docs: narrow the per-call impersonate= claim (v0.1.2)

per-call impersonate= is honored only via the low-level request()/_raw_request path
(which forwards **kwargs to the backend), NOT request_with_retries — its inherited
aioweb signature is fixed with no **kwargs and raises TypeError on an extra kwarg.
docs-only across README + backend docstring + CLAUDE.md; for the retrying path, set
the profile on the CurlCffi/Noble instance. no code change.

Signed-off-by: disqualifier <dev@disqualifier.me>

README.md

@@ -22,17 +22,17 @@ you want; importing the package never fails because an extra is missing.
 `requirements.txt` (pick the extra you need):
 
 ```
-aioweb_tls[curl]  @ git+ssh://git@git.rethinkstudios.io/rethink-public/aioweb_tls.git@v0.1.0
-aioweb_tls[noble] @ git+ssh://git@git.rethinkstudios.io/rethink-public/aioweb_tls.git@v0.1.0
-aioweb_tls[all]   @ git+ssh://git@git.rethinkstudios.io/rethink-public/aioweb_tls.git@v0.1.0
+aioweb_tls[curl]  @ git+ssh://git@git.rethinkstudios.io/rethink-public/aioweb_tls.git@v0.1.2
+aioweb_tls[noble] @ git+ssh://git@git.rethinkstudios.io/rethink-public/aioweb_tls.git@v0.1.2
+aioweb_tls[all]   @ git+ssh://git@git.rethinkstudios.io/rethink-public/aioweb_tls.git@v0.1.2
 ```
 
 Direct:
 
 ```bash
-pip install "aioweb_tls[curl] @ git+ssh://git@git.rethinkstudios.io/rethink-public/aioweb_tls.git@v0.1.0"
-pip install "aioweb_tls[noble] @ git+ssh://git@git.rethinkstudios.io/rethink-public/aioweb_tls.git@v0.1.0"
-pip install "aioweb_tls[all] @ git+ssh://git@git.rethinkstudios.io/rethink-public/aioweb_tls.git@v0.1.0"
+pip install "aioweb_tls[curl] @ git+ssh://git@git.rethinkstudios.io/rethink-public/aioweb_tls.git@v0.1.2"
+pip install "aioweb_tls[noble] @ git+ssh://git@git.rethinkstudios.io/rethink-public/aioweb_tls.git@v0.1.2"
+pip install "aioweb_tls[all] @ git+ssh://git@git.rethinkstudios.io/rethink-public/aioweb_tls.git@v0.1.2"
 ```
 
 - `[curl]` → curl_cffi backend · `[noble]` → noble_tls backend · `[all]` → both.
@@ -55,8 +55,11 @@ async with TLSSession(backend=CurlCffi(impersonate="chrome"), proxies={"https":
         print(resp.json()["tls"]["ja3"])
 ```
 
-- `CurlCffi(impersonate="chrome")` sets the forged profile; override per call by
-  passing `impersonate=` to any request method.
+- `CurlCffi(impersonate="chrome")` sets the forged profile; override it per call by
+  passing `impersonate=` to the low-level `request()` (which forwards `**kwargs` to the
+  backend). `request_with_retries` has a fixed signature and does **not** accept extra
+  backend kwargs — passing `impersonate=` there raises `TypeError`; set the profile on
+  the `CurlCffi` instance for the retrying path.
 - curl_cffi forges JA3/JA4 + HTTP/2 fingerprints via the bundled curl-impersonate binary.
 
 ## noble backend
@@ -73,8 +76,8 @@ async with TLSSession(backend=Noble(client="chrome_133")) as s:
 
 - `Noble(client="chrome_133")` — accepts a `noble_tls.Client` enum or a string name.
 - noble_tls downloads a Go shared library on first use. `await s.setup()` fetches it
-  once at startup; if you skip it, the first request fetches it lazily (guarded to run
-  once).
+  once at startup; if you skip it, the first request fetches it lazily. The fetch is
+  guarded by a lock, so even concurrent first requests download it exactly once.
 
 ## Writing your own backend (the `TLSBackend` protocol)
 

pyproject.toml

@@ -4,7 +4,7 @@ build-backend = "hatchling.build"
 
 [project]
 name = "aioweb_tls"
-version = "0.1.0"
+version = "0.1.2"
 description = "TLS-fingerprinting backends for aioweb — curl_cffi / noble_tls ExtendedSession subclasses, config-free, installable."
 requires-python = ">=3.10"
 dependencies = [

src/aioweb_tls/backends.py

@@ -11,7 +11,9 @@ is not installed raises a clear RuntimeError naming the extra to install. import
 this module never fails because an extra is missing.
 """
 
+import asyncio
 import logging
+import math
 
 from aioweb import Response
 
@@ -60,7 +62,10 @@ class CurlCffi:
 
     config:
         impersonate: browser profile to forge (default "chrome"); override per call
-            by passing impersonate= to any request method.
+            by passing impersonate= to the low-level request()/_raw_request path,
+            which forwards **kwargs to the backend. NOT request_with_retries — its
+            signature is fixed (no **kwargs) and would raise TypeError. for a
+            per-call profile under retries, set it on the CurlCffi instance instead.
 
     requires the [curl] extra (pip install "aioweb_tls[curl]").
     """
@@ -103,8 +108,17 @@ class CurlCffi:
         )
 
     def is_closed(self, session) -> bool:
-        """whether the curl_cffi session is closed"""
-        return bool(getattr(session, "closed", False))
+        """whether the curl_cffi session is closed
+
+        curl_cffi tracks closed state in the private `_closed` (no public `closed`
+        property), so read that; fall back to a public `closed` if a future version
+        adds one. TLSSession's own `_closed` flag is the primary signal — this is a
+        best-effort backend check for out-of-band closes.
+        """
+        closed = getattr(session, "_closed", None)
+        if closed is None:
+            closed = getattr(session, "closed", False)
+        return bool(closed)
 
     def cookies_for_url(self, session, url) -> dict:
         """cookies curl_cffi would send for url (best-effort)"""
@@ -135,6 +149,7 @@ class Noble:
             ) from _NOBLE_ERROR
         self.client = self._resolve_client(client)
         self._updated = False
+        self._setup_lock = asyncio.Lock()
 
     @staticmethod
     def _resolve_client(client):
@@ -144,24 +159,42 @@ class Noble:
         return client
 
     async def setup(self) -> None:
-        """fetch the noble_tls Go shared library once; idempotent
+        """fetch the noble_tls Go shared library once; idempotent and concurrency-safe
 
         download_if_necessary handles the first-time fetch (no lib present);
         update_if_necessary refreshes an existing one. try download first so a
         clean environment works, falling back to update.
+
+        guarded by an asyncio.Lock with a check-lock-recheck so concurrent first
+        requests don't both run the fetch: the fast path returns once _updated is
+        set, and only the first caller through the lock does the work.
         """
         if self._updated:
             return
-        download = getattr(noble_tls, "download_if_necessary", None)
-        if download is not None:
-            await download()
-        else:
-            await noble_tls.update_if_necessary()
-        self._updated = True
+        async with self._setup_lock:
+            if self._updated:
+                return
+            download = getattr(noble_tls, "download_if_necessary", None)
+            if download is not None:
+                await download()
+            else:
+                await noble_tls.update_if_necessary()
+            self._updated = True
 
     def create_session(self, headers, timeout, **kwargs):
-        """build the noble_tls Session"""
-        return noble_tls.Session(client=self.client, **kwargs)
+        """build the noble_tls Session, honoring session-default headers + timeout
+
+        noble_tls.Session takes neither headers nor timeout in its constructor, so
+        aioweb's session-default headers (and the coerced timeout) are applied after
+        construction — matching CurlCffi, which passes both through. without this a
+        TLSSession(backend=Noble(...), headers=...) would silently drop the headers.
+        """
+        session = noble_tls.Session(client=self.client, **kwargs)
+        if headers:
+            session.headers.update(headers)
+        if timeout is not None:
+            session.timeout_seconds = timeout
+        return session
 
     async def raw_request(self, session, method, url, **kwargs) -> Response:
         """send via noble_tls and adapt the result into an aioweb.Response"""
@@ -169,7 +202,9 @@ class Noble:
 
         timeout = _coerce_timeout(kwargs.pop("timeout", None))
         if timeout is not None:
-            kwargs["timeout_seconds"] = int(timeout)
+            # noble takes whole seconds; round UP so a sub-second timeout (e.g. 0.5)
+            # doesn't truncate to 0 (which would mean no/instant timeout)
+            kwargs["timeout_seconds"] = max(1, math.ceil(timeout))
 
         proxy = kwargs.pop("proxy", None)
         if proxy: