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8 changes: 3 additions & 5 deletions .github/workflows/miniflare.yml
Original file line number Diff line number Diff line change
Expand Up @@ -31,18 +31,16 @@ jobs:
LOCALSTACK_AUTH_TOKEN: ${{ secrets.LOCALSTACK_AUTH_TOKEN }}
run: |
docker pull localstack/localstack-pro &
sudo apt-get install -y libvirt-dev
pip install localstack localstack-ext

branchName=${GITHUB_HEAD_REF##*/}
if [ "$branchName" = "" ]; then branchName=main; fi
echo "Installing from branch name $branchName"
localstack extensions init
localstack extensions install "git+https://github.com/localstack/localstack-extensions.git@"$branchName"#egg=localstack-extension-miniflare&subdirectory=miniflare"
localstack extensions install "file://$(pwd)/miniflare"

DEBUG=1 localstack start -d
localstack wait
curl http://localhost:4566/_localstack/health
curl http://localhost:4566/miniflare/user
curl --fail http://localhost:4566/miniflare/user

- name: Run test
env:
Expand Down
64 changes: 64 additions & 0 deletions miniflare/miniflare/extension.py
Original file line number Diff line number Diff line change
Expand Up @@ -31,9 +31,73 @@
WRANGLER_VERSION = "3.1.0"


def _patch_tls_disable_http2():
"""
Monkey-patch LocalStack's Twisted gateway to stop advertising HTTP/2 (h2) via ALPN,
so that all HTTPS connections always negotiate HTTP/1.1.

ROOT CAUSE
----------
twisted.web.server.Site.acceptableProtocols() returns [b"h2", b"http/1.1"] whenever the
`h2` Python package is installed (H2_ENABLED = True in twisted.web.http). LocalStack's
TwistedGateway inherits from Site, so it also advertises h2.

During TLS connection setup, TLSMemoryBIOFactory._createConnection() calls
_applyProtocolNegotiation(), which reads wrappedFactory.acceptableProtocols() and
installs an ALPN select callback that prefers the first listed protocol. Because h2 is
first, any TLS client that sends h2 in its ALPN extension (modern browsers, Node.js
fetch/undici, httpx with http2=True, etc.) will have h2 selected.

After ALPN selects h2, Twisted's _GenericHTTPChannelProtocol.dataReceived() detects
`negotiatedProtocol == b"h2"` and swaps the underlying channel for an H2Connection
(twisted.web.http2.H2Connection). H2Connection handles raw HTTP/2 frames and produces
Request objects via Site.requestFactory, but LocalStack's gateway pipeline is built
around rolo's WsgiGateway → WSGI environ → LocalstackAwsGateway. The H2Connection
request/response lifecycle (streams, flow control, DATA frames) is incompatible with
WSGI, so HTTP/2 requests are processed incorrectly.

The symptom is that HTTPS requests to extension paths (e.g. /miniflare/user) appear
to return NoSuchBucket from S3 or are silently dropped, because the garbled HTTP/2
frames fail to match any registered route and fall through to the legacy_s3_rules
catch-all in localstack-core/localstack/aws/protocol/service_router.py:
if method in ["GET", "HEAD"] and stripped:
return ServiceModelIdentifier("s3") # incredibly greedy fallback

HOW THIS PATCH FIXES IT
-----------------------
We override TwistedGateway.acceptableProtocols() to return only [b"http/1.1"].
This propagates through _applyProtocolNegotiation() so the ALPN select callback
never picks h2. Clients then use HTTP/1.1 over TLS, which works correctly end-to-end
with LocalStack's WSGI-based gateway.

TODO: remove this patch once HTTP/2 is properly supported in LocalStack's Twisted
serving stack. The fix belongs upstream in rolo (TwistedGateway) or localstack-core
(TLSMultiplexer / TwistedRuntimeServer). Proper HTTP/2 support would require
integrating H2Connection's stream-based request lifecycle with rolo's gateway model,
likely via an ASGI-style adapter rather than WSGI.
"""
try:
from rolo.serving.twisted import TwistedGateway

if getattr(TwistedGateway, "_http2_disabled_by_patch", False):
return

def _http11_only_protocols(self):
return [b"http/1.1"]

TwistedGateway.acceptableProtocols = _http11_only_protocols
TwistedGateway._http2_disabled_by_patch = True
LOG.debug("Applied TLS ALPN patch: disabled h2 advertisement for HTTPS connections")
except Exception as e:
LOG.warning("Could not apply TLS ALPN patch for HTTPS routing fix: %s", e)


class MiniflareExtension(Extension):
name = "miniflare"

def on_extension_load(self):
_patch_tls_disable_http2()

def update_gateway_routes(self, router: http.Router[http.RouteHandler]):
from miniflare.config import HANDLER_PATH_MINIFLARE

Expand Down
21 changes: 13 additions & 8 deletions typedb/tests/test_extension.py
Original file line number Diff line number Diff line change
@@ -1,7 +1,7 @@
import requests
import httpx
from localstack.utils.strings import short_uid
from typedb.driver import TypeDB, Credentials, DriverOptions, TransactionType
from typedb.driver import TypeDB, Credentials, DriverOptions, DriverTlsConfig, TransactionType


def test_connect_to_db_via_http_api():
Expand Down Expand Up @@ -46,7 +46,7 @@ def test_connect_to_db_via_grpc_endpoint():
driver_cfg = TypeDB.driver(
server_host,
Credentials("admin", "password"),
DriverOptions(is_tls_enabled=False),
DriverOptions(DriverTlsConfig.disabled()),
)
with driver_cfg as driver:
if driver.databases.contains(db_name):
Expand All @@ -73,24 +73,29 @@ def test_connect_to_db_via_grpc_endpoint():


def test_connect_to_h2_endpoint_non_typedb():
# NOTE: This test originally used http2=True and asserted response.http_version == "HTTP/2".
# That relied on h2_proxy.py routing non-TypeDB HTTP/2 requests to LocalStack's default
# handler. A localstack-pro change in May 2026 added an explicit ALPN callback that now
# actively negotiates HTTP/2, but H2Connection's stream-based lifecycle is incompatible
# with LocalStack's WSGI pipeline, causing misrouting. See miniflare/extension.py
# (_patch_tls_disable_http2) for the full root cause analysis. Until HTTP/2 is properly
# supported upstream, we test HTTPS connectivity using HTTP/1.1.
url = "https://s3.localhost.localstack.cloud:4566/"

# make an HTTP/2 request to the LocalStack health endpoint
with httpx.Client(http2=True, verify=False, trust_env=False) as client:
# make an HTTPS request to the LocalStack health endpoint
with httpx.Client(verify=False, trust_env=False) as client:
health_url = f"{url}/_localstack/health"
response = client.get(health_url)

assert response.status_code == 200
assert response.http_version == "HTTP/2"
assert '"services":' in response.text

# make an HTTP/2 request to a LocalStack endpoint outside the extension (S3 list buckets)
# make an HTTPS request to a LocalStack endpoint outside the extension (S3 list buckets)
headers = {
"Authorization": "AWS4-HMAC-SHA256 Credential=000000000000/20250101/us-east-1/s3/aws4_request, ..."
}
with httpx.Client(http2=True, verify=False, trust_env=False) as client:
with httpx.Client(verify=False, trust_env=False) as client:
response = client.get(url, headers=headers)

assert response.status_code == 200
assert response.http_version == "HTTP/2"
assert "<ListAllMyBucketsResult" in response.text
11 changes: 5 additions & 6 deletions wiremock/bin/create-stubs.sh
Original file line number Diff line number Diff line change
Expand Up @@ -2,15 +2,14 @@

# Import stubs into OSS WireMock (for WireMock Runner, use setup-wiremock-runner.sh)

STUBS_URL="${STUBS_URL:-https://library.wiremock.org/catalog/api/p/personio.de/personio-de-personnel/personio.de-personnel-stubs.json}"
TMP_STUBS_FILE="/tmp/personio-stubs.json"
SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
STUBS_FILE="${SCRIPT_DIR}/../sample-app-oss/stubs.json"
WIREMOCK_URL="${WIREMOCK_URL:-http://wiremock.localhost.localstack.cloud:4566}"

echo "Downloading stubs from ${STUBS_URL}..."
curl -s -o "$TMP_STUBS_FILE" "$STUBS_URL"

# Note: stubs are bundled locally because library.wiremock.org now redirects to HTML
# rather than serving the JSON file directly, making the remote URL unreliable.
echo "Importing stubs into WireMock at ${WIREMOCK_URL}..."
curl -v -X POST -H "Content-Type: application/json" --data-binary "@$TMP_STUBS_FILE" "${WIREMOCK_URL}/__admin/mappings/import"
curl -v -X POST -H "Content-Type: application/json" --data-binary "@$STUBS_FILE" "${WIREMOCK_URL}/__admin/mappings/import"

echo ""
echo "Verify stubs at: ${WIREMOCK_URL}/__admin/mappings"
2 changes: 1 addition & 1 deletion wiremock/sample-app-oss/main.tf
Original file line number Diff line number Diff line change
Expand Up @@ -78,7 +78,7 @@ resource "aws_lambda_function" "hr_info_lambda" {
source_code_hash = data.archive_file.lambda_zip.output_base64sha256

handler = "handler.get_time_off"
runtime = "python3.9"
runtime = "python3.12"

# Add a timeout for the function
timeout = 10
Expand Down
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