FA-28816 / HTTP redirects / Open access
Apply post-redirect fragment navigation without altering request routing: text directive routing · case 01
Apply post-redirect fragment navigation without altering request routing: the text directive routing branch emits an incorrect decision.
ROOT CAUSE
The text-directive-routing decision uses 'fragment.startswith(":~:")'; this violates the stipulated controller policy.
VERIFIED REPAIR
At this decision use 'directive and fragment.startswith(":~:")', preserving the other controller outputs.
Unsuccessful approach: The partial repair uses 'directive or bool(fragment)' and still fails an explicit boundary or control.
Case contract
Apply post-redirect fragment navigation without altering request routing. 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, fragment, ids, saved_scroll, restore, decoded, directive):
return {'request': request, 'decision': [next((i for i,v in enumerate(ids) if v==fragment),None), unquote(fragment) if decoded else fragment, restore, saved_scroll if restore else 0, fragment == '', fragment.startswith(":~:"), '', (unquote(fragment) if decoded else fragment) in ids, saved_scroll if fragment not in ids else 0, None if directive else fragment]}
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve('/requests/' + str(N) + '/0', 'section', ['top', 'section', 'section'], 25, False, True, False), {'request': '/requests/' + str(N) + '/0', 'decision': [1, 'section', False, 0, False, False, '', True, 0, 'section']})
check('fixture 2', solve('/requests/' + str(N) + '/1', 'a%20b', ['a b', 'a%20b'], 40, False, True, False), {'request': '/requests/' + str(N) + '/1', 'decision': [1, 'a b', False, 0, False, False, '', True, 0, 'a%20b']})
check('fixture 3', solve('/requests/' + str(N) + '/2', 'missing', ['top'], 15, True, False, False), {'request': '/requests/' + str(N) + '/2', 'decision': [None, 'missing', True, 15, False, False, '', False, 15, 'missing']})
check('fixture 4', solve('/requests/' + str(N) + '/3', '', [], 0, False, True, False), {'request': '/requests/' + str(N) + '/3', 'decision': [None, '', False, 0, True, False, '', False, 0, '']})
check('fixture 5', solve('/requests/' + str(N) + '/4', 'top', ['x', 'top'], 80, False, False, False), {'request': '/requests/' + str(N) + '/4', 'decision': [1, 'top', False, 0, False, False, '', True, 0, 'top']})
check('fixture 6', solve('/requests/' + str(N) + '/5', ':~:text=hello', [':~:text=hello'], 5, False, False, True), {'request': '/requests/' + str(N) + '/5', 'decision': [0, ':~:text=hello', False, 0, False, True, '', True, 0, None]})
check('fixture 7', solve('/requests/' + str(N) + '/6', 'a%20b', ['a b'], 5, False, True, False), {'request': '/requests/' + str(N) + '/6', 'decision': [None, 'a b', False, 0, False, False, '', True, 5, 'a%20b']})
check('fixture 8', solve('/requests/' + str(N) + '/7', 'x%20y', [], 6, False, False, False), {'request': '/requests/' + str(N) + '/7', 'decision': [None, 'x%20y', False, 0, False, False, '', False, 6, 'x%20y']})
check('fixture 9', solve('/requests/' + str(N) + '/8', ':~:text=no', [], 8, False, False, False), {'request': '/requests/' + str(N) + '/8', 'decision': [None, ':~:text=no', False, 0, False, False, '', False, 8, ':~:text=no']})
check('fixture 10', solve('/requests/' + str(N) + '/9', '', ['top'], 9, False, False, False), {'request': '/requests/' + str(N) + '/9', 'decision': [None, '', False, 0, True, False, '', False, 9, '']})
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': [1, 'section', False, 0, False, False, '', True, 0, 'section'], 'request': '/requests/1/0'} | {'decision': [1, 'section', False, 0, False, False, '', True, 0, 'section'], 'request': '/requests/1/0'} | Passed |
| fixture 2 | {'decision': [1, 'a b', False, 0, False, False, '', True, 0, 'a%20b'], 'request': '/requests/1/1'} | {'decision': [1, 'a b', False, 0, False, False, '', True, 0, 'a%20b'], 'request': '/requests/1/1'} | Passed |
| fixture 3 | {'decision': [None, 'missing', True, 15, False, False, '', False, 15, 'missing'], 'request': '/requests/1/2'} | {'decision': [None, 'missing', True, 15, False, False, '', False, 15, 'missing'], 'request': '/requests/1/2'} | Passed |
| fixture 4 | {'decision': [None, '', False, 0, True, False, '', False, 0, ''], 'request': '/requests/1/3'} | {'decision': [None, '', False, 0, True, False, '', False, 0, ''], 'request': '/requests/1/3'} | Passed |
| fixture 5 | {'decision': [1, 'top', False, 0, False, False, '', True, 0, 'top'], 'request': '/requests/1/4'} | {'decision': [1, 'top', False, 0, False, False, '', True, 0, 'top'], 'request': '/requests/1/4'} | Passed |
| fixture 6 | {'decision': [0, ':~:text=hello', False, 0, False, True, '', True, 0, None], 'request': '/requests/1/5'} | {'decision': [0, ':~:text=hello', False, 0, False, True, '', True, 0, None], 'request': '/requests/1/5'} | Passed |
| fixture 7 | {'decision': [None, 'a b', False, 0, False, False, '', True, 5, 'a%20b'], 'request': '/requests/1/6'} | {'decision': [None, 'a b', False, 0, False, False, '', True, 5, 'a%20b'], 'request': '/requests/1/6'} | Passed |
| fixture 8 | {'decision': [None, 'x%20y', False, 0, False, False, '', False, 6, 'x%20y'], 'request': '/requests/1/7'} | {'decision': [None, 'x%20y', False, 0, False, False, '', False, 6, 'x%20y'], 'request': '/requests/1/7'} | Passed |
| fixture 9 | {'decision': [None, ':~:text=no', False, 0, False, True, '', False, 8, ':~:text=no'], 'request': '/requests/1/8'} | {'decision': [None, ':~:text=no', False, 0, False, False, '', False, 8, ':~:text=no'], 'request': '/requests/1/8'} | Failed |
| fixture 10 | {'decision': [None, '', False, 0, True, False, '', False, 9, ''], 'request': '/requests/1/9'} | {'decision': [None, '', False, 0, True, False, '', False, 9, ''], 'request': '/requests/1/9'} | Passed |
SHA-256 / 2f346f4a5eee644c634a335488d46312df5e113b63ac46351aba259c7a4988f2
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, fragment, ids, saved_scroll, restore, decoded, directive):
return {'request': request, 'decision': [next((i for i,v in enumerate(ids) if v==fragment),None), unquote(fragment) if decoded else fragment, restore, saved_scroll if restore else 0, fragment == '', directive or bool(fragment), '', (unquote(fragment) if decoded else fragment) in ids, saved_scroll if fragment not in ids else 0, None if directive else fragment]}
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve('/requests/' + str(N) + '/0', 'section', ['top', 'section', 'section'], 25, False, True, False), {'request': '/requests/' + str(N) + '/0', 'decision': [1, 'section', False, 0, False, False, '', True, 0, 'section']})
check('fixture 2', solve('/requests/' + str(N) + '/1', 'a%20b', ['a b', 'a%20b'], 40, False, True, False), {'request': '/requests/' + str(N) + '/1', 'decision': [1, 'a b', False, 0, False, False, '', True, 0, 'a%20b']})
check('fixture 3', solve('/requests/' + str(N) + '/2', 'missing', ['top'], 15, True, False, False), {'request': '/requests/' + str(N) + '/2', 'decision': [None, 'missing', True, 15, False, False, '', False, 15, 'missing']})
check('fixture 4', solve('/requests/' + str(N) + '/3', '', [], 0, False, True, False), {'request': '/requests/' + str(N) + '/3', 'decision': [None, '', False, 0, True, False, '', False, 0, '']})
check('fixture 5', solve('/requests/' + str(N) + '/4', 'top', ['x', 'top'], 80, False, False, False), {'request': '/requests/' + str(N) + '/4', 'decision': [1, 'top', False, 0, False, False, '', True, 0, 'top']})
check('fixture 6', solve('/requests/' + str(N) + '/5', ':~:text=hello', [':~:text=hello'], 5, False, False, True), {'request': '/requests/' + str(N) + '/5', 'decision': [0, ':~:text=hello', False, 0, False, True, '', True, 0, None]})
check('fixture 7', solve('/requests/' + str(N) + '/6', 'a%20b', ['a b'], 5, False, True, False), {'request': '/requests/' + str(N) + '/6', 'decision': [None, 'a b', False, 0, False, False, '', True, 5, 'a%20b']})
check('fixture 8', solve('/requests/' + str(N) + '/7', 'x%20y', [], 6, False, False, False), {'request': '/requests/' + str(N) + '/7', 'decision': [None, 'x%20y', False, 0, False, False, '', False, 6, 'x%20y']})
check('fixture 9', solve('/requests/' + str(N) + '/8', ':~:text=no', [], 8, False, False, False), {'request': '/requests/' + str(N) + '/8', 'decision': [None, ':~:text=no', False, 0, False, False, '', False, 8, ':~:text=no']})
check('fixture 10', solve('/requests/' + str(N) + '/9', '', ['top'], 9, False, False, False), {'request': '/requests/' + str(N) + '/9', 'decision': [None, '', False, 0, True, False, '', False, 9, '']})
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': [1, 'section', False, 0, False, True, '', True, 0, 'section'], 'request': '/requests/1/0'} | {'decision': [1, 'section', False, 0, False, False, '', True, 0, 'section'], 'request': '/requests/1/0'} | Failed |
| fixture 2 | {'decision': [1, 'a b', False, 0, False, True, '', True, 0, 'a%20b'], 'request': '/requests/1/1'} | {'decision': [1, 'a b', False, 0, False, False, '', True, 0, 'a%20b'], 'request': '/requests/1/1'} | Failed |
| fixture 3 | {'decision': [None, 'missing', True, 15, False, True, '', False, 15, 'missing'], 'request': '/requests/1/2'} | {'decision': [None, 'missing', True, 15, False, False, '', False, 15, 'missing'], 'request': '/requests/1/2'} | Failed |
| fixture 4 | {'decision': [None, '', False, 0, True, False, '', False, 0, ''], 'request': '/requests/1/3'} | {'decision': [None, '', False, 0, True, False, '', False, 0, ''], 'request': '/requests/1/3'} | Passed |
| fixture 5 | {'decision': [1, 'top', False, 0, False, True, '', True, 0, 'top'], 'request': '/requests/1/4'} | {'decision': [1, 'top', False, 0, False, False, '', True, 0, 'top'], 'request': '/requests/1/4'} | Failed |
| fixture 6 | {'decision': [0, ':~:text=hello', False, 0, False, True, '', True, 0, None], 'request': '/requests/1/5'} | {'decision': [0, ':~:text=hello', False, 0, False, True, '', True, 0, None], 'request': '/requests/1/5'} | Passed |
| fixture 7 | {'decision': [None, 'a b', False, 0, False, True, '', True, 5, 'a%20b'], 'request': '/requests/1/6'} | {'decision': [None, 'a b', False, 0, False, False, '', True, 5, 'a%20b'], 'request': '/requests/1/6'} | Failed |
| fixture 8 | {'decision': [None, 'x%20y', False, 0, False, True, '', False, 6, 'x%20y'], 'request': '/requests/1/7'} | {'decision': [None, 'x%20y', False, 0, False, False, '', False, 6, 'x%20y'], 'request': '/requests/1/7'} | Failed |
| fixture 9 | {'decision': [None, ':~:text=no', False, 0, False, True, '', False, 8, ':~:text=no'], 'request': '/requests/1/8'} | {'decision': [None, ':~:text=no', False, 0, False, False, '', False, 8, ':~:text=no'], 'request': '/requests/1/8'} | Failed |
| fixture 10 | {'decision': [None, '', False, 0, True, False, '', False, 9, ''], 'request': '/requests/1/9'} | {'decision': [None, '', False, 0, True, False, '', False, 9, ''], 'request': '/requests/1/9'} | Passed |
SHA-256 / ffd5dc837e4abedb32a6f45c2faf19963f63e8f1f0ae86289a41ea5e1394aada
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, fragment, ids, saved_scroll, restore, decoded, directive):
return {'request': request, 'decision': [next((i for i,v in enumerate(ids) if v==fragment),None), unquote(fragment) if decoded else fragment, restore, saved_scroll if restore else 0, fragment == '', directive and fragment.startswith(":~:"), '', (unquote(fragment) if decoded else fragment) in ids, saved_scroll if fragment not in ids else 0, None if directive else fragment]}
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('fixture 1', solve('/requests/' + str(N) + '/0', 'section', ['top', 'section', 'section'], 25, False, True, False), {'request': '/requests/' + str(N) + '/0', 'decision': [1, 'section', False, 0, False, False, '', True, 0, 'section']})
check('fixture 2', solve('/requests/' + str(N) + '/1', 'a%20b', ['a b', 'a%20b'], 40, False, True, False), {'request': '/requests/' + str(N) + '/1', 'decision': [1, 'a b', False, 0, False, False, '', True, 0, 'a%20b']})
check('fixture 3', solve('/requests/' + str(N) + '/2', 'missing', ['top'], 15, True, False, False), {'request': '/requests/' + str(N) + '/2', 'decision': [None, 'missing', True, 15, False, False, '', False, 15, 'missing']})
check('fixture 4', solve('/requests/' + str(N) + '/3', '', [], 0, False, True, False), {'request': '/requests/' + str(N) + '/3', 'decision': [None, '', False, 0, True, False, '', False, 0, '']})
check('fixture 5', solve('/requests/' + str(N) + '/4', 'top', ['x', 'top'], 80, False, False, False), {'request': '/requests/' + str(N) + '/4', 'decision': [1, 'top', False, 0, False, False, '', True, 0, 'top']})
check('fixture 6', solve('/requests/' + str(N) + '/5', ':~:text=hello', [':~:text=hello'], 5, False, False, True), {'request': '/requests/' + str(N) + '/5', 'decision': [0, ':~:text=hello', False, 0, False, True, '', True, 0, None]})
check('fixture 7', solve('/requests/' + str(N) + '/6', 'a%20b', ['a b'], 5, False, True, False), {'request': '/requests/' + str(N) + '/6', 'decision': [None, 'a b', False, 0, False, False, '', True, 5, 'a%20b']})
check('fixture 8', solve('/requests/' + str(N) + '/7', 'x%20y', [], 6, False, False, False), {'request': '/requests/' + str(N) + '/7', 'decision': [None, 'x%20y', False, 0, False, False, '', False, 6, 'x%20y']})
check('fixture 9', solve('/requests/' + str(N) + '/8', ':~:text=no', [], 8, False, False, False), {'request': '/requests/' + str(N) + '/8', 'decision': [None, ':~:text=no', False, 0, False, False, '', False, 8, ':~:text=no']})
check('fixture 10', solve('/requests/' + str(N) + '/9', '', ['top'], 9, False, False, False), {'request': '/requests/' + str(N) + '/9', 'decision': [None, '', False, 0, True, False, '', False, 9, '']})
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': [1, 'section', False, 0, False, False, '', True, 0, 'section'], 'request': '/requests/1/0'} | {'decision': [1, 'section', False, 0, False, False, '', True, 0, 'section'], 'request': '/requests/1/0'} | Passed |
| fixture 2 | {'decision': [1, 'a b', False, 0, False, False, '', True, 0, 'a%20b'], 'request': '/requests/1/1'} | {'decision': [1, 'a b', False, 0, False, False, '', True, 0, 'a%20b'], 'request': '/requests/1/1'} | Passed |
| fixture 3 | {'decision': [None, 'missing', True, 15, False, False, '', False, 15, 'missing'], 'request': '/requests/1/2'} | {'decision': [None, 'missing', True, 15, False, False, '', False, 15, 'missing'], 'request': '/requests/1/2'} | Passed |
| fixture 4 | {'decision': [None, '', False, 0, True, False, '', False, 0, ''], 'request': '/requests/1/3'} | {'decision': [None, '', False, 0, True, False, '', False, 0, ''], 'request': '/requests/1/3'} | Passed |
| fixture 5 | {'decision': [1, 'top', False, 0, False, False, '', True, 0, 'top'], 'request': '/requests/1/4'} | {'decision': [1, 'top', False, 0, False, False, '', True, 0, 'top'], 'request': '/requests/1/4'} | Passed |
| fixture 6 | {'decision': [0, ':~:text=hello', False, 0, False, True, '', True, 0, None], 'request': '/requests/1/5'} | {'decision': [0, ':~:text=hello', False, 0, False, True, '', True, 0, None], 'request': '/requests/1/5'} | Passed |
| fixture 7 | {'decision': [None, 'a b', False, 0, False, False, '', True, 5, 'a%20b'], 'request': '/requests/1/6'} | {'decision': [None, 'a b', False, 0, False, False, '', True, 5, 'a%20b'], 'request': '/requests/1/6'} | Passed |
| fixture 8 | {'decision': [None, 'x%20y', False, 0, False, False, '', False, 6, 'x%20y'], 'request': '/requests/1/7'} | {'decision': [None, 'x%20y', False, 0, False, False, '', False, 6, 'x%20y'], 'request': '/requests/1/7'} | Passed |
| fixture 9 | {'decision': [None, ':~:text=no', False, 0, False, False, '', False, 8, ':~:text=no'], 'request': '/requests/1/8'} | {'decision': [None, ':~:text=no', False, 0, False, False, '', False, 8, ':~:text=no'], 'request': '/requests/1/8'} | Passed |
| fixture 10 | {'decision': [None, '', False, 0, True, False, '', False, 9, ''], 'request': '/requests/1/9'} | {'decision': [None, '', False, 0, True, False, '', False, 9, ''], 'request': '/requests/1/9'} | Passed |
SHA-256 / 39ae446f68cbad868a78946d6281bf497fd30a16480f52194b2e54b2ba77b2aa
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 2026-09-29T14:41:37.295892+00:00.
Case digest / f71d2967e2479035a3a2bcb6bb73213cd9c4d99a37891b855923a3eb0f53ac18