FA-28071 / HTTP redirects / Open access
Preserve query-field structure while preparing a redirect target: bare vs empty value · case 01
Preserve query-field structure while preparing a redirect target: the bare vs empty value branch emits an incorrect decision.
ROOT CAUSE
The bare-vs-empty-value decision uses "['value' for p in query.split('&')] if query else []"; this violates the stipulated controller policy.
THE FAILURE
The bare-vs-empty-value decision uses "['value' for p in query.split('&')] if query else []"; this violates the stipulated controller policy.
Unsuccessful approach: The partial repair uses "[('value' if p.partition('=')[2] else 'bare') for p in query.split('&')] if query else []" and still fails an explicit boundary or control.
Case contract
Preserve query-field structure while preparing a redirect 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, query):
return {'request': request, 'decision': [query.split('&') if query else [], ['value' for p in query.split('&')] if query else [], [p.partition('=')[2] for p in query.split('&')] if query else [], query.count('&')+1 if query else 0, query.split('&') if query else []]}
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve('/requests/' + str(N) + '/0', 'a=1&a=1&b'), {'request': '/requests/' + str(N) + '/0', 'decision': [['a=1', 'a=1', 'b'], ['value', 'value', 'bare'], ['1', '1', ''], 3, ['a=1', 'a=1', 'b']]})
check('fixture 2', solve('/requests/' + str(N) + '/1', 'a=&b=x=y=z'), {'request': '/requests/' + str(N) + '/1', 'decision': [['a=', 'b=x=y=z'], ['value', 'value'], ['', 'x=y=z'], 2, ['a=', 'b=x=y=z']]})
check('fixture 3', solve('/requests/' + str(N) + '/2', 'a=x;y=z'), {'request': '/requests/' + str(N) + '/2', 'decision': [['a=x;y=z'], ['value'], ['x;y=z'], 1, ['a=x;y=z']]})
check('fixture 4', solve('/requests/' + str(N) + '/3', 'a=x%26b=y'), {'request': '/requests/' + str(N) + '/3', 'decision': [['a=x%26b=y'], ['value'], ['x%26b=y'], 1, ['a=x%26b=y']]})
check('fixture 5', solve('/requests/' + str(N) + '/4', 'flag'), {'request': '/requests/' + str(N) + '/4', 'decision': [['flag'], ['bare'], [''], 1, ['flag']]})
check('fixture 6', solve('/requests/' + str(N) + '/5', ''), {'request': '/requests/' + str(N) + '/5', 'decision': [[], [], [], 0, []]})
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=1', 'a=1', 'b'], ['value', 'value', 'value'], ['1', '1', ''], 3, ['a=1', 'a=1', 'b']], 'request': '/requests/1/0'} | {'decision': [['a=1', 'a=1', 'b'], ['value', 'value', 'bare'], ['1', '1', ''], 3, ['a=1', 'a=1', 'b']], 'request': '/requests/1/0'} | Failed |
| fixture 2 | {'decision': [['a=', 'b=x=y=z'], ['value', 'value'], ['', 'x=y=z'], 2, ['a=', 'b=x=y=z']], 'request': '/requests/1/1'} | {'decision': [['a=', 'b=x=y=z'], ['value', 'value'], ['', 'x=y=z'], 2, ['a=', 'b=x=y=z']], 'request': '/requests/1/1'} | Passed |
| fixture 3 | {'decision': [['a=x;y=z'], ['value'], ['x;y=z'], 1, ['a=x;y=z']], 'request': '/requests/1/2'} | {'decision': [['a=x;y=z'], ['value'], ['x;y=z'], 1, ['a=x;y=z']], 'request': '/requests/1/2'} | Passed |
| fixture 4 | {'decision': [['a=x%26b=y'], ['value'], ['x%26b=y'], 1, ['a=x%26b=y']], 'request': '/requests/1/3'} | {'decision': [['a=x%26b=y'], ['value'], ['x%26b=y'], 1, ['a=x%26b=y']], 'request': '/requests/1/3'} | Passed |
| fixture 5 | {'decision': [['flag'], ['value'], [''], 1, ['flag']], 'request': '/requests/1/4'} | {'decision': [['flag'], ['bare'], [''], 1, ['flag']], 'request': '/requests/1/4'} | Failed |
| fixture 6 | {'decision': [[], [], [], 0, []], 'request': '/requests/1/5'} | {'decision': [[], [], [], 0, []], 'request': '/requests/1/5'} | Passed |
SHA-256 / 7d98849ed0dc5edd4d76ae570c48f36b92138c7d5d5d798d7a79b92f7c79788f
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, query):
return {'request': request, 'decision': [query.split('&') if query else [], [('value' if p.partition('=')[2] else 'bare') for p in query.split('&')] if query else [], [p.partition('=')[2] for p in query.split('&')] if query else [], query.count('&')+1 if query else 0, query.split('&') if query else []]}
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve('/requests/' + str(N) + '/0', 'a=1&a=1&b'), {'request': '/requests/' + str(N) + '/0', 'decision': [['a=1', 'a=1', 'b'], ['value', 'value', 'bare'], ['1', '1', ''], 3, ['a=1', 'a=1', 'b']]})
check('fixture 2', solve('/requests/' + str(N) + '/1', 'a=&b=x=y=z'), {'request': '/requests/' + str(N) + '/1', 'decision': [['a=', 'b=x=y=z'], ['value', 'value'], ['', 'x=y=z'], 2, ['a=', 'b=x=y=z']]})
check('fixture 3', solve('/requests/' + str(N) + '/2', 'a=x;y=z'), {'request': '/requests/' + str(N) + '/2', 'decision': [['a=x;y=z'], ['value'], ['x;y=z'], 1, ['a=x;y=z']]})
check('fixture 4', solve('/requests/' + str(N) + '/3', 'a=x%26b=y'), {'request': '/requests/' + str(N) + '/3', 'decision': [['a=x%26b=y'], ['value'], ['x%26b=y'], 1, ['a=x%26b=y']]})
check('fixture 5', solve('/requests/' + str(N) + '/4', 'flag'), {'request': '/requests/' + str(N) + '/4', 'decision': [['flag'], ['bare'], [''], 1, ['flag']]})
check('fixture 6', solve('/requests/' + str(N) + '/5', ''), {'request': '/requests/' + str(N) + '/5', 'decision': [[], [], [], 0, []]})
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=1', 'a=1', 'b'], ['value', 'value', 'bare'], ['1', '1', ''], 3, ['a=1', 'a=1', 'b']], 'request': '/requests/1/0'} | {'decision': [['a=1', 'a=1', 'b'], ['value', 'value', 'bare'], ['1', '1', ''], 3, ['a=1', 'a=1', 'b']], 'request': '/requests/1/0'} | Passed |
| fixture 2 | {'decision': [['a=', 'b=x=y=z'], ['bare', 'value'], ['', 'x=y=z'], 2, ['a=', 'b=x=y=z']], 'request': '/requests/1/1'} | {'decision': [['a=', 'b=x=y=z'], ['value', 'value'], ['', 'x=y=z'], 2, ['a=', 'b=x=y=z']], 'request': '/requests/1/1'} | Failed |
| fixture 3 | {'decision': [['a=x;y=z'], ['value'], ['x;y=z'], 1, ['a=x;y=z']], 'request': '/requests/1/2'} | {'decision': [['a=x;y=z'], ['value'], ['x;y=z'], 1, ['a=x;y=z']], 'request': '/requests/1/2'} | Passed |
| fixture 4 | {'decision': [['a=x%26b=y'], ['value'], ['x%26b=y'], 1, ['a=x%26b=y']], 'request': '/requests/1/3'} | {'decision': [['a=x%26b=y'], ['value'], ['x%26b=y'], 1, ['a=x%26b=y']], 'request': '/requests/1/3'} | Passed |
| fixture 5 | {'decision': [['flag'], ['bare'], [''], 1, ['flag']], 'request': '/requests/1/4'} | {'decision': [['flag'], ['bare'], [''], 1, ['flag']], 'request': '/requests/1/4'} | Passed |
| fixture 6 | {'decision': [[], [], [], 0, []], 'request': '/requests/1/5'} | {'decision': [[], [], [], 0, []], 'request': '/requests/1/5'} | Passed |
SHA-256 / 83011abe142f8a90de6a65073ec6e14137f9dbfd3015cc26c1bb40189e205740
HELD IN THE MEMBER ARCHIVE
The verified repair and its recorded checks are member-only.
This mechanism has 6 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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Sign in to the archive ↗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 2026-09-29T14:41:30.812183+00:00.
Case digest / 16ec9adc7f928de91c98bae8679b465b263be975c1d3e8efd8124dfbbd261b7c