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FA-29301 / HTTP redirects / Open access

Report redirect failures with the failing phase and completed request context: attempted target context · case 01

Report redirect failures with the failing phase and completed request context: the attempted target context branch emits an incorrect decision.

Verified by executionVariant 1 · 7 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The attempted-target-context decision uses 'completed[-1] if completed else original'; this violates the stipulated controller policy.

THE FAILURE

The attempted-target-context decision uses 'completed[-1] if completed else original'; this violates the stipulated controller policy.

Unsuccessful approach: The partial repair uses 'original' and still fails an explicit boundary or control.

Case contract

Report redirect failures with the failing phase and completed request context. 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, phase, code, completed, attempted, rejected, original):
    return {'request': request, 'decision': [phase, original, completed[-1] if completed else original, completed, code if code is not None else 'none', code is not None, completed[-1] if completed else None, phase in ('parse','policy'), completed, rejected or phase == 'parse']} 
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve('/requests/' + str(N) + '/0', 'parse', 'invalid-target', ['/a'], 'bad%', True, '/a'), {'request': '/requests/' + str(N) + '/0', 'decision': ['parse', '/a', 'bad%', ['/a'], 'invalid-target', True, '/a', True, ['/a'], True]})
check('fixture 2', solve('/requests/' + str(N) + '/1', 'policy', 'blocked', ['/a', '/b'], '/c', True, '/a'), {'request': '/requests/' + str(N) + '/1', 'decision': ['policy', '/a', '/c', ['/a', '/b'], 'blocked', True, '/b', True, ['/a', '/b'], True]})
check('fixture 3', solve('/requests/' + str(N) + '/2', 'dispatch', 'closed', ['/a'], '/b', False, '/a'), {'request': '/requests/' + str(N) + '/2', 'decision': ['dispatch', '/a', '/b', ['/a'], 'closed', True, '/a', False, ['/a'], False]})
check('fixture 4', solve('/requests/' + str(N) + '/3', 'response', 'body-error', [], '/x', False, '/x'), {'request': '/requests/' + str(N) + '/3', 'decision': ['response', '/x', '/x', [], 'body-error', True, None, False, [], False]})
check('fixture 5', solve('/requests/' + str(N) + '/4', 'complete', None, ['/a', '/b'], '/b', False, '/a'), {'request': '/requests/' + str(N) + '/4', 'decision': ['complete', '/a', '/b', ['/a', '/b'], 'none', False, '/b', False, ['/a', '/b'], False]})
check('fixture 6', solve('/requests/' + str(N) + '/5', 'policy', 'blocked', [], '/x', True, '/x'), {'request': '/requests/' + str(N) + '/5', 'decision': ['policy', '/x', '/x', [], 'blocked', True, None, True, [], True]})
check('fixture 7', solve('/requests/' + str(N) + '/6', 'parse', 'invalid-target', ['/z', '/a'], 'bad%', False, '/z'), {'request': '/requests/' + str(N) + '/6', 'decision': ['parse', '/z', 'bad%', ['/z', '/a'], 'invalid-target', True, '/a', True, ['/z', '/a'], True]})
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': ['parse', '/a', '/a', ['/a'], 'invalid-target', True, '/a', True, ['/a'], True], 'request': '/requests/1/0'}{'decision': ['parse', '/a', 'bad%', ['/a'], 'invalid-target', True, '/a', True, ['/a'], True], 'request': '/requests/1/0'}Failed
fixture 2{'decision': ['policy', '/a', '/b', ['/a', '/b'], 'blocked', True, '/b', True, ['/a', '/b'], True], 'request': '/requests/1/1'}{'decision': ['policy', '/a', '/c', ['/a', '/b'], 'blocked', True, '/b', True, ['/a', '/b'], True], 'request': '/requests/1/1'}Failed
fixture 3{'decision': ['dispatch', '/a', '/a', ['/a'], 'closed', True, '/a', False, ['/a'], False], 'request': '/requests/1/2'}{'decision': ['dispatch', '/a', '/b', ['/a'], 'closed', True, '/a', False, ['/a'], False], 'request': '/requests/1/2'}Failed
fixture 4{'decision': ['response', '/x', '/x', [], 'body-error', True, None, False, [], False], 'request': '/requests/1/3'}{'decision': ['response', '/x', '/x', [], 'body-error', True, None, False, [], False], 'request': '/requests/1/3'}Passed
fixture 5{'decision': ['complete', '/a', '/b', ['/a', '/b'], 'none', False, '/b', False, ['/a', '/b'], False], 'request': '/requests/1/4'}{'decision': ['complete', '/a', '/b', ['/a', '/b'], 'none', False, '/b', False, ['/a', '/b'], False], 'request': '/requests/1/4'}Passed
fixture 6{'decision': ['policy', '/x', '/x', [], 'blocked', True, None, True, [], True], 'request': '/requests/1/5'}{'decision': ['policy', '/x', '/x', [], 'blocked', True, None, True, [], True], 'request': '/requests/1/5'}Passed
fixture 7{'decision': ['parse', '/z', '/a', ['/z', '/a'], 'invalid-target', True, '/a', True, ['/z', '/a'], True], 'request': '/requests/1/6'}{'decision': ['parse', '/z', 'bad%', ['/z', '/a'], 'invalid-target', True, '/a', True, ['/z', '/a'], True], 'request': '/requests/1/6'}Failed

SHA-256 / ac2bc211428109c0f70c06241cf07877cdae4e1f7de120565cc916fad9d9f572

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, phase, code, completed, attempted, rejected, original):
    return {'request': request, 'decision': [phase, original, original, completed, code if code is not None else 'none', code is not None, completed[-1] if completed else None, phase in ('parse','policy'), completed, rejected or phase == 'parse']} 
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve('/requests/' + str(N) + '/0', 'parse', 'invalid-target', ['/a'], 'bad%', True, '/a'), {'request': '/requests/' + str(N) + '/0', 'decision': ['parse', '/a', 'bad%', ['/a'], 'invalid-target', True, '/a', True, ['/a'], True]})
check('fixture 2', solve('/requests/' + str(N) + '/1', 'policy', 'blocked', ['/a', '/b'], '/c', True, '/a'), {'request': '/requests/' + str(N) + '/1', 'decision': ['policy', '/a', '/c', ['/a', '/b'], 'blocked', True, '/b', True, ['/a', '/b'], True]})
check('fixture 3', solve('/requests/' + str(N) + '/2', 'dispatch', 'closed', ['/a'], '/b', False, '/a'), {'request': '/requests/' + str(N) + '/2', 'decision': ['dispatch', '/a', '/b', ['/a'], 'closed', True, '/a', False, ['/a'], False]})
check('fixture 4', solve('/requests/' + str(N) + '/3', 'response', 'body-error', [], '/x', False, '/x'), {'request': '/requests/' + str(N) + '/3', 'decision': ['response', '/x', '/x', [], 'body-error', True, None, False, [], False]})
check('fixture 5', solve('/requests/' + str(N) + '/4', 'complete', None, ['/a', '/b'], '/b', False, '/a'), {'request': '/requests/' + str(N) + '/4', 'decision': ['complete', '/a', '/b', ['/a', '/b'], 'none', False, '/b', False, ['/a', '/b'], False]})
check('fixture 6', solve('/requests/' + str(N) + '/5', 'policy', 'blocked', [], '/x', True, '/x'), {'request': '/requests/' + str(N) + '/5', 'decision': ['policy', '/x', '/x', [], 'blocked', True, None, True, [], True]})
check('fixture 7', solve('/requests/' + str(N) + '/6', 'parse', 'invalid-target', ['/z', '/a'], 'bad%', False, '/z'), {'request': '/requests/' + str(N) + '/6', 'decision': ['parse', '/z', 'bad%', ['/z', '/a'], 'invalid-target', True, '/a', True, ['/z', '/a'], True]})
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': ['parse', '/a', '/a', ['/a'], 'invalid-target', True, '/a', True, ['/a'], True], 'request': '/requests/1/0'}{'decision': ['parse', '/a', 'bad%', ['/a'], 'invalid-target', True, '/a', True, ['/a'], True], 'request': '/requests/1/0'}Failed
fixture 2{'decision': ['policy', '/a', '/a', ['/a', '/b'], 'blocked', True, '/b', True, ['/a', '/b'], True], 'request': '/requests/1/1'}{'decision': ['policy', '/a', '/c', ['/a', '/b'], 'blocked', True, '/b', True, ['/a', '/b'], True], 'request': '/requests/1/1'}Failed
fixture 3{'decision': ['dispatch', '/a', '/a', ['/a'], 'closed', True, '/a', False, ['/a'], False], 'request': '/requests/1/2'}{'decision': ['dispatch', '/a', '/b', ['/a'], 'closed', True, '/a', False, ['/a'], False], 'request': '/requests/1/2'}Failed
fixture 4{'decision': ['response', '/x', '/x', [], 'body-error', True, None, False, [], False], 'request': '/requests/1/3'}{'decision': ['response', '/x', '/x', [], 'body-error', True, None, False, [], False], 'request': '/requests/1/3'}Passed
fixture 5{'decision': ['complete', '/a', '/a', ['/a', '/b'], 'none', False, '/b', False, ['/a', '/b'], False], 'request': '/requests/1/4'}{'decision': ['complete', '/a', '/b', ['/a', '/b'], 'none', False, '/b', False, ['/a', '/b'], False], 'request': '/requests/1/4'}Failed
fixture 6{'decision': ['policy', '/x', '/x', [], 'blocked', True, None, True, [], True], 'request': '/requests/1/5'}{'decision': ['policy', '/x', '/x', [], 'blocked', True, None, True, [], True], 'request': '/requests/1/5'}Passed
fixture 7{'decision': ['parse', '/z', '/z', ['/z', '/a'], 'invalid-target', True, '/a', True, ['/z', '/a'], True], 'request': '/requests/1/6'}{'decision': ['parse', '/z', 'bad%', ['/z', '/a'], 'invalid-target', True, '/a', True, ['/z', '/a'], True], 'request': '/requests/1/6'}Failed

SHA-256 / 99a7e53c4d022aefb14e833380577f72248fc1a5aa016ee178fab6b0569f85ab

HELD IN THE MEMBER ARCHIVE

The verified repair and its recorded checks are member-only.

This mechanism has 7 recorded checks per implementation. The open-access tier publishes the failure and the unsuccessful fix; the repaired source that passes every check, and the observations that prove it, are available to members.

Every case sharing this mechanism uses the same contract and the same repair, so this one record is held back for all of them.

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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 2026-09-29T14:41:42.235014+00:00.

Case digest / fc629feb57e424cc8fe25cee532240a942f952fb3e0c73edbcc389096d310d61