aioweb_tls

TLS-fingerprinting backends for aioweb. One session class — TLSSession — takes an injected backend that swaps the HTTP client (and thus the TLS/HTTP fingerprint), while inheriting every aioweb feature — header overwrites, domain rewriting, ephemeral headers, proxies, retries, previews — unchanged. The backend swaps the wire, not the session.

from aioweb_tls import TLSSession, CurlCffi, Noble   # the two bundled backends

TLSSession(backend=CurlCffi(impersonate="chrome"))
TLSSession(backend=Noble(client="chrome_133"))
TLSSession(backend=MyBackend(...))   # or one you write — see "Writing your own backend"

Install

Depends on aioweb. The TLS clients are optional extras — install the backend you want; importing the package never fails because an extra is missing.

requirements.txt:

aioweb_tls[curl] @ git+ssh://git@git.rethinkstudios.io/rethink-public/aioweb_tls.git@v0.1.0

Direct:

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"

Constructing a backend whose client isn't installed raises a clear RuntimeError naming the extra — the error fires at construction, never at import.

curl_cffi backend

from aioweb_tls import TLSSession, CurlCffi

async with TLSSession(backend=CurlCffi(impersonate="chrome"), proxies={"https": "http://..."}) as s:
    resp = await s.request_with_retries("GET", "https://tls.peet.ws/api/all")
    if resp:                          # FailureResponse is falsy
        print(resp.json()["tls"]["ja3"])

• CurlCffi(impersonate="chrome") sets the forged profile; override per call by passing impersonate= to any request method.
• curl_cffi forges JA3/JA4 + HTTP/2 fingerprints via the bundled curl-impersonate binary.

noble backend

from aioweb_tls import TLSSession, Noble

async with TLSSession(backend=Noble(client="chrome_133")) as s:
    await s.setup()                   # fetch noble's Go shared lib once (network)
    resp = await s.request_with_retries("GET", "https://tls.peet.ws/api/all")
    if resp:
        print(resp.json()["tls"]["ja3"])

• 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).

Writing your own backend (the TLSBackend protocol)

aioweb_tls ships exactly two backends — CurlCffi and Noble — plus the TLSBackend protocol for writing your own. There is no Go, remote, or other bundled backend; anything beyond curl/noble is something you implement against the protocol. TLSSession itself is backend-agnostic, so a backend you write injects exactly like the built-ins (TLSSession(backend=YourBackend(...))) and inherits every aioweb feature for free.

To add a backend, write a small object satisfying TLSBackend (see protocol.py for the authoritative contract):

member	required?	signature	purpose
create_session	required	(headers, timeout, **kwargs) -> session	build the client object TLSSession stores as self.session
raw_request	required	async (session, method, url, **kwargs) -> aioweb.Response	send one request; adapt the client's response into an aioweb.Response
is_closed	required	(session) -> bool	whether the session is closed
cookies_for_url	optional	(session, url) -> dict	cookies for preview(); defaults to {}
setup	optional	async () -> None	one-time prep (e.g. fetch a native lib); idempotent
close	optional	async (session) -> None	close the session; defaults to await session.close()

raw_request receives aioweb-shaped kwargs: the proxy is already resolved into kwargs["proxy"], headers are merged into kwargs["headers"], and a numeric timeout is wrapped in an aiohttp.ClientTimeout (unwrap .total).

Example — a backend you would write (not included)

The class below is illustrative template code you implement yourself, shown to make the protocol concrete. It is not part of aioweb_tls — there is no from aioweb_tls import GoTLSBackend. It sketches one case (talking to a local Go TLS service over HTTP) so the shape of a conformant backend is clear:

# example: a backend YOU write to drive a local Go TLS service.
# NOT shipped by aioweb_tls — this is a TLSBackend-conformance template.
from aioweb import Response
from aioweb_tls import TLSSession

class GoTLSBackend:
    """example user-written backend: drives a local Go tls-server over HTTP"""

    def __init__(self, endpoint: str):
        self.endpoint = endpoint

    def create_session(self, headers, timeout, **kwargs):
        # build/return whatever client object raw_request will use
        import aiohttp
        return aiohttp.ClientSession(headers=headers)

    async def raw_request(self, session, method, url, **kwargs) -> Response:
        # kwargs arrive aioweb-shaped: proxy in kwargs["proxy"], headers merged,
        # numeric timeout wrapped in an aiohttp.ClientTimeout (unwrap .total).
        payload = {"method": method, "url": url, "headers": kwargs.get("headers", {})}
        async with session.post(self.endpoint, json=payload) as r:
            body = await r.json()
            return Response(
                status_code=body["status"], headers=body["headers"],
                content=body["body"].encode(), url=url, reason=body.get("reason"),
            )

    def is_closed(self, session) -> bool:
        return session.closed

    async def close(self, session) -> None:
        await session.close()

# inject your backend — same shape as CurlCffi / Noble, all aioweb features inherited
async with TLSSession(backend=GoTLSBackend("http://localhost:8080")) as s:
    s.overwrite_domain("internal.local", "127.0.0.1")
    resp = await s.request_with_retries("GET", "https://internal.local/x")

Inherited features work unchanged

aioweb's overwrite/domain/ephemeral/proxy/retry/preview logic operates on plain dicts and never touches the HTTP backend — only the seams do. Every aioweb feature behaves identically on any backend:

async with TLSSession(backend=CurlCffi(impersonate="chrome")) as s:
    s.overwrite_domain("internal.local", "127.0.0.1")
    s.set_ephemeral("X-Time", lambda: str(time.time()))
    s.overwrite_inject(True)
    print(s.preview("GET", "https://internal.local/x").as_curl())   # reflects all of the above

Honesty note

TLS fingerprinting changes one layer — the TLS/HTTP fingerprint. It does not by itself defeat modern bot protection: behavioral analysis, captchas, and JS challenges are separate signals. Use this as one component, not a complete anti-bot solution.

Versioning

Tagged vX.Y.Z. Pin the tag in requirements.txt.