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Adds support for IPv6 zone identifiers (scope IDs) in URLs, enabling correct handling of link-local IPv6 addresses such as http://[fe80::1%25eth0]:8080/. Changes: - adapters.py: Add _has_ipv6_zone_id() helper with precompiled regex (_IPV6_ZONE_ID_RE) to detect zone IDs in the URL authority section. Update _urllib3_request_context() to use urllib3's parse_url() for zone ID URLs and urlparse() for all others, preserving backward compatibility. The poolmanager parameter is kept as an optional default-None argument to avoid breaking subclass callers. - models.py: Add zone ID re-encoding logic in prepare_url() with three precompiled patterns (_AUTHORITY_BRACKET_RE, _RFC6874_ZONE_ID_RE, _RAW_ZONE_ID_RE). Reconstructs the bracketed host from the original URL to prevent parse_url's %25->% decoding from creating ambiguous percent sequences downstream (e.g. %2550 -> %50 on Python 3.14). - tests/test_adapters.py: Comprehensive test coverage including zone ID detection (38 parametrized cases), URL parsing (15 cases), and integration tests covering pool key generation, client certificates, full mocked request flow, encoding equivalence, URL preparation preservation, request_url() path extraction, and proxy code path. Fixes psf#6927, psf#6735, psf#7088. Made-with: Cursor
📝 WalkthroughWalkthroughAdds IPv6 zone‑ID detection and handling: adapters now detect zone IDs and switch parsing to urllib3.parse_url when present; PreparedRequest preserves or re-encodes zone delimiters during URL preparation; tests added to cover detection, parsing, pool key selection, proxy and cert propagation, and edge cases. Changes
Sequence DiagramsequenceDiagram
participant Client
participant PreparedRequest
participant HTTPAdapter
participant Detector
participant URLParser
participant PoolManager
Client->>PreparedRequest: prepare_url(original_url)
PreparedRequest->>HTTPAdapter: _urllib3_request_context(url)
HTTPAdapter->>Detector: _has_ipv6_zone_id(url)
Detector-->>HTTPAdapter: true/false
alt zone ID present
HTTPAdapter->>URLParser: urllib3.util.parse_url(url)
URLParser-->>HTTPAdapter: parsed.host (bracketed), port, scheme
HTTPAdapter->>HTTPAdapter: strip brackets, preserve/re-encode zone delimiter
else no zone ID
HTTPAdapter->>URLParser: urlparse(url)
URLParser-->>HTTPAdapter: hostname, port, scheme
end
HTTPAdapter-->>PreparedRequest: host_params (host, scheme, port)
PreparedRequest->>PreparedRequest: reconstruct URL with encoded zone ID
PreparedRequest->>PoolManager: build_connection_pool_key_attributes(host, port, scheme)
PoolManager-->>Client: connection pool key / connection
Estimated code review effort🎯 4 (Complex) | ⏱️ ~45 minutes Poem
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Actionable comments posted: 1
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@src/requests/adapters.py`:
- Around line 127-140: The request_url() path currently always uses
urllib.parse.urlparse (lines around request_url and its callers), causing
incorrect parsing for percent-encoded IPv6 zone IDs; update request_url() to
mirror _urllib3_request_context() by checking _has_ipv6_zone_id(request.url) and
using urllib3.util.parse_url when true (and strip brackets from
parsed_request_url.host into hostname), otherwise fall back to urlparse() as
before; ensure you reference and reuse the same variables/behavior (scheme,
port, hostname) so HTTPAdapter.send() and pool-key logic remain consistent with
_urllib3_request_context() and IPv6 zone-aware parsing is applied everywhere.
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src/requests/adapters.pysrc/requests/models.pytests/test_adapters.py
Updates the HTTPAdapter to use parse_url() for URLs with IPv6 zone IDs, ensuring proper scheme detection. This change maintains compatibility with existing URL parsing logic for non-zone ID URLs. No functional changes to proxy handling were introduced. This adjustment enhances the robustness of the adapter in handling diverse URL formats.
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Actionable comments posted: 2
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@src/requests/adapters.py`:
- Line 123: Remove the extra blank line immediately following the affected
function signature in adapters.py so the function header and its first statement
are adjacent; locate the relevant function definition (the def line for the
adapter function in this file) and delete the blank line after the signature so
the file passes ruff-format.
- Around line 117-122: The _urllib3_request_context function currently declares
a required parameter poolmanager that is unused; change its declaration to make
it optional and explicitly ignored to avoid signature churn and ARG001 by either
giving it a default None (poolmanager: "PoolManager | None" = None) or renaming
it to _poolmanager: "PoolManager | None" = None, and leave the rest of the
function unchanged so callers remain compatible and linters stop flagging the
unused parameter.
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src/requests/adapters.py
…unction This commit cleans up the code by removing an extraneous blank line in the _urllib3_request_context function within adapters.py, improving readability without altering functionality.
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♻️ Duplicate comments (1)
src/requests/adapters.py (1)
117-122: 🛠️ Refactor suggestion | 🟠 MajorKeep
poolmanageroptional if it is only a compatibility placeholder.
poolmanageris still required and still unused, so callers have to pass a value for no effect. Making it default toNone(or renaming it to_poolmanager) preserves the intended compatibility story and avoids the unused-argument churn.🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@src/requests/adapters.py` around lines 117 - 122, The parameter poolmanager in _urllib3_request_context is currently required but unused; make it optional by changing the signature to accept poolmanager: "PoolManager | None" with a default of None (or rename it to _poolmanager to indicate intentionally unused), update the return type hint if necessary, and adjust any callers that currently pass a value so they can omit the argument; ensure type annotations and any mypy/typing imports reflect the new optional type.
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@src/requests/adapters.py`:
- Around line 92-95: The regex _IPV6_ZONE_ID_RE is too restrictive for raw zone
IDs—its second alternation only matches a letter then at least two chars, so
numeric IDs like %1 or %12 fall through; update the pattern in _IPV6_ZONE_ID_RE
to allow a single alphanumeric start (including digits) and allow zero-or-more
of the subsequent allowed chars while preserving the %(?![0-9A-Fa-f]{2})
negative lookahead; e.g. replace the segment
r"|%(?![0-9A-Fa-f]{2})[a-zA-Z][a-zA-Z0-9_.\-]+" with
r"|%(?![0-9A-Fa-f]{2})[0-9A-Za-z][A-Za-z0-9_.\-]*" so numeric scope IDs like %1
and %12 are matched by the raw zone-ID branch.
---
Duplicate comments:
In `@src/requests/adapters.py`:
- Around line 117-122: The parameter poolmanager in _urllib3_request_context is
currently required but unused; make it optional by changing the signature to
accept poolmanager: "PoolManager | None" with a default of None (or rename it to
_poolmanager to indicate intentionally unused), update the return type hint if
necessary, and adjust any callers that currently pass a value so they can omit
the argument; ensure type annotations and any mypy/typing imports reflect the
new optional type.
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Fix all unresolved CodeRabbit comments on this PR:
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- Create a new PR with the fixes
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src/requests/adapters.py
This commit modifies the regular expressions used for matching raw zone IDs in both adapters.py and models.py to allow for numeric characters in the initial position. Additionally, it enhances test coverage for single-digit numeric zone indices in test_adapters.py, ensuring accurate detection and parsing of various IPv6 zone ID formats.
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Actionable comments posted: 1
♻️ Duplicate comments (2)
src/requests/adapters.py (2)
606-607:⚠️ Potential issue | 🔴 CriticalThe proxied HTTP path still falls back to stdlib URL parsing.
This branch now handles zone IDs for
scheme, but proxied HTTP requests still passrequest.urlintourldefragauth(). Ifsrc/requests/utils.py::urldefragauthis still based onurlparse(),%25...zone-ID URLs will keep failing on the proxy send path even after_has_ipv6_zone_id()succeeds here.#!/bin/bash set -e printf '%s\n' '--- request_url() proxy branch ---' sed -n '590,609p' src/requests/adapters.py printf '\n%s\n' '--- urldefragauth() implementation ---' rg -n -C3 'def urldefragauth|urlparse|urlunparse' src/requests/utils.pyExpected result:
urldefragauth()still reparses with stdliburlparse(), so the proxy branch is not yet using the same zone-ID-safe parsing strategy as_urllib3_request_context().🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@src/requests/adapters.py` around lines 606 - 607, The proxied-HTTP branch still calls urldefragauth(request.url) which uses stdlib urlparse and thus fails for %25... zone-ID IPv6 addresses; update the proxy path so it uses the same zone-ID-safe URL construction used by _urllib3_request_context() (or update urldefragauth to use that new parsing strategy) instead of urlparse-based reparsing—ensure the branch guarded by is_proxied_http_request and not using_socks_proxy builds the URL with the zone-ID-aware logic that _has_ipv6_zone_id() expects so proxied requests handle IPv6 zone IDs correctly.
117-122:⚠️ Potential issue | 🟠 MajorKeep
poolmanageroptional here, as advertised.Line 121 still makes
poolmanagerrequired even though this helper never reads it. That reintroduces the signature churn the PR summary explicitly says it avoids, and Ruff will still report the unused argument.Proposed fix
def _urllib3_request_context( request: "PreparedRequest", verify: "bool | str | None", client_cert: "tuple[str, str] | str | None", - poolmanager: "PoolManager", + poolmanager: "PoolManager | None" = None, ) -> "(dict[str, typing.Any], dict[str, typing.Any])": + _ = poolmanager host_params = {} pool_kwargs = {}🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed. In `@src/requests/adapters.py` around lines 117 - 122, The helper _urllib3_request_context currently declares poolmanager as a required parameter even though it isn't used; change its signature to make poolmanager optional with a default None (e.g. poolmanager: "PoolManager | None" = None) so the parameter is truly optional and avoids an unused-argument lint error (no other behavior changes needed).
🤖 Prompt for all review comments with AI agents
Verify each finding against the current code and only fix it if needed.
Inline comments:
In `@src/requests/models.py`:
- Around line 448-482: prepare()/prepare_cookies() fails on Python 3.14+ because
requote_uri() double-encodes %XX sequences inside a reconstructed zone ID; fix
the host-reconstruction logic in the block that uses _AUTHORITY_BRACKET_RE,
_RFC6874_ZONE_ID_RE and _RAW_ZONE_ID_RE so the zone-id part preserves existing
%XX escapes while only converting literal/raw percent delimiters to %25. In
practice, when building host (the variable used by prepare_url()/prepare()),
treat any '%' that is already followed by two hex digits as an existing
percent-encoding and leave it alone, and only replace literal '%' delimiters (or
'%' not followed by two hex digits) with '%25' (for the legacy raw % case
re-encode as %25<zone>). Ensure this reconstructed host is used before
requote_uri()/urlparse() so Python stdlib validation sees the correctly-encoded
%25 delimiter without producing double-encoded sequences.
---
Duplicate comments:
In `@src/requests/adapters.py`:
- Around line 606-607: The proxied-HTTP branch still calls
urldefragauth(request.url) which uses stdlib urlparse and thus fails for %25...
zone-ID IPv6 addresses; update the proxy path so it uses the same zone-ID-safe
URL construction used by _urllib3_request_context() (or update urldefragauth to
use that new parsing strategy) instead of urlparse-based reparsing—ensure the
branch guarded by is_proxied_http_request and not using_socks_proxy builds the
URL with the zone-ID-aware logic that _has_ipv6_zone_id() expects so proxied
requests handle IPv6 zone IDs correctly.
- Around line 117-122: The helper _urllib3_request_context currently declares
poolmanager as a required parameter even though it isn't used; change its
signature to make poolmanager optional with a default None (e.g. poolmanager:
"PoolManager | None" = None) so the parameter is truly optional and avoids an
unused-argument lint error (no other behavior changes needed).
🪄 Autofix (Beta)
Fix all unresolved CodeRabbit comments on this PR:
- Push a commit to this branch (recommended)
- Create a new PR with the fixes
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src/requests/adapters.pysrc/requests/models.pytests/test_adapters.py
Comment on lines
+448
to
+482
| # Mitigation for RFC 6874: parse_url incorrectly decodes zone ID delimiter (%25 -> %) | ||
| # We reconstruct the host with the correct, fully-encoded delimiter to prevent | ||
| # downstream errors (like ipaddress validation or incorrect connection arguments). | ||
| # | ||
| # Matching on the parse_url-decoded host is ambiguous because parse_url decodes | ||
| # %25 -> % and then the resulting %XX may look like a valid percent-encoding | ||
| # (e.g. %2550 becomes %50 which resembles percent-encoded 'P'). Instead we | ||
| # extract the bracket content from the ORIGINAL url (before any decoding) and | ||
| # match there. Two input forms are handled: | ||
| # | ||
| # 1. RFC 6874 encoded form (%25 delimiter): the original bracket contains %25 | ||
| # followed by one or more ZoneID unreserved chars ([A-Za-z0-9_.\-~]) or | ||
| # pct-encoded octets (%XX). Examples: [fe80::1%25eth0], [fe80::1%255], | ||
| # [fe80::1%25_foo]. The matched segment is placed verbatim into host. | ||
| # | ||
| # 2. Raw % delimiter (legacy/non-standard): a literal % that is NOT a valid | ||
| # %XX percent-encoding, followed by a letter then more identifier chars. | ||
| # Examples: [fe80::1%eth0], [fe80::1%wlan0]. Re-encoded as %25<zone_name>. | ||
| # | ||
| # This avoids false-positive re-encoding of legitimate %XX sequences (e.g. %20, | ||
| # %AB) that should never be treated as zone ID delimiters. | ||
| if host and host.startswith("[") and host.endswith("]"): | ||
| original_bracket = _AUTHORITY_BRACKET_RE.search(url) | ||
| if original_bracket: | ||
| original_inner = original_bracket.group(1) | ||
| rfc_match = _RFC6874_ZONE_ID_RE.search(original_inner) | ||
| if rfc_match: | ||
| ip_part = original_inner[: rfc_match.start()] | ||
| host = f"[{ip_part}{rfc_match.group()}]" | ||
| else: | ||
| raw_match = _RAW_ZONE_ID_RE.search(original_inner) | ||
| if raw_match: | ||
| pos = raw_match.start() | ||
| host = f"[{original_inner[:pos]}%25{original_inner[pos + 1 :]}]" | ||
|
|
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# Test if urlparse handles zone ID URLs - create a test script
python3 << 'EOF'
from urllib.parse import urlparse, urlunparse
test_urls = [
"http://[fe80::1%25eth0]/path",
"http://[fe80::1%25Ethernet%203]/path",
"http://[fe80::1%eth0]/path",
"http://[fe80::1]/path"
]
print("Testing urlparse with zone ID URLs:")
for url in test_urls:
try:
parsed = urlparse(url)
print(f"✓ {url}")
print(f" netloc: {parsed.netloc}")
except Exception as e:
print(f"✗ {url}")
print(f" error: {e}")
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# Test the actual flow: does requote_uri + urlunparse properly handle reconstructed zone IDs?
python3 << 'EOF'
from urllib.parse import urlparse, urlunparse, quote
from urllib3.util import parse_url
# Simulate what happens in prepare_url for the problematic URL
original_url = "http://[fe80::1%25Ethernet%203]:8080/path"
# Step 1: parse_url decodes it
scheme, auth, host, port, path, query, fragment = parse_url(original_url)
print(f"After parse_url (urllib3):")
print(f" host: {host}")
print(f" port: {port}")
# Step 2: Reconstruct netloc (simulating the zone ID fix)
# The zone ID fix would reconstruct host to [fe80::1%25Ethernet%203]
netloc = host
if port:
netloc += f":{port}"
print(f"\nNetloc: {netloc}")
# Step 3: Rebuild URL using urlunparse
rebuilt_url = urlunparse([scheme, netloc, path, None, query, fragment])
print(f"\nRebuilt URL (before requote_uri): {rebuilt_url}")
# Step 4: Apply requote_uri
from requests.utils import requote_uri
final_url = requote_uri(rebuilt_url)
print(f"Final URL (after requote_uri): {final_url}")
# Step 5: Will this work with urlparse when prepare_cookies calls it?
print(f"\nWill stdlib urlparse accept this?")
try:
parsed = urlparse(final_url)
print(f"✓ Yes, netloc: {parsed.netloc}")
except Exception as e:
print(f"✗ No: {e}")
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python3 << 'EOF'
import sys
print(f"Python version: {sys.version}")
print(f"Python 3.14+: {sys.version_info >= (3, 14)}")
# Check if _check_bracketed_netloc exists (Python 3.14+)
import urllib.parse
if hasattr(urllib.parse, '_check_bracketed_netloc'):
print("_check_bracketed_netloc is present (Python 3.14+ behavior)")
else:
print("_check_bracketed_netloc not found (older Python)")
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# Verify the exact re-encoding problem with requote_uri
python3 << 'EOF'
from urllib.parse import urlunparse
from requests.utils import requote_uri
# After parse_url decoded %25->%, the reconstructed host is:
host_after_reconstruction = "[fe80::1%Ethernet%203]"
netloc = f"{host_after_reconstruction}:8080"
url_before_requote = urlunparse(["http", netloc, "/path", None, None, None])
url_after_requote = requote_uri(url_before_requote)
print(f"Before requote_uri: {url_before_requote}")
print(f"After requote_uri: {url_after_requote}")
print(f"\nThe %25 in zone name becomes %25Ethernet%25203")
print(f"This confuses ipaddress.ip_address which sees 2 bare % delimiters")
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Zone ID URLs with percent-encoded characters fail on Python 3.14+ during prepare() → prepare_cookies().
The prepare_url() mitigation correctly reconstructs the zone ID host, but requote_uri() double-encodes embedded %XX sequences in the zone name (e.g., %203 becomes %25203). When prepare_cookies() calls urlparse(), Python 3.14+ validates the bracketed netloc via ipaddress.ip_address(), which splits on the first % and rejects scope IDs containing unescaped % bytes. This is documented in test_ipv6_zone_id_with_percent_encoded_name(), which conditionally expects InvalidURL exceptions on Python 3.14+ while handling it gracefully on earlier versions. The adapter path works correctly (does not use stdlib urlparse), but the full Request.prepare() flow fails for zone names like Ethernet%203 on affected Python versions.
🤖 Prompt for AI Agents
Verify each finding against the current code and only fix it if needed.
In `@src/requests/models.py` around lines 448 - 482, prepare()/prepare_cookies()
fails on Python 3.14+ because requote_uri() double-encodes %XX sequences inside
a reconstructed zone ID; fix the host-reconstruction logic in the block that
uses _AUTHORITY_BRACKET_RE, _RFC6874_ZONE_ID_RE and _RAW_ZONE_ID_RE so the
zone-id part preserves existing %XX escapes while only converting literal/raw
percent delimiters to %25. In practice, when building host (the variable used by
prepare_url()/prepare()), treat any '%' that is already followed by two hex
digits as an existing percent-encoding and leave it alone, and only replace
literal '%' delimiters (or '%' not followed by two hex digits) with '%25' (for
the legacy raw % case re-encode as %25<zone>). Ensure this reconstructed host is
used before requote_uri()/urlparse() so Python stdlib validation sees the
correctly-encoded %25 delimiter without producing double-encoded sequences.
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Adds support for IPv6 zone identifiers (scope IDs) in URLs, enabling correct handling of link-local IPv6 addresses such as http://[fe80::1%25eth0]:8080/.
Changes:
Fixes psf#6927, psf#6735, psf#7088.
Made-with: Cursor
Summary by CodeRabbit
New Features
Tests