FA-26666 / HTTP ranges / Open access
Only outer optional whitespace is accepted around range unit tokens · case 01
Only outer optional whitespace is accepted around range unit tokens.
ROOT CAUSE
The range-unit-whitespace decision uses return "bytes" if "".join(unit.split()).lower()=="bytes" else None.
THE FAILURE
The range-unit-whitespace decision uses return "bytes" if "".join(unit.split()).lower()=="bytes" else None.
Unsuccessful approach: The partial repair uses return "bytes" if unit.lower()=="bytes" else None, which still violates the stated contract.
Case contract
Trim spaces and tabs around unit; return bytes only for exact case-insensitive bytes token afterward, otherwise None. Interior whitespace is invalid.
Why this case matters
Range responses combine representation identity, conditional requests, framing, and partial-object state.
1 / The failure
Exit 1"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(unit):
return "bytes" if "".join(unit.split()).lower()=="bytes" else None
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('range-unit-whitespace fixture 0', solve("by tes"), None)
check('range-unit-whitespace fixture 1', solve(" \tBYTES \t"), "bytes")
check('range-unit-whitespace fixture 2', solve("bytes"), "bytes")
check('range-unit-whitespace fixture 3', solve("items"), None)
check('range-unit-whitespace fixture 4', solve("bytes"+" "*N), "bytes")
check('range-unit-whitespace fixture 5', solve("byte\ns"), None)
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 |
|---|---|---|---|
| range-unit-whitespace fixture 0 | bytes | None | Failed |
| range-unit-whitespace fixture 1 | bytes | bytes | Passed |
| range-unit-whitespace fixture 2 | bytes | bytes | Passed |
| range-unit-whitespace fixture 3 | None | None | Passed |
| range-unit-whitespace fixture 4 | bytes | bytes | Passed |
| range-unit-whitespace fixture 5 | bytes | None | Failed |
SHA-256 / 0b1870a1ddbd785767eb91610647abdc2f0ea873ee06911f4c89a1a25be193e5
2 / The unsuccessful fix
Exit 1"""Failure Map reference implementation. Python standard library only."""
import json
N = 1
observations = []
def solve(unit):
return "bytes" if unit.lower()=="bytes" else None
def check(label, actual, expected):
observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
check('range-unit-whitespace fixture 0', solve("by tes"), None)
check('range-unit-whitespace fixture 1', solve(" \tBYTES \t"), "bytes")
check('range-unit-whitespace fixture 2', solve("bytes"), "bytes")
check('range-unit-whitespace fixture 3', solve("items"), None)
check('range-unit-whitespace fixture 4', solve("bytes"+" "*N), "bytes")
check('range-unit-whitespace fixture 5', solve("byte\ns"), None)
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 |
|---|---|---|---|
| range-unit-whitespace fixture 0 | None | None | Passed |
| range-unit-whitespace fixture 1 | None | bytes | Failed |
| range-unit-whitespace fixture 2 | bytes | bytes | Passed |
| range-unit-whitespace fixture 3 | None | None | Passed |
| range-unit-whitespace fixture 4 | None | bytes | Failed |
| range-unit-whitespace fixture 5 | None | None | Passed |
SHA-256 / e257aae12dd68b137c976675fc61a26156ffc37e4f112d0c75c50d69140bd4aa
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.
Member access is invitation-based. Sign in with your invited account to inspect the repair.
Sign in to the archive ↗Verification & scope
Deterministic simplified range service, with stipulated local policies and already parsed trusted inputs; not a complete HTTP implementation. 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 2026-09-29T14:41:18.114762+00:00.
Case digest / ac0554e1c91bd1c46049fea785d9811c14c02d6f79170ca02a84dfdabaae53fa