async def test_retries_enabled(server: Server) -> None:
"""
When retries are enabled, connection failures are retried on with
a fixed exponential backoff.
"""
method = b"GET"
url = (b"http", *server.netloc, b"/")
headers = [server.host_header]
backend = AsyncMockBackend()
retries = 10 # Large enough to not run out of retries within this test.
async with httpcore.AsyncConnectionPool(retries=retries,
max_keepalive_connections=0,
backend=backend) as http:
# Standard case, no failures.
response = await http.arequest(method, url, headers)
assert backend.pop_open_tcp_stream_intervals() == []
status_code, _, stream, _ = response
assert status_code == 200
await read_body(stream)
# One failure, then success.
backend.push(httpcore.ConnectError(), None)
response = await http.arequest(method, url, headers)
assert backend.pop_open_tcp_stream_intervals() == [
pytest.approx(0, abs=1e-3), # Retry immediately.
]
status_code, _, stream, _ = response
assert status_code == 200
await read_body(stream)
# Three failures, then success.
backend.push(
httpcore.ConnectError(),
httpcore.ConnectTimeout(),
httpcore.ConnectTimeout(),
None,
)
response = await http.arequest(method, url, headers)
assert backend.pop_open_tcp_stream_intervals() == [
pytest.approx(0, abs=1e-3), # Retry immediately.
pytest.approx(0.5, rel=0.1), # First backoff.
pytest.approx(1.0, rel=0.1), # Second (increased) backoff.
]
status_code, _, stream, _ = response
assert status_code == 200
await read_body(stream)
# Non-connect exceptions are not retried on.
backend.push(httpcore.ReadTimeout(), httpcore.NetworkError())
with pytest.raises(httpcore.ReadTimeout):
await http.arequest(method, url, headers)
with pytest.raises(httpcore.NetworkError):
await http.arequest(method, url, headers)
def __iter__(self):
raise httpcore.ReadTimeout()