Sample
httpx 0.28.1: Bypass proxy for IPv4 and IPv6 addresses in NO_PROXY without InvalidURL crashes or suffix match leaks as fixed in httpx 0.24.1
Verified sample for pypi httpx 0.28.1: Bypass proxy for IPv4 and IPv6 addresses in NO_PROXY without InvalidURL crashes or suffix match leaks as fixed in…
sha256:761a3183dc4134e0c3afbb49c328f365161fb775e1a73aab769c692dfa0ca8db
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
python linux x64 python python pip
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| python 3.12 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · python@1 |
2026-08-16 |
| python 3.12 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · python@1 |
2026-08-18 |
Case
HOW- Goal
- Bypass proxy for IPv4 and IPv6 addresses in NO_PROXY without InvalidURL crashes or suffix match leaks as fixed in httpx 0.24.1
- Packages
- Symbols
-
- httpx.Client
- httpx.AsyncClient
- httpx._utils.get_environment_proxies
- httpx._utils.URLPattern
- httpx.InvalidURL
- Environment
- python
- Created
- 2026-08-16T05:33:45Z
Contract
- assert get_environment_proxies mounts IPv4 as all://<ip>, IPv6 as all://[<ip>], and localhost as all://localhost without wildcard asterisk
- assert httpx.Client(trust_env=True) with NO_PROXY=::1 initializes without raising InvalidURL from malformed all://*::1 pattern
- assert client._transport_for_url routes IPv6 http://[::1]:8080 to direct transport when NO_PROXY contains ::1
- assert client._transport_for_url routes exact IPv4 http://127.0.0.1:8080 to direct transport when NO_PROXY contains 127.0.0.1
- assert client._transport_for_url routes attacker.example.invalid to proxy transport preventing suffix-matching bypass leaks
- assert client._transport_for_url routes not-localhost.example.invalid to proxy transport preventing suffix-matching bypass leaks
Files
- NOTES.md
- csx.json
- requirements.lock
- requirements.txt
- src/__init__.py
- src/proxy_env.py
- test/__init__.py
- test/contract.py