tls-client-python 1.14.1

High-performance Python binding for bogdanfinn/tls-client via CFFI – zero-copy, panic-proof, full TLS fingerprint control

tls-client-python

High-performance Python binding for bogdanfinn/tls-client via CFFI.

Zero-copy FFI boundary, panic-proof, full TLS fingerprint control — with a familiar requests-style API.

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What is TLS Fingerprinting?

Some people think it is enough to change the user-agent header of a request to let the server think that the client requesting a resource is a specific browser. Nowadays this is not enough, because the server might use a technique to detect the client browser which is called TLS Fingerprinting.

For a deep dive, see this excellent article on TLS fingerprinting.

✨ Features

Category	Details
🔐 TLS Fingerprinting	Impersonate Chrome, Firefox, Safari, Brave, Opera, OkHttp & more
🌐 Protocol Support	HTTP/1.1, HTTP/2 (h2), HTTP/3 (QUIC) with automatic negotiation
⚡ Protocol Racing	Chrome-style Happy Eyeballs for HTTP/2 vs HTTP/3
📋 Header Ordering	Control the exact order of HTTP headers per request
🔒 Certificate Pinning	Pin server certificates for enhanced security
🍪 Cookie Jar	Built-in cookie handling with customisable jar
🚇 Proxy Support	HTTP and SOCKS5 proxies with CONNECT auth
🔀 Redirect Control	Choose whether to follow redirects per request
📊 Bandwidth Tracking	Monitor upload/download bytes in real time
🧵 Async Support	AsyncSession for asyncio integration
🛡️ Panic-proof	All Go panics caught and surfaced as Python exceptions
⚙️ Custom TLS	Full 26-field custom TLS client configuration

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📦 Installation

pip install tls-client-python

Pre-compiled binaries are included for 9 platforms — no Go toolchain required.

Requirements

• Python 3.6+

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🚀 Quick Start

from tls_client import Session

# Create a session with Chrome 146 fingerprint
session = Session(client_identifier="chrome_146")

# GET request
resp = session.get("https://tls.browserleaks.com/json")
print(resp.status_code)   # 200
print(resp.text)           # JSON body
print(resp.used_protocol)  # "HTTP/2.0"

# POST with JSON
resp = session.post(
    "https://tls.browserleaks.com/json",
    body=b'{"hello":"world"}',
    headers={"Content-Type": "application/json"}
)
data = resp.json()
print(data["json"])  # {"hello": "world"}

Context Manager

with Session(client_identifier="safari_ios_18_5") as s:
    resp = s.get("https://tls.browserleaks.com/json")
    print(resp.status_code)

Async Usage

import asyncio
from tls_client import AsyncSession

async def main():
    async with AsyncSession(client_identifier="firefox_148") as s:
        resp = await s.get("https://tls.browserleaks.com/json")
        print(resp.json())

asyncio.run(main())

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🖥️ Supported Platforms

Pre-compiled native libraries are bundled for these platforms:

OS	Architecture	Binary
Windows	x86-64	tls-client-windows-amd64.dll
Windows	x86 (32-bit)	tls-client-windows-386.dll
macOS	x86-64	tls-client-darwin-amd64.dylib
macOS	ARM64 (Apple Silicon)	tls-client-darwin-arm64.dylib
Linux	x86-64 (glibc)	tls-client-linux-amd64.so
Linux	x86 (32-bit, glibc)	tls-client-linux-386.so
Linux	ARM64	tls-client-linux-arm64.so
Linux	ARMv7	tls-client-linux-arm.so
Alpine Linux	x86-64 (musl)	tls-client-alpine-amd64.so

The correct binary is automatically selected at runtime. Override via TLS_CLIENT_LIB environment variable.

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🎭 Supported Browser Profiles — 79 Identifiers

Set client_identifier in Session() to impersonate any of these browsers. Inspect the full list at runtime:

from tls_client import list_client_identifiers, SUPPORTED_CLIENT_IDENTIFIERS

print(len(list_client_identifiers()))        # 79
for browser, ids in SUPPORTED_CLIENT_IDENTIFIERS.items():
    print(f"{browser}: {len(ids)} profiles")

🌐 Chrome — 24 Profiles

Identifier	Notes
chrome_103 — chrome_112	Chrome Stable 103–112
chrome_116_PSK	Chrome 116 with PSK key exchange
chrome_116_PSK_PQ	Chrome 116 with PSK + Post-Quantum
chrome_117	Chrome 117
chrome_120	Chrome 120
chrome_124	Chrome 124
chrome_130_PSK	Chrome 130 with PSK
chrome_131 · chrome_131_PSK	Chrome 131 (standard & PSK)
chrome_133 · chrome_133_PSK	Chrome 133 (standard & PSK)
chrome_144 · chrome_144_PSK	Chrome 144 (standard & PSK)
chrome_146 · chrome_146_PSK	Chrome 146 — default (standard & PSK)

🦊 Firefox — 16 Profiles

Identifier	Notes
firefox_102 · firefox_104 · firefox_105 · firefox_106	Firefox 102–106
firefox_108 · firefox_110	Firefox 108 · 110
firefox_117 · firefox_120 · firefox_123	Firefox 117–123
firefox_132 · firefox_133 · firefox_135	Firefox 132–135
firefox_146_PSK	Firefox 146 with PSK
firefox_147 · firefox_147_PSK	Firefox 147 (standard & PSK)
firefox_148	Firefox 148

🍏 Safari — 10 Profiles

Identifier	Device
safari_15_6_1	Safari 15.6.1 (macOS)
safari_16_0	Safari 16.0 (macOS)
safari_ipad_15_6	Safari 15.6 (iPadOS)
safari_ios_15_5 · safari_ios_15_6	Safari iOS 15.5–15.6
safari_ios_16_0 · safari_ios_17_0	Safari iOS 16 · 17
safari_ios_18_0 · safari_ios_18_5	Safari iOS 18 · 18.5
safari_ios_26_0	Safari iOS 26

🦁 Brave — 2 Profiles

Identifier	Notes
brave_146	Brave Browser 146
brave_146_PSK	Brave 146 with PSK

🎭 Opera — 3 Profiles

Identifier
opera_89 · opera_90 · opera_91

🤖 OkHttp (Android) — 7 Profiles

Identifier
okhttp4_android_7 — okhttp4_android_13

📱 Mobile / App SDKs — 16 Profiles

Category	Identifiers
Zalando	zalando_android_mobile · zalando_ios_mobile
Nike	nike_ios_mobile · nike_android_mobile
MMS	mms_ios · mms_ios_1 · mms_ios_2 · mms_ios_3
Mesh	mesh_ios · mesh_ios_1 · mesh_ios_2 · mesh_android · mesh_android_1 · mesh_android_2
Confirmed	confirmed_ios · confirmed_android

☁️ Cloudflare-specific — 1 Profile

Identifier	Notes
cloudscraper	Custom profile tuned for Cloudflare-protected sites

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🔧 Advanced Usage

Custom TLS Client (Full Control)

Set custom_tls_client with up to 26 fields to bypass client_identifier entirely:

session = Session(custom_tls_client={
    "ja3_string": "771,4865-4866-4867-49195-49199-49196-49200-52393-52392-49171-49172-156-157-47-53,0-23-65281-10-11-35-16-5-13-18-51-45-43-27-17513,29-23-24,0",
    "h2_settings": {"HEADER_TABLE_SIZE": 65536, "MAX_CONCURRENT_STREAMS": 1000},
    "h2_settings_order": ["HEADER_TABLE_SIZE", "MAX_CONCURRENT_STREAMS"],
    "pseudo_header_order": [":method", ":authority", ":scheme", ":path"],
    "connection_flow": 1048576,
    "key_share_curves": ["X25519", "P256"],
    "alpn_protocols": ["h2", "http/1.1"],
    "supported_versions": ["1.3", "1.2"],
    "stream_id": 3,
})

Certificate Pinning

session = Session(
    certificate_pinning_hosts={
        "example.com": ["sha256/AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA="]
    }
)

Client Certificates (mTLS)

session = Session(
    client_certificates=[{
        "cert_pem": open("client.crt", "rb").read(),
        "key_pem": open("client.key", "rb").read(),
    }]
)

Stream Response to Disk

resp = session.stream_to_file(
    "GET", "https://tls.browserleaks.com/",
    output_path="/tmp/image.png"
)
print(resp.status_code)  # response metadata still available

Per-Request Overrides

All Session constructor parameters can be overridden per request:

s = Session(client_identifier="chrome_146")
# Override fingerprint for a single request
resp = s.get("https://tls.browserleaks.com/json", client_identifier="firefox_148")

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🔬 Architecture

Layer	Technology
Go Engine	bogdanfinn/tls-client compiled as C shared library (-buildmode=c-shared)
FFI Boundary	Raw C structs via CFFI — no JSON serialization overhead
Memory Safety	ffi.gc(resp, FreeResponse) — Go panics surfaced as RuntimeError
Python API	requests-style Session, Response, AsyncSession

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📚 API Reference

Session

Method	Description
get(url, **kwargs)	HTTP GET
post(url, **kwargs)	HTTP POST
put(url, **kwargs)	HTTP PUT
delete(url, **kwargs)	HTTP DELETE
head(url, **kwargs)	HTTP HEAD
patch(url, **kwargs)	HTTP PATCH
execute_request(method, url, **kwargs)	Generic request with full options
typed_request(Request)	Strongly-typed request
stream_to_file(method, url, path)	Stream response body to disk
clear_client_pool()	Close idle connections (static)

Response

Property / Method	Description
status_code	HTTP status code (int)
headers	Response headers (dict of list)
content	Raw bytes body
text	Decoded text body
encoding	Detected charset
url	Final URL after redirects
cookies	Response cookies dict
used_protocol	Protocol used (e.g. HTTP/2.0)
ok	True if status_code < 400
reason	HTTP reason phrase
json()	Parse body as JSON
raise_for_status()	Raise RuntimeError on 4xx/5xx

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🔗 Credits

This project is a Python binding for bogdanfinn/tls-client, which itself is built upon:

• Carcraftz/fhttp
• Carcraftz/utls
• refraction-networking/utls

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📄 License

MIT — see LICENSE.

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🙏 Community

Join the Discord server for support and discussion.

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