FA-28171 / HTTP redirects / Open access
Release an intermediate response before following its target: idempotent close · case 01
Release an intermediate response before following its target: the idempotent close branch emits an incorrect decision.
ROOT CAUSE
The idempotent-close decision uses 'True'; this violates the stipulated controller policy.
VERIFIED REPAIR
At this decision use 'not closed', preserving the other controller outputs.
Unsuccessful approach: The partial repair uses 'not drained' 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', True, 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 fixture | Actual | Expected | Outcome |
|---|---|---|---|
| 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', True, 0, 'stream', 'released'], 'request': '/requests/1/4'} | {'decision': [False, False, False, False, False, 'eof', False, 0, 'stream', 'released'], 'request': '/requests/1/4'} | Failed |
| fixture 6 | {'decision': [False, False, False, False, False, 'eof', True, 0, 'connection', 'released'], 'request': '/requests/1/5'} | {'decision': [False, False, False, False, False, 'eof', False, 0, 'connection', 'released'], 'request': '/requests/1/5'} | Failed |
SHA-256 / a0a2ae4b77bffc31c96bde945ae96cd946abfed2a0f944cc4125df1caa53e836
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 drained, 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 fixture | Actual | Expected | Outcome |
|---|---|---|---|
| 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', False, 0, 'connection', 'owned'], 'request': '/requests/1/1'} | {'decision': [False, True, False, False, True, 'eof', True, 0, 'connection', 'owned'], 'request': '/requests/1/1'} | Failed |
| 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', True, 0, 'connection', 'released'], 'request': '/requests/1/5'} | {'decision': [False, False, False, False, False, 'eof', False, 0, 'connection', 'released'], 'request': '/requests/1/5'} | Failed |
SHA-256 / 1946daea12e259f78bbce09afd47464b30b5ebb42f4df716d1622ae66d178871
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 fixture | Actual | Expected | Outcome |
|---|---|---|---|
| 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 2026-09-29T14:41:31.546698+00:00.
Case digest / e238ecde0b25a6a42798cd2caf109e016d42bd3b2e01d10453cfdd3caa6910d1