Bug: file descriptor leak in HttpWaitStrategy

[loic-simon]

Describe the bug

When using an HttpWaitStrategy in DockerContainer.waiting_for and the container image respond with an error code, the underlying HttpError is not correctly handled, leaking a file descriptor.

To Reproduce

Example with the https://hub.docker.com/r/typesense/typesense image, but should work with any image providing a HTTP server that takes a few seconds to start:

# mre.py
from testcontainers.core.container import DockerContainer
from testcontainers.core.wait_strategies import HttpWaitStrategy

print("starting")
with (
    DockerContainer("typesense/typesense:30.2", command="--data-dir /home --api-key=whatever --enable-cors")
    .with_exposed_ports(8108)
    .waiting_for(HttpWaitStrategy(8108, "/health").for_status_code(200))
):
    print("ok")

$ python -Werror::ResourceWarning mre.py
starting
Exception ignored while calling deallocator <function _TemporaryFileCloser.__del__ at 0x101984880>:
Traceback (most recent call last):
  File "/Users/loic/.local/share/uv/python/cpython-3.14.4-macos-aarch64-none/lib/python3.14/tempfile.py", line 484, in __del__
    _warnings.warn(self.warn_message, ResourceWarning)
ResourceWarning: Implicitly cleaning up <HTTPError 503: ''>
ok

Root Cause / fix

The issue is in

testcontainers-python/src/testcontainers/core/wait_strategies.py

Lines 428 to 437 in 5c70d54

	def _handle_http_error(self, error: Union[URLError, HTTPError]) -> bool:
	"""Handle HTTP errors and return True if error is acceptable."""
	if isinstance(error, HTTPError) and (
	error.code in self._status_codes
	or (self._status_code_predicate and self._status_code_predicate(error.code))
	):
	return True
	logger.debug(f"HTTP request failed: {error!s}")
	return False

HttpError holds a reference to a (temporary) file storing the HTTP response, so it must be handled in a context manager to safely clean the file when the error is discarded.

Fixed MRE:

# mre.py
from contextlib import nullcontext
from typing import Union
from urllib.error import HTTPError, URLError

from testcontainers.core.container import DockerContainer
from testcontainers.core.wait_strategies import HttpWaitStrategy

class _FixedHttpWaitStrategy(HttpWaitStrategy):
    def _handle_http_error(self, error: Union[URLError, HTTPError]) -> bool:
        with error if isinstance(error, HTTPError) else nullcontext(error):
            return super()._handle_http_error(error)

print("starting")
with (
    DockerContainer("typesense/typesense:30.2", command="--data-dir /home --api-key=whatever --enable-cors")
    .with_exposed_ports(8108)
    .waiting_for(_FixedHttpWaitStrategy(8108, "/health").for_status_code(200))
):
    print("ok")

Runtime environment

• MacOS 26.6.2
• Python 3.14.4
• testcontainers 4.14.2

I can work on a PR if you'd like!