    }
+
     #[tokio::test]
     async fn atomic_exchange_tags_keep_original_observability_fields() {
         let (exchange, slots) = observation().await;

src/proxy/headers.rs

@@ -45,6 +45,9 @@ include!("headers/tests.rs");
 /// guarded self-admin reverse-proxy path may restore only those fragments after
 /// the actual backend has been selected and verified.
 pub fn strip_admin_cookie(headers: &mut HeaderMap) -> Vec<String> {
+    if !headers.contains_key(http::header::COOKIE) {
+        return Vec::new();
+    }
     let mut retained = Vec::new();
     let mut admin = Vec::new();
     for part in headers
@@ -91,6 +94,9 @@ pub fn restore_admin_cookie(headers: &mut HeaderMap, admin: &[String]) {
 }
 /// Upstreams cannot overwrite the reserved admin cookie through this proxy listener.
 pub fn strip_admin_set_cookie(headers: &mut HeaderMap) {
+    if !headers.contains_key(http::header::SET_COOKIE) {
+        return;
+    }
     let retained: Vec<_> = headers
         .get_all(http::header::SET_COOKIE)
         .iter()

src/proxy/headers/tests.rs

@@ -19,6 +19,29 @@ mod tests {
         h.insert("connection", "keep-alive, Upgrade".parse().unwrap());
         assert!(requests_upgrade(&h));
     }
+    #[test]
+    fn absent_cookies_leave_headers_unchanged() {
+        let mut headers = HeaderMap::new();
+        headers.insert("x-pass", "yes".parse().unwrap());
+        assert!(strip_admin_cookie(&mut headers).is_empty());
+        strip_admin_set_cookie(&mut headers);
+        assert_eq!(headers.get("x-pass").unwrap(), "yes");
+        assert!(!headers.contains_key(http::header::COOKIE));
+        assert!(!headers.contains_key(http::header::SET_COOKIE));
+    }
+
+    #[test]
+    fn set_cookie_keeps_valid_unreserved_values() {
+        let mut headers = HeaderMap::new();
+        headers.append("set-cookie", "a=1; Secure".parse().unwrap());
+        headers.append("set-cookie", "rustproxy_session=secret".parse().unwrap());
+        headers.append("set-cookie", "b=2; HttpOnly".parse().unwrap());
+        strip_admin_set_cookie(&mut headers);
+        let cookies: Vec<_> = headers.get_all("set-cookie").iter()
+            .map(|value| value.to_str().unwrap()).collect();
+        assert_eq!(cookies, vec!["a=1; Secure", "b=2; HttpOnly"]);
+    }
+
     #[test]
     fn admin_cookie_can_be_restored_only_from_captured_fragment() {
         let mut h = HeaderMap::new();