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FA-28186 / HTTP redirects / Open access

Release an intermediate response before following its target: closed response ownership · case 01

Release an intermediate response before following its target: the closed response ownership branch emits an incorrect decision.

Verified by executionVariant 1 · 6 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The closed-response-ownership decision uses "'owned' if not closed else 'released'"; this violates the stipulated controller policy.

VERIFIED REPAIR

At this decision use "'released' if closed else ('canceling' if canceled else 'owned')", preserving the other controller outputs.

Unsuccessful approach: The partial repair uses "'released' if closed or canceled else 'owned'" and still fails an explicit boundary or control.

Case contract

Release an intermediate response before following its target. The explicit fixture inputs and outputs define a bounded offline policy; request identity must accompany the decision.

Why this case matters

Models a redirect controller decision before following a target or exposing a redirect result.

1 / The failure

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json
from urllib.parse import urlsplit, unquote, quote
import posixpath
import re
N = 1
observations = []
def solve(request, drained, remaining, reusable, closed, canceled, http2):
    return {'request': request, 'decision': [not drained and remaining > 0, reusable and drained and not closed, not http2 and remaining > 0 and not reusable, http2 and remaining > 0, not canceled and not closed, 'eof' if remaining == 0 else 'pending', not closed, remaining if not drained else 0, 'stream' if http2 else 'connection', 'owned' if not closed else 'released']} 
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve('/requests/' + str(N) + '/0', False, 8, True, False, False, False), {'request': '/requests/' + str(N) + '/0', 'decision': [True, False, False, False, True, 'pending', True, 8, 'connection', 'owned']})
check('fixture 2', solve('/requests/' + str(N) + '/1', True, 0, True, False, False, False), {'request': '/requests/' + str(N) + '/1', 'decision': [False, True, False, False, True, 'eof', True, 0, 'connection', 'owned']})
check('fixture 3', solve('/requests/' + str(N) + '/2', False, 3, False, False, False, False), {'request': '/requests/' + str(N) + '/2', 'decision': [True, False, True, False, True, 'pending', True, 3, 'connection', 'owned']})
check('fixture 4', solve('/requests/' + str(N) + '/3', False, 5, True, False, True, True), {'request': '/requests/' + str(N) + '/3', 'decision': [True, False, False, True, False, 'pending', True, 5, 'stream', 'canceling']})
check('fixture 5', solve('/requests/' + str(N) + '/4', True, 0, True, True, False, True), {'request': '/requests/' + str(N) + '/4', 'decision': [False, False, False, False, False, 'eof', False, 0, 'stream', 'released']})
check('fixture 6', solve('/requests/' + str(N) + '/5', False, 0, False, True, True, False), {'request': '/requests/' + str(N) + '/5', 'decision': [False, False, False, False, False, 'eof', False, 0, 'connection', 'released']})
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
fixture 1{'decision': [True, False, False, False, True, 'pending', True, 8, 'connection', 'owned'], 'request': '/requests/1/0'}{'decision': [True, False, False, False, True, 'pending', True, 8, 'connection', 'owned'], 'request': '/requests/1/0'}Passed
fixture 2{'decision': [False, True, False, False, True, 'eof', True, 0, 'connection', 'owned'], 'request': '/requests/1/1'}{'decision': [False, True, False, False, True, 'eof', True, 0, 'connection', 'owned'], 'request': '/requests/1/1'}Passed
fixture 3{'decision': [True, False, True, False, True, 'pending', True, 3, 'connection', 'owned'], 'request': '/requests/1/2'}{'decision': [True, False, True, False, True, 'pending', True, 3, 'connection', 'owned'], 'request': '/requests/1/2'}Passed
fixture 4{'decision': [True, False, False, True, False, 'pending', True, 5, 'stream', 'owned'], 'request': '/requests/1/3'}{'decision': [True, False, False, True, False, 'pending', True, 5, 'stream', 'canceling'], 'request': '/requests/1/3'}Failed
fixture 5{'decision': [False, False, False, False, False, 'eof', False, 0, 'stream', 'released'], 'request': '/requests/1/4'}{'decision': [False, False, False, False, False, 'eof', False, 0, 'stream', 'released'], 'request': '/requests/1/4'}Passed
fixture 6{'decision': [False, False, False, False, False, 'eof', False, 0, 'connection', 'released'], 'request': '/requests/1/5'}{'decision': [False, False, False, False, False, 'eof', False, 0, 'connection', 'released'], 'request': '/requests/1/5'}Passed

SHA-256 / b33fa926fc6536f5392c62bcce6ef3686f6a5a6389d299f3fb01dfffa373d310

2 / The unsuccessful fix

Exit 1
"""Failure Map reference implementation. Python standard library only."""
import json
from urllib.parse import urlsplit, unquote, quote
import posixpath
import re
N = 1
observations = []
def solve(request, drained, remaining, reusable, closed, canceled, http2):
    return {'request': request, 'decision': [not drained and remaining > 0, reusable and drained and not closed, not http2 and remaining > 0 and not reusable, http2 and remaining > 0, not canceled and not closed, 'eof' if remaining == 0 else 'pending', not closed, remaining if not drained else 0, 'stream' if http2 else 'connection', 'released' if closed or canceled else 'owned']} 
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve('/requests/' + str(N) + '/0', False, 8, True, False, False, False), {'request': '/requests/' + str(N) + '/0', 'decision': [True, False, False, False, True, 'pending', True, 8, 'connection', 'owned']})
check('fixture 2', solve('/requests/' + str(N) + '/1', True, 0, True, False, False, False), {'request': '/requests/' + str(N) + '/1', 'decision': [False, True, False, False, True, 'eof', True, 0, 'connection', 'owned']})
check('fixture 3', solve('/requests/' + str(N) + '/2', False, 3, False, False, False, False), {'request': '/requests/' + str(N) + '/2', 'decision': [True, False, True, False, True, 'pending', True, 3, 'connection', 'owned']})
check('fixture 4', solve('/requests/' + str(N) + '/3', False, 5, True, False, True, True), {'request': '/requests/' + str(N) + '/3', 'decision': [True, False, False, True, False, 'pending', True, 5, 'stream', 'canceling']})
check('fixture 5', solve('/requests/' + str(N) + '/4', True, 0, True, True, False, True), {'request': '/requests/' + str(N) + '/4', 'decision': [False, False, False, False, False, 'eof', False, 0, 'stream', 'released']})
check('fixture 6', solve('/requests/' + str(N) + '/5', False, 0, False, True, True, False), {'request': '/requests/' + str(N) + '/5', 'decision': [False, False, False, False, False, 'eof', False, 0, 'connection', 'released']})
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
fixture 1{'decision': [True, False, False, False, True, 'pending', True, 8, 'connection', 'owned'], 'request': '/requests/1/0'}{'decision': [True, False, False, False, True, 'pending', True, 8, 'connection', 'owned'], 'request': '/requests/1/0'}Passed
fixture 2{'decision': [False, True, False, False, True, 'eof', True, 0, 'connection', 'owned'], 'request': '/requests/1/1'}{'decision': [False, True, False, False, True, 'eof', True, 0, 'connection', 'owned'], 'request': '/requests/1/1'}Passed
fixture 3{'decision': [True, False, True, False, True, 'pending', True, 3, 'connection', 'owned'], 'request': '/requests/1/2'}{'decision': [True, False, True, False, True, 'pending', True, 3, 'connection', 'owned'], 'request': '/requests/1/2'}Passed
fixture 4{'decision': [True, False, False, True, False, 'pending', True, 5, 'stream', 'released'], 'request': '/requests/1/3'}{'decision': [True, False, False, True, False, 'pending', True, 5, 'stream', 'canceling'], 'request': '/requests/1/3'}Failed
fixture 5{'decision': [False, False, False, False, False, 'eof', False, 0, 'stream', 'released'], 'request': '/requests/1/4'}{'decision': [False, False, False, False, False, 'eof', False, 0, 'stream', 'released'], 'request': '/requests/1/4'}Passed
fixture 6{'decision': [False, False, False, False, False, 'eof', False, 0, 'connection', 'released'], 'request': '/requests/1/5'}{'decision': [False, False, False, False, False, 'eof', False, 0, 'connection', 'released'], 'request': '/requests/1/5'}Passed

SHA-256 / 4e8b465397ef90e88e0b74e17ae08f400cd61183c0ce304c56df30d2c8a4ee65

3 / The verified repair

Exit 0
"""Failure Map reference implementation. Python standard library only."""
import json
from urllib.parse import urlsplit, unquote, quote
import posixpath
import re
N = 1
observations = []
def solve(request, drained, remaining, reusable, closed, canceled, http2):
    return {'request': request, 'decision': [not drained and remaining > 0, reusable and drained and not closed, not http2 and remaining > 0 and not reusable, http2 and remaining > 0, not canceled and not closed, 'eof' if remaining == 0 else 'pending', not closed, remaining if not drained else 0, 'stream' if http2 else 'connection', 'released' if closed else ('canceling' if canceled else 'owned')]} 
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve('/requests/' + str(N) + '/0', False, 8, True, False, False, False), {'request': '/requests/' + str(N) + '/0', 'decision': [True, False, False, False, True, 'pending', True, 8, 'connection', 'owned']})
check('fixture 2', solve('/requests/' + str(N) + '/1', True, 0, True, False, False, False), {'request': '/requests/' + str(N) + '/1', 'decision': [False, True, False, False, True, 'eof', True, 0, 'connection', 'owned']})
check('fixture 3', solve('/requests/' + str(N) + '/2', False, 3, False, False, False, False), {'request': '/requests/' + str(N) + '/2', 'decision': [True, False, True, False, True, 'pending', True, 3, 'connection', 'owned']})
check('fixture 4', solve('/requests/' + str(N) + '/3', False, 5, True, False, True, True), {'request': '/requests/' + str(N) + '/3', 'decision': [True, False, False, True, False, 'pending', True, 5, 'stream', 'canceling']})
check('fixture 5', solve('/requests/' + str(N) + '/4', True, 0, True, True, False, True), {'request': '/requests/' + str(N) + '/4', 'decision': [False, False, False, False, False, 'eof', False, 0, 'stream', 'released']})
check('fixture 6', solve('/requests/' + str(N) + '/5', False, 0, False, True, True, False), {'request': '/requests/' + str(N) + '/5', 'decision': [False, False, False, False, False, 'eof', False, 0, 'connection', 'released']})
print(json.dumps({"observations": observations, "passed": all(x["passed"] for x in observations)}, ensure_ascii=False))
raise SystemExit(0 if all(x["passed"] for x in observations) else 1)
Boundary fixtureActualExpectedOutcome
fixture 1{'decision': [True, False, False, False, True, 'pending', True, 8, 'connection', 'owned'], 'request': '/requests/1/0'}{'decision': [True, False, False, False, True, 'pending', True, 8, 'connection', 'owned'], 'request': '/requests/1/0'}Passed
fixture 2{'decision': [False, True, False, False, True, 'eof', True, 0, 'connection', 'owned'], 'request': '/requests/1/1'}{'decision': [False, True, False, False, True, 'eof', True, 0, 'connection', 'owned'], 'request': '/requests/1/1'}Passed
fixture 3{'decision': [True, False, True, False, True, 'pending', True, 3, 'connection', 'owned'], 'request': '/requests/1/2'}{'decision': [True, False, True, False, True, 'pending', True, 3, 'connection', 'owned'], 'request': '/requests/1/2'}Passed
fixture 4{'decision': [True, False, False, True, False, 'pending', True, 5, 'stream', 'canceling'], 'request': '/requests/1/3'}{'decision': [True, False, False, True, False, 'pending', True, 5, 'stream', 'canceling'], 'request': '/requests/1/3'}Passed
fixture 5{'decision': [False, False, False, False, False, 'eof', False, 0, 'stream', 'released'], 'request': '/requests/1/4'}{'decision': [False, False, False, False, False, 'eof', False, 0, 'stream', 'released'], 'request': '/requests/1/4'}Passed
fixture 6{'decision': [False, False, False, False, False, 'eof', False, 0, 'connection', 'released'], 'request': '/requests/1/5'}{'decision': [False, False, False, False, False, 'eof', False, 0, 'connection', 'released'], 'request': '/requests/1/5'}Passed

SHA-256 / 204b11e22fc592885bad3b3fe88a5f7148c2a772a36a293f7ecc886355101675

Verification & scope

Stipulated offline redirect policy, not a complete HTTP, browser, URL, cache, or security implementation. Numbered variants vary request correlation identity. This reproducer isolates one failure mechanism. Results cover the supplied fixtures. Variants within a family share a test contract and should remain grouped when constructing evaluation splits. Related mechanisms with a shared evaluation_group must also remain together; these controlled models are not independent production incidents.

Observations recorded using Python 3.12.14 at 2026-09-29T14:41:31.704492+00:00.

Case digest / dcbf450080a3a898491e429ac0f43649deed4d81bcd7a178e19bd6181294831d