FA-7646 / WebSocket and browser transport policies / Open access

Sse retry field accepts only nonempty ascii digits · case 01

Sse retry field accepts only nonempty ascii digits.

Verified by executionVariant 1 · 4 checks per implementationDownload source bundle ↓JSON ↗

ROOT CAUSE

The faulty implementation uses `int(value) if value.lstrip("-").isdigit() else None` for the sse-retry-field-accepts-only-nonempty-ascii-digits decision.

VERIFIED REPAIR

Apply the explicit sse-retry-field-accepts-only-nonempty-ascii-digits contract, including the tested boundary and negative cases.

Unsuccessful approach: The attempted repair uses `int(value) if value.isdigit() else None` and still violates a separate fixture.

Case contract

Bounded offline decision model: sse retry field accepts only nonempty ascii digits. Inputs are already validated protocol fields; the explicit fixtures define the supported policy, not a complete protocol implementation.

Why this case matters

This deterministic websocket and browser transport policies model isolates the sse-retry-field-accepts-only-nonempty-ascii-digits policy at a network component boundary.

1 / The failure

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json
import ipaddress
import re
from urllib.parse import urlsplit, urljoin
N = 1
observations = []
def solve(value):
    return int(value) if value.lstrip("-").isdigit() else None
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
_fixtures = ["check('fixture 1', solve('-1'), None)", "check('fixture 2', solve('１２'), None)", "check('fixture 3', solve('100'), 100)", "check('fixture 4', solve(''), None)"]
for _line in _fixtures[N % len(_fixtures):] + _fixtures[:N % len(_fixtures)]:
    exec(_line)
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 2	`12`	`None`	Failed
fixture 3	`100`	`100`	Passed
fixture 4	`None`	`None`	Passed
fixture 1	`-1`	`None`	Failed

SHA-256 / 79635326d56090bed6a402b371ff64b4171114511a7be4eae5766bcb3076d1aa

2 / The unsuccessful fix

Exit 1

"""Failure Map reference implementation. Python standard library only."""
import json
import ipaddress
import re
from urllib.parse import urlsplit, urljoin
N = 1
observations = []
def solve(value):
    return int(value) if value.isdigit() else None
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
_fixtures = ["check('fixture 1', solve('-1'), None)", "check('fixture 2', solve('１２'), None)", "check('fixture 3', solve('100'), 100)", "check('fixture 4', solve(''), None)"]
for _line in _fixtures[N % len(_fixtures):] + _fixtures[:N % len(_fixtures)]:
    exec(_line)
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 2	`12`	`None`	Failed
fixture 3	`100`	`100`	Passed
fixture 4	`None`	`None`	Passed
fixture 1	`None`	`None`	Passed

SHA-256 / fc748562b3a81587abeadebc84a29a5b9640d35428cb4d4620043b4a146006e4

3 / The verified repair

Exit 0

"""Failure Map reference implementation. Python standard library only."""
import json
import ipaddress
import re
from urllib.parse import urlsplit, urljoin
N = 1
observations = []
def solve(value):
    return int(value) if value and all("0" <= c <= "9" for c in value) else None
def check(label, actual, expected):
    observations.append({"check": label, "actual": actual, "expected": expected, "passed": actual == expected})
_fixtures = ["check('fixture 1', solve('-1'), None)", "check('fixture 2', solve('１２'), None)", "check('fixture 3', solve('100'), 100)", "check('fixture 4', solve(''), None)"]
for _line in _fixtures[N % len(_fixtures):] + _fixtures[:N % len(_fixtures)]:
    exec(_line)
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 2	`None`	`None`	Passed
fixture 3	`100`	`100`	Passed
fixture 4	`None`	`None`	Passed
fixture 1	`None`	`None`	Passed

SHA-256 / c08bc99cd6e26880e55fc8c945ba9e75bb36c2888fab9147ad2e67d8397dc9e9

Verification & scope

Bounded deterministic policy model over validated inputs; not a complete protocol stack or an interoperability claim. The five variants rotate the same explicit fixture set. 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 2026-09-29T14:38:14.001950+00:00.

Case digest / e96596ac76463b841cda9602bd55b86c00dd0972ce140dd35dfb012bc858f2cd