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FA-28916 / HTTP redirects / Open access

Match query-aware redirect rules against repeated decoded query fields: negation after aggregation · case 01

Match query-aware redirect rules against repeated decoded query fields: the negation after aggregation branch emits an incorrect decision.

Verified by executionVariant 1 · 9 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The negation-after-aggregation decision uses 'any(v!=required for k,v in pairs if k==key) if negate else any(v==required for k,v in pairs if k==key)'; this violates the stipulated controller policy.

VERIFIED REPAIR

At this decision use 'not any(v==required for k,v in pairs if k==key) if negate else any(v==required for k,v in pairs if k==key)', preserving the other controller outputs.

Unsuccessful approach: The partial repair uses 'any(v==required for k,v in pairs if k==key)' and still fails an explicit boundary or control.

Case contract

Match query-aware redirect rules against repeated decoded query fields. 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, pairs, key, required, case_sensitive, negate, require_all):
    return {'request': request, 'decision': [[v for k,v in pairs if k==key], [v for k,v in pairs if (k==key if case_sensitive else k.lower()==key.lower())], any(unquote(v)==required for k,v in pairs if k==key), any(k==key for k,v in pairs), bool([v for k,v in pairs if k==key]) and all(v==required for k,v in pairs if k==key), any(v!=required for k,v in pairs if k==key) if negate else any(v==required for k,v in pairs if k==key), any(v==required for k,v in pairs if k==key), sum(k==key for k,v in pairs), any(k==key and v==required for k,v in pairs), (bool(pairs) and all(v==required for k,v in pairs)) if require_all else any(v==required for k,v in pairs)]} 
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve('/requests/' + str(N) + '/0', [['q', 'a'], ['q', 'b']], 'q', 'b', True, False, False), {'request': '/requests/' + str(N) + '/0', 'decision': [['a', 'b'], ['a', 'b'], True, True, False, True, True, 2, True, True]})
check('fixture 2', solve('/requests/' + str(N) + '/1', [['Q', 'A']], 'q', 'a', False, False, True), {'request': '/requests/' + str(N) + '/1', 'decision': [[], ['A'], False, False, False, False, False, 0, False, False]})
check('fixture 3', solve('/requests/' + str(N) + '/2', [], 'q', '', True, True, False), {'request': '/requests/' + str(N) + '/2', 'decision': [[], [], False, False, False, True, False, 0, False, False]})
check('fixture 4', solve('/requests/' + str(N) + '/3', [['q', ''], ['q', 'x']], 'q', '', True, False, True), {'request': '/requests/' + str(N) + '/3', 'decision': [['', 'x'], ['', 'x'], True, True, False, True, True, 2, True, False]})
check('fixture 5', solve('/requests/' + str(N) + '/4', [['q', 'a'], ['q', 'a']], 'q', 'a', True, True, True), {'request': '/requests/' + str(N) + '/4', 'decision': [['a', 'a'], ['a', 'a'], True, True, True, False, True, 2, True, True]})
check('fixture 6', solve('/requests/' + str(N) + '/5', [['q', 'a%20b']], 'q', 'a b', True, False, False), {'request': '/requests/' + str(N) + '/5', 'decision': [['a%20b'], ['a%20b'], True, True, False, False, False, 1, False, False]})
check('fixture 7', solve('/requests/' + str(N) + '/6', [['Q', 'a']], 'q', 'a', True, False, False), {'request': '/requests/' + str(N) + '/6', 'decision': [[], [], False, False, False, False, False, 0, False, True]})
check('fixture 8', solve('/requests/' + str(N) + '/7', [['q', '']], 'q', '', True, False, False), {'request': '/requests/' + str(N) + '/7', 'decision': [[''], [''], True, True, True, True, True, 1, True, True]})
check('fixture 9', solve('/requests/' + str(N) + '/8', [['q', 'prefix']], 'q', 'pre', True, False, False), {'request': '/requests/' + str(N) + '/8', 'decision': [['prefix'], ['prefix'], False, True, False, False, False, 1, False, False]})
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': [['a', 'b'], ['a', 'b'], True, True, False, True, True, 2, True, True], 'request': '/requests/1/0'}{'decision': [['a', 'b'], ['a', 'b'], True, True, False, True, True, 2, True, True], 'request': '/requests/1/0'}Passed
fixture 2{'decision': [[], ['A'], False, False, False, False, False, 0, False, False], 'request': '/requests/1/1'}{'decision': [[], ['A'], False, False, False, False, False, 0, False, False], 'request': '/requests/1/1'}Passed
fixture 3{'decision': [[], [], False, False, False, False, False, 0, False, False], 'request': '/requests/1/2'}{'decision': [[], [], False, False, False, True, False, 0, False, False], 'request': '/requests/1/2'}Failed
fixture 4{'decision': [['', 'x'], ['', 'x'], True, True, False, True, True, 2, True, False], 'request': '/requests/1/3'}{'decision': [['', 'x'], ['', 'x'], True, True, False, True, True, 2, True, False], 'request': '/requests/1/3'}Passed
fixture 5{'decision': [['a', 'a'], ['a', 'a'], True, True, True, False, True, 2, True, True], 'request': '/requests/1/4'}{'decision': [['a', 'a'], ['a', 'a'], True, True, True, False, True, 2, True, True], 'request': '/requests/1/4'}Passed
fixture 6{'decision': [['a%20b'], ['a%20b'], True, True, False, False, False, 1, False, False], 'request': '/requests/1/5'}{'decision': [['a%20b'], ['a%20b'], True, True, False, False, False, 1, False, False], 'request': '/requests/1/5'}Passed
fixture 7{'decision': [[], [], False, False, False, False, False, 0, False, True], 'request': '/requests/1/6'}{'decision': [[], [], False, False, False, False, False, 0, False, True], 'request': '/requests/1/6'}Passed
fixture 8{'decision': [[''], [''], True, True, True, True, True, 1, True, True], 'request': '/requests/1/7'}{'decision': [[''], [''], True, True, True, True, True, 1, True, True], 'request': '/requests/1/7'}Passed
fixture 9{'decision': [['prefix'], ['prefix'], False, True, False, False, False, 1, False, False], 'request': '/requests/1/8'}{'decision': [['prefix'], ['prefix'], False, True, False, False, False, 1, False, False], 'request': '/requests/1/8'}Passed

SHA-256 / 7373cf0135ccd42976a6d15ae531ddddeff2bec2470757eaacb42e827b981ef5

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, pairs, key, required, case_sensitive, negate, require_all):
    return {'request': request, 'decision': [[v for k,v in pairs if k==key], [v for k,v in pairs if (k==key if case_sensitive else k.lower()==key.lower())], any(unquote(v)==required for k,v in pairs if k==key), any(k==key for k,v in pairs), bool([v for k,v in pairs if k==key]) and all(v==required for k,v in pairs if k==key), any(v==required for k,v in pairs if k==key), any(v==required for k,v in pairs if k==key), sum(k==key for k,v in pairs), any(k==key and v==required for k,v in pairs), (bool(pairs) and all(v==required for k,v in pairs)) if require_all else any(v==required for k,v in pairs)]} 
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve('/requests/' + str(N) + '/0', [['q', 'a'], ['q', 'b']], 'q', 'b', True, False, False), {'request': '/requests/' + str(N) + '/0', 'decision': [['a', 'b'], ['a', 'b'], True, True, False, True, True, 2, True, True]})
check('fixture 2', solve('/requests/' + str(N) + '/1', [['Q', 'A']], 'q', 'a', False, False, True), {'request': '/requests/' + str(N) + '/1', 'decision': [[], ['A'], False, False, False, False, False, 0, False, False]})
check('fixture 3', solve('/requests/' + str(N) + '/2', [], 'q', '', True, True, False), {'request': '/requests/' + str(N) + '/2', 'decision': [[], [], False, False, False, True, False, 0, False, False]})
check('fixture 4', solve('/requests/' + str(N) + '/3', [['q', ''], ['q', 'x']], 'q', '', True, False, True), {'request': '/requests/' + str(N) + '/3', 'decision': [['', 'x'], ['', 'x'], True, True, False, True, True, 2, True, False]})
check('fixture 5', solve('/requests/' + str(N) + '/4', [['q', 'a'], ['q', 'a']], 'q', 'a', True, True, True), {'request': '/requests/' + str(N) + '/4', 'decision': [['a', 'a'], ['a', 'a'], True, True, True, False, True, 2, True, True]})
check('fixture 6', solve('/requests/' + str(N) + '/5', [['q', 'a%20b']], 'q', 'a b', True, False, False), {'request': '/requests/' + str(N) + '/5', 'decision': [['a%20b'], ['a%20b'], True, True, False, False, False, 1, False, False]})
check('fixture 7', solve('/requests/' + str(N) + '/6', [['Q', 'a']], 'q', 'a', True, False, False), {'request': '/requests/' + str(N) + '/6', 'decision': [[], [], False, False, False, False, False, 0, False, True]})
check('fixture 8', solve('/requests/' + str(N) + '/7', [['q', '']], 'q', '', True, False, False), {'request': '/requests/' + str(N) + '/7', 'decision': [[''], [''], True, True, True, True, True, 1, True, True]})
check('fixture 9', solve('/requests/' + str(N) + '/8', [['q', 'prefix']], 'q', 'pre', True, False, False), {'request': '/requests/' + str(N) + '/8', 'decision': [['prefix'], ['prefix'], False, True, False, False, False, 1, False, False]})
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': [['a', 'b'], ['a', 'b'], True, True, False, True, True, 2, True, True], 'request': '/requests/1/0'}{'decision': [['a', 'b'], ['a', 'b'], True, True, False, True, True, 2, True, True], 'request': '/requests/1/0'}Passed
fixture 2{'decision': [[], ['A'], False, False, False, False, False, 0, False, False], 'request': '/requests/1/1'}{'decision': [[], ['A'], False, False, False, False, False, 0, False, False], 'request': '/requests/1/1'}Passed
fixture 3{'decision': [[], [], False, False, False, False, False, 0, False, False], 'request': '/requests/1/2'}{'decision': [[], [], False, False, False, True, False, 0, False, False], 'request': '/requests/1/2'}Failed
fixture 4{'decision': [['', 'x'], ['', 'x'], True, True, False, True, True, 2, True, False], 'request': '/requests/1/3'}{'decision': [['', 'x'], ['', 'x'], True, True, False, True, True, 2, True, False], 'request': '/requests/1/3'}Passed
fixture 5{'decision': [['a', 'a'], ['a', 'a'], True, True, True, True, True, 2, True, True], 'request': '/requests/1/4'}{'decision': [['a', 'a'], ['a', 'a'], True, True, True, False, True, 2, True, True], 'request': '/requests/1/4'}Failed
fixture 6{'decision': [['a%20b'], ['a%20b'], True, True, False, False, False, 1, False, False], 'request': '/requests/1/5'}{'decision': [['a%20b'], ['a%20b'], True, True, False, False, False, 1, False, False], 'request': '/requests/1/5'}Passed
fixture 7{'decision': [[], [], False, False, False, False, False, 0, False, True], 'request': '/requests/1/6'}{'decision': [[], [], False, False, False, False, False, 0, False, True], 'request': '/requests/1/6'}Passed
fixture 8{'decision': [[''], [''], True, True, True, True, True, 1, True, True], 'request': '/requests/1/7'}{'decision': [[''], [''], True, True, True, True, True, 1, True, True], 'request': '/requests/1/7'}Passed
fixture 9{'decision': [['prefix'], ['prefix'], False, True, False, False, False, 1, False, False], 'request': '/requests/1/8'}{'decision': [['prefix'], ['prefix'], False, True, False, False, False, 1, False, False], 'request': '/requests/1/8'}Passed

SHA-256 / 05893c4256b72875f3d600fba7a0f17922c4f3b04a4950f4cd1183ea2c3644ff

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, pairs, key, required, case_sensitive, negate, require_all):
    return {'request': request, 'decision': [[v for k,v in pairs if k==key], [v for k,v in pairs if (k==key if case_sensitive else k.lower()==key.lower())], any(unquote(v)==required for k,v in pairs if k==key), any(k==key for k,v in pairs), bool([v for k,v in pairs if k==key]) and all(v==required for k,v in pairs if k==key), not any(v==required for k,v in pairs if k==key) if negate else any(v==required for k,v in pairs if k==key), any(v==required for k,v in pairs if k==key), sum(k==key for k,v in pairs), any(k==key and v==required for k,v in pairs), (bool(pairs) and all(v==required for k,v in pairs)) if require_all else any(v==required for k,v in pairs)]} 
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve('/requests/' + str(N) + '/0', [['q', 'a'], ['q', 'b']], 'q', 'b', True, False, False), {'request': '/requests/' + str(N) + '/0', 'decision': [['a', 'b'], ['a', 'b'], True, True, False, True, True, 2, True, True]})
check('fixture 2', solve('/requests/' + str(N) + '/1', [['Q', 'A']], 'q', 'a', False, False, True), {'request': '/requests/' + str(N) + '/1', 'decision': [[], ['A'], False, False, False, False, False, 0, False, False]})
check('fixture 3', solve('/requests/' + str(N) + '/2', [], 'q', '', True, True, False), {'request': '/requests/' + str(N) + '/2', 'decision': [[], [], False, False, False, True, False, 0, False, False]})
check('fixture 4', solve('/requests/' + str(N) + '/3', [['q', ''], ['q', 'x']], 'q', '', True, False, True), {'request': '/requests/' + str(N) + '/3', 'decision': [['', 'x'], ['', 'x'], True, True, False, True, True, 2, True, False]})
check('fixture 5', solve('/requests/' + str(N) + '/4', [['q', 'a'], ['q', 'a']], 'q', 'a', True, True, True), {'request': '/requests/' + str(N) + '/4', 'decision': [['a', 'a'], ['a', 'a'], True, True, True, False, True, 2, True, True]})
check('fixture 6', solve('/requests/' + str(N) + '/5', [['q', 'a%20b']], 'q', 'a b', True, False, False), {'request': '/requests/' + str(N) + '/5', 'decision': [['a%20b'], ['a%20b'], True, True, False, False, False, 1, False, False]})
check('fixture 7', solve('/requests/' + str(N) + '/6', [['Q', 'a']], 'q', 'a', True, False, False), {'request': '/requests/' + str(N) + '/6', 'decision': [[], [], False, False, False, False, False, 0, False, True]})
check('fixture 8', solve('/requests/' + str(N) + '/7', [['q', '']], 'q', '', True, False, False), {'request': '/requests/' + str(N) + '/7', 'decision': [[''], [''], True, True, True, True, True, 1, True, True]})
check('fixture 9', solve('/requests/' + str(N) + '/8', [['q', 'prefix']], 'q', 'pre', True, False, False), {'request': '/requests/' + str(N) + '/8', 'decision': [['prefix'], ['prefix'], False, True, False, False, False, 1, False, False]})
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': [['a', 'b'], ['a', 'b'], True, True, False, True, True, 2, True, True], 'request': '/requests/1/0'}{'decision': [['a', 'b'], ['a', 'b'], True, True, False, True, True, 2, True, True], 'request': '/requests/1/0'}Passed
fixture 2{'decision': [[], ['A'], False, False, False, False, False, 0, False, False], 'request': '/requests/1/1'}{'decision': [[], ['A'], False, False, False, False, False, 0, False, False], 'request': '/requests/1/1'}Passed
fixture 3{'decision': [[], [], False, False, False, True, False, 0, False, False], 'request': '/requests/1/2'}{'decision': [[], [], False, False, False, True, False, 0, False, False], 'request': '/requests/1/2'}Passed
fixture 4{'decision': [['', 'x'], ['', 'x'], True, True, False, True, True, 2, True, False], 'request': '/requests/1/3'}{'decision': [['', 'x'], ['', 'x'], True, True, False, True, True, 2, True, False], 'request': '/requests/1/3'}Passed
fixture 5{'decision': [['a', 'a'], ['a', 'a'], True, True, True, False, True, 2, True, True], 'request': '/requests/1/4'}{'decision': [['a', 'a'], ['a', 'a'], True, True, True, False, True, 2, True, True], 'request': '/requests/1/4'}Passed
fixture 6{'decision': [['a%20b'], ['a%20b'], True, True, False, False, False, 1, False, False], 'request': '/requests/1/5'}{'decision': [['a%20b'], ['a%20b'], True, True, False, False, False, 1, False, False], 'request': '/requests/1/5'}Passed
fixture 7{'decision': [[], [], False, False, False, False, False, 0, False, True], 'request': '/requests/1/6'}{'decision': [[], [], False, False, False, False, False, 0, False, True], 'request': '/requests/1/6'}Passed
fixture 8{'decision': [[''], [''], True, True, True, True, True, 1, True, True], 'request': '/requests/1/7'}{'decision': [[''], [''], True, True, True, True, True, 1, True, True], 'request': '/requests/1/7'}Passed
fixture 9{'decision': [['prefix'], ['prefix'], False, True, False, False, False, 1, False, False], 'request': '/requests/1/8'}{'decision': [['prefix'], ['prefix'], False, True, False, False, False, 1, False, False], 'request': '/requests/1/8'}Passed

SHA-256 / 89fec3af5aa20dd8df56775120d3889ce47d3eebc0538d076da251724411c6c9

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 2026-09-29T14:41:38.232705+00:00.

Case digest / ac44eef8cf90b1a0e0313e7aad59af1ff0a13f7cafa247466336200bd4f65567