FA-29186 / HTTP redirects / Open access
Extract redirect route captures under an explicit segment-matching grammar: greedy capture availability · case 01
Extract redirect route captures under an explicit segment-matching grammar: the greedy capture availability branch emits an incorrect decision.
ROOT CAUSE
The greedy-capture-availability decision uses 'greedy'; this violates the stipulated controller policy.
VERIFIED REPAIR
At this decision use 'greedy and len(segments)>1', preserving the other controller outputs.
Unsuccessful approach: The partial repair uses 'len(segments)>1' and still fails an explicit boundary or control.
Case contract
Extract redirect route captures under an explicit segment-matching grammar. 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, path, prefix, segments, greedy, case_sensitive, suffix):
return {'request': request, 'decision': [path[len(prefix):] if path.startswith(prefix) else None, segments[1] if len(segments)>1 else None, '/'.join(segments[1:]) if greedy else (segments[1] if len(segments)>1 else ''), path.startswith(prefix) if case_sensitive else path.lower().startswith(prefix.lower()), segments, path[:-len(suffix)] if suffix and path.endswith(suffix) else path, '.' in path, segments[1:], len(segments), greedy]}
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve('/requests/' + str(N) + '/0', '/api/a/b', '/api', ['api', 'a', 'b'], True, True, '.json'), {'request': '/requests/' + str(N) + '/0', 'decision': ['/a/b', 'a', 'a/b', True, ['api', 'a', 'b'], '/api/a/b', False, ['a', 'b'], 3, True]})
check('fixture 2', solve('/requests/' + str(N) + '/1', '/API/a', '/api', ['API', 'a'], False, False, ''), {'request': '/requests/' + str(N) + '/1', 'decision': [None, 'a', 'a', True, ['API', 'a'], '/API/a', False, ['a'], 2, False]})
check('fixture 3', solve('/requests/' + str(N) + '/2', '/api', '/api', ['api'], True, True, ''), {'request': '/requests/' + str(N) + '/2', 'decision': ['', None, '', True, ['api'], '/api', False, [], 1, False]})
check('fixture 4', solve('/requests/' + str(N) + '/3', '/apix/a', '/api', ['apix', 'a'], False, True, '.txt'), {'request': '/requests/' + str(N) + '/3', 'decision': ['x/a', 'a', 'a', True, ['apix', 'a'], '/apix/a', False, ['a'], 2, False]})
check('fixture 5', solve('/requests/' + str(N) + '/4', '/api/a//b/', '/api', ['api', 'a', '', 'b', ''], True, True, '/'), {'request': '/requests/' + str(N) + '/4', 'decision': ['/a//b/', 'a', 'a//b/', True, ['api', 'a', '', 'b', ''], '/api/a//b', False, ['a', '', 'b', ''], 5, True]})
check('fixture 6', solve('/requests/' + str(N) + '/5', '/api/a.json', '/api', ['api', 'a.json'], False, True, '.json'), {'request': '/requests/' + str(N) + '/5', 'decision': ['/a.json', 'a.json', 'a.json', True, ['api', 'a.json'], '/api/a', True, ['a.json'], 2, False]})
check('fixture 7', solve('/requests/' + str(N) + '/6', '/API/a', '/api', ['API', 'a'], False, True, ''), {'request': '/requests/' + str(N) + '/6', 'decision': [None, 'a', 'a', False, ['API', 'a'], '/API/a', False, ['a'], 2, 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 fixture | Actual | Expected | Outcome |
|---|---|---|---|
| fixture 1 | {'decision': ['/a/b', 'a', 'a/b', True, ['api', 'a', 'b'], '/api/a/b', False, ['a', 'b'], 3, True], 'request': '/requests/1/0'} | {'decision': ['/a/b', 'a', 'a/b', True, ['api', 'a', 'b'], '/api/a/b', False, ['a', 'b'], 3, True], 'request': '/requests/1/0'} | Passed |
| fixture 2 | {'decision': [None, 'a', 'a', True, ['API', 'a'], '/API/a', False, ['a'], 2, False], 'request': '/requests/1/1'} | {'decision': [None, 'a', 'a', True, ['API', 'a'], '/API/a', False, ['a'], 2, False], 'request': '/requests/1/1'} | Passed |
| fixture 3 | {'decision': ['', None, '', True, ['api'], '/api', False, [], 1, True], 'request': '/requests/1/2'} | {'decision': ['', None, '', True, ['api'], '/api', False, [], 1, False], 'request': '/requests/1/2'} | Failed |
| fixture 4 | {'decision': ['x/a', 'a', 'a', True, ['apix', 'a'], '/apix/a', False, ['a'], 2, False], 'request': '/requests/1/3'} | {'decision': ['x/a', 'a', 'a', True, ['apix', 'a'], '/apix/a', False, ['a'], 2, False], 'request': '/requests/1/3'} | Passed |
| fixture 5 | {'decision': ['/a//b/', 'a', 'a//b/', True, ['api', 'a', '', 'b', ''], '/api/a//b', False, ['a', '', 'b', ''], 5, True], 'request': '/requests/1/4'} | {'decision': ['/a//b/', 'a', 'a//b/', True, ['api', 'a', '', 'b', ''], '/api/a//b', False, ['a', '', 'b', ''], 5, True], 'request': '/requests/1/4'} | Passed |
| fixture 6 | {'decision': ['/a.json', 'a.json', 'a.json', True, ['api', 'a.json'], '/api/a', True, ['a.json'], 2, False], 'request': '/requests/1/5'} | {'decision': ['/a.json', 'a.json', 'a.json', True, ['api', 'a.json'], '/api/a', True, ['a.json'], 2, False], 'request': '/requests/1/5'} | Passed |
| fixture 7 | {'decision': [None, 'a', 'a', False, ['API', 'a'], '/API/a', False, ['a'], 2, False], 'request': '/requests/1/6'} | {'decision': [None, 'a', 'a', False, ['API', 'a'], '/API/a', False, ['a'], 2, False], 'request': '/requests/1/6'} | Passed |
SHA-256 / 65d7543b89ea85ff750738ab8a21a33b073a818c34729f416ef35fda3d87a709
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, path, prefix, segments, greedy, case_sensitive, suffix):
return {'request': request, 'decision': [path[len(prefix):] if path.startswith(prefix) else None, segments[1] if len(segments)>1 else None, '/'.join(segments[1:]) if greedy else (segments[1] if len(segments)>1 else ''), path.startswith(prefix) if case_sensitive else path.lower().startswith(prefix.lower()), segments, path[:-len(suffix)] if suffix and path.endswith(suffix) else path, '.' in path, segments[1:], len(segments), len(segments)>1]}
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve('/requests/' + str(N) + '/0', '/api/a/b', '/api', ['api', 'a', 'b'], True, True, '.json'), {'request': '/requests/' + str(N) + '/0', 'decision': ['/a/b', 'a', 'a/b', True, ['api', 'a', 'b'], '/api/a/b', False, ['a', 'b'], 3, True]})
check('fixture 2', solve('/requests/' + str(N) + '/1', '/API/a', '/api', ['API', 'a'], False, False, ''), {'request': '/requests/' + str(N) + '/1', 'decision': [None, 'a', 'a', True, ['API', 'a'], '/API/a', False, ['a'], 2, False]})
check('fixture 3', solve('/requests/' + str(N) + '/2', '/api', '/api', ['api'], True, True, ''), {'request': '/requests/' + str(N) + '/2', 'decision': ['', None, '', True, ['api'], '/api', False, [], 1, False]})
check('fixture 4', solve('/requests/' + str(N) + '/3', '/apix/a', '/api', ['apix', 'a'], False, True, '.txt'), {'request': '/requests/' + str(N) + '/3', 'decision': ['x/a', 'a', 'a', True, ['apix', 'a'], '/apix/a', False, ['a'], 2, False]})
check('fixture 5', solve('/requests/' + str(N) + '/4', '/api/a//b/', '/api', ['api', 'a', '', 'b', ''], True, True, '/'), {'request': '/requests/' + str(N) + '/4', 'decision': ['/a//b/', 'a', 'a//b/', True, ['api', 'a', '', 'b', ''], '/api/a//b', False, ['a', '', 'b', ''], 5, True]})
check('fixture 6', solve('/requests/' + str(N) + '/5', '/api/a.json', '/api', ['api', 'a.json'], False, True, '.json'), {'request': '/requests/' + str(N) + '/5', 'decision': ['/a.json', 'a.json', 'a.json', True, ['api', 'a.json'], '/api/a', True, ['a.json'], 2, False]})
check('fixture 7', solve('/requests/' + str(N) + '/6', '/API/a', '/api', ['API', 'a'], False, True, ''), {'request': '/requests/' + str(N) + '/6', 'decision': [None, 'a', 'a', False, ['API', 'a'], '/API/a', False, ['a'], 2, 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 fixture | Actual | Expected | Outcome |
|---|---|---|---|
| fixture 1 | {'decision': ['/a/b', 'a', 'a/b', True, ['api', 'a', 'b'], '/api/a/b', False, ['a', 'b'], 3, True], 'request': '/requests/1/0'} | {'decision': ['/a/b', 'a', 'a/b', True, ['api', 'a', 'b'], '/api/a/b', False, ['a', 'b'], 3, True], 'request': '/requests/1/0'} | Passed |
| fixture 2 | {'decision': [None, 'a', 'a', True, ['API', 'a'], '/API/a', False, ['a'], 2, True], 'request': '/requests/1/1'} | {'decision': [None, 'a', 'a', True, ['API', 'a'], '/API/a', False, ['a'], 2, False], 'request': '/requests/1/1'} | Failed |
| fixture 3 | {'decision': ['', None, '', True, ['api'], '/api', False, [], 1, False], 'request': '/requests/1/2'} | {'decision': ['', None, '', True, ['api'], '/api', False, [], 1, False], 'request': '/requests/1/2'} | Passed |
| fixture 4 | {'decision': ['x/a', 'a', 'a', True, ['apix', 'a'], '/apix/a', False, ['a'], 2, True], 'request': '/requests/1/3'} | {'decision': ['x/a', 'a', 'a', True, ['apix', 'a'], '/apix/a', False, ['a'], 2, False], 'request': '/requests/1/3'} | Failed |
| fixture 5 | {'decision': ['/a//b/', 'a', 'a//b/', True, ['api', 'a', '', 'b', ''], '/api/a//b', False, ['a', '', 'b', ''], 5, True], 'request': '/requests/1/4'} | {'decision': ['/a//b/', 'a', 'a//b/', True, ['api', 'a', '', 'b', ''], '/api/a//b', False, ['a', '', 'b', ''], 5, True], 'request': '/requests/1/4'} | Passed |
| fixture 6 | {'decision': ['/a.json', 'a.json', 'a.json', True, ['api', 'a.json'], '/api/a', True, ['a.json'], 2, True], 'request': '/requests/1/5'} | {'decision': ['/a.json', 'a.json', 'a.json', True, ['api', 'a.json'], '/api/a', True, ['a.json'], 2, False], 'request': '/requests/1/5'} | Failed |
| fixture 7 | {'decision': [None, 'a', 'a', False, ['API', 'a'], '/API/a', False, ['a'], 2, True], 'request': '/requests/1/6'} | {'decision': [None, 'a', 'a', False, ['API', 'a'], '/API/a', False, ['a'], 2, False], 'request': '/requests/1/6'} | Failed |
SHA-256 / a1c5d9e028601a8761dd2de3f0b2ea4826ee8b6bb8c107a23d464b08ff319b1d
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, path, prefix, segments, greedy, case_sensitive, suffix):
return {'request': request, 'decision': [path[len(prefix):] if path.startswith(prefix) else None, segments[1] if len(segments)>1 else None, '/'.join(segments[1:]) if greedy else (segments[1] if len(segments)>1 else ''), path.startswith(prefix) if case_sensitive else path.lower().startswith(prefix.lower()), segments, path[:-len(suffix)] if suffix and path.endswith(suffix) else path, '.' in path, segments[1:], len(segments), greedy and len(segments)>1]}
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve('/requests/' + str(N) + '/0', '/api/a/b', '/api', ['api', 'a', 'b'], True, True, '.json'), {'request': '/requests/' + str(N) + '/0', 'decision': ['/a/b', 'a', 'a/b', True, ['api', 'a', 'b'], '/api/a/b', False, ['a', 'b'], 3, True]})
check('fixture 2', solve('/requests/' + str(N) + '/1', '/API/a', '/api', ['API', 'a'], False, False, ''), {'request': '/requests/' + str(N) + '/1', 'decision': [None, 'a', 'a', True, ['API', 'a'], '/API/a', False, ['a'], 2, False]})
check('fixture 3', solve('/requests/' + str(N) + '/2', '/api', '/api', ['api'], True, True, ''), {'request': '/requests/' + str(N) + '/2', 'decision': ['', None, '', True, ['api'], '/api', False, [], 1, False]})
check('fixture 4', solve('/requests/' + str(N) + '/3', '/apix/a', '/api', ['apix', 'a'], False, True, '.txt'), {'request': '/requests/' + str(N) + '/3', 'decision': ['x/a', 'a', 'a', True, ['apix', 'a'], '/apix/a', False, ['a'], 2, False]})
check('fixture 5', solve('/requests/' + str(N) + '/4', '/api/a//b/', '/api', ['api', 'a', '', 'b', ''], True, True, '/'), {'request': '/requests/' + str(N) + '/4', 'decision': ['/a//b/', 'a', 'a//b/', True, ['api', 'a', '', 'b', ''], '/api/a//b', False, ['a', '', 'b', ''], 5, True]})
check('fixture 6', solve('/requests/' + str(N) + '/5', '/api/a.json', '/api', ['api', 'a.json'], False, True, '.json'), {'request': '/requests/' + str(N) + '/5', 'decision': ['/a.json', 'a.json', 'a.json', True, ['api', 'a.json'], '/api/a', True, ['a.json'], 2, False]})
check('fixture 7', solve('/requests/' + str(N) + '/6', '/API/a', '/api', ['API', 'a'], False, True, ''), {'request': '/requests/' + str(N) + '/6', 'decision': [None, 'a', 'a', False, ['API', 'a'], '/API/a', False, ['a'], 2, 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 fixture | Actual | Expected | Outcome |
|---|---|---|---|
| fixture 1 | {'decision': ['/a/b', 'a', 'a/b', True, ['api', 'a', 'b'], '/api/a/b', False, ['a', 'b'], 3, True], 'request': '/requests/1/0'} | {'decision': ['/a/b', 'a', 'a/b', True, ['api', 'a', 'b'], '/api/a/b', False, ['a', 'b'], 3, True], 'request': '/requests/1/0'} | Passed |
| fixture 2 | {'decision': [None, 'a', 'a', True, ['API', 'a'], '/API/a', False, ['a'], 2, False], 'request': '/requests/1/1'} | {'decision': [None, 'a', 'a', True, ['API', 'a'], '/API/a', False, ['a'], 2, False], 'request': '/requests/1/1'} | Passed |
| fixture 3 | {'decision': ['', None, '', True, ['api'], '/api', False, [], 1, False], 'request': '/requests/1/2'} | {'decision': ['', None, '', True, ['api'], '/api', False, [], 1, False], 'request': '/requests/1/2'} | Passed |
| fixture 4 | {'decision': ['x/a', 'a', 'a', True, ['apix', 'a'], '/apix/a', False, ['a'], 2, False], 'request': '/requests/1/3'} | {'decision': ['x/a', 'a', 'a', True, ['apix', 'a'], '/apix/a', False, ['a'], 2, False], 'request': '/requests/1/3'} | Passed |
| fixture 5 | {'decision': ['/a//b/', 'a', 'a//b/', True, ['api', 'a', '', 'b', ''], '/api/a//b', False, ['a', '', 'b', ''], 5, True], 'request': '/requests/1/4'} | {'decision': ['/a//b/', 'a', 'a//b/', True, ['api', 'a', '', 'b', ''], '/api/a//b', False, ['a', '', 'b', ''], 5, True], 'request': '/requests/1/4'} | Passed |
| fixture 6 | {'decision': ['/a.json', 'a.json', 'a.json', True, ['api', 'a.json'], '/api/a', True, ['a.json'], 2, False], 'request': '/requests/1/5'} | {'decision': ['/a.json', 'a.json', 'a.json', True, ['api', 'a.json'], '/api/a', True, ['a.json'], 2, False], 'request': '/requests/1/5'} | Passed |
| fixture 7 | {'decision': [None, 'a', 'a', False, ['API', 'a'], '/API/a', False, ['a'], 2, False], 'request': '/requests/1/6'} | {'decision': [None, 'a', 'a', False, ['API', 'a'], '/API/a', False, ['a'], 2, False], 'request': '/requests/1/6'} | Passed |
SHA-256 / 465e4c59b54316d0d35460eaa77cab148ce48321e5041341c6e129e08398745e
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 2026-09-29T14:41:40.848919+00:00.
Case digest / fe6fc6025acedadab3037133fedfab35ed6bef8b2a6d96c8a8a326f7e3f5dd1d