prompt: We are currently solving the following issue within our repository. Here is the issue text:
  --- BEGIN ISSUE ---
  [BUG] - Healthcheck fails when using proxy
  ### What docker image(s) are you using?
  
  base-notebook
  
  ### Host OS system and architecture running docker image
  
  Windows 11 as host and linux/amd64 for docker
  
  ### What Docker command are you running?
  
  docker compose up with the following dockerfile:
  
  ```Dockerfile
  version: '3.4'
  
  services:
    datamining:
      container_name: xxxx
      image: xxxx
      build:
        context: .
        dockerfile: ./Dockerfile
      ports:
        - "8888:8888"
      volumes:
        - xxxx:/home/jovyan/work
      environment:
        - DOCKER_STACKS_JUPYTER_CMD=lab
      restart: on-failure
  ```
  
  ### How to Reproduce the problem?
  
  Precondition is that the machine has to operate in a corporate environment using the companies proxy.
  Start the container as above.
  Check the state of the container with ```docker container ls```
  The container is marked as unhealthy.
  
  ### Command output
  
  ```bash session
  abcdefghijk    "tini -g -- start-no…"   x hours ago     Up x hours (unhealthy)        0.0.0.0:8888->8888/tcp                             xxxx
  ```
  
  
  ### Expected behavior
  
  ```abcdedfghi   abcdefghijk    "tini -g -- start-no…"   x hours ago     Up x hours (healthy)        0.0.0.0:8888->8888/tcp                             xxxx```
  
  ### Actual behavior
  
  After investigating the issue the problem is that docker_healthcheck.py does not run successfully giving the following error message:
  ```
  Traceback (most recent call last):
    File "/opt/conda/lib/python3.11/site-packages/urllib3/connectionpool.py", line 790, in urlopen
      response = self._make_request(
                 ^^^^^^^^^^^^^^^^^^^
    File "/opt/conda/lib/python3.11/site-packages/urllib3/connectionpool.py", line 536, in _make_request
      response = conn.getresponse()
                 ^^^^^^^^^^^^^^^^^^
    File "/opt/conda/lib/python3.11/site-packages/urllib3/connection.py", line 461, in getresponse
      httplib_response = super().getresponse()
                         ^^^^^^^^^^^^^^^^^^^^^
    File "/opt/conda/lib/python3.11/http/client.py", line 1378, in getresponse
      response.begin()
    File "/opt/conda/lib/python3.11/http/client.py", line 318, in begin
      version, status, reason = self._read_status()
                                ^^^^^^^^^^^^^^^^^^^
    File "/opt/conda/lib/python3.11/http/client.py", line 287, in _read_status
      raise RemoteDisconnected("Remote end closed connection without"
  http.client.RemoteDisconnected: Remote end closed connection without response
  
  The above exception was the direct cause of the following exception:
  
  urllib3.exceptions.ProxyError: ('Unable to connect to proxy', RemoteDisconnected('Remote end closed connection without response'))
  
  The above exception was the direct cause of the following exception:
  
  Traceback (most recent call last):
    File "/opt/conda/lib/python3.11/site-packages/requests/adapters.py", line 486, in send
      resp = conn.urlopen(
             ^^^^^^^^^^^^^
    File "/opt/conda/lib/python3.11/site-packages/urllib3/connectionpool.py", line 844, in urlopen
      retries = retries.increment(
                ^^^^^^^^^^^^^^^^^^
    File "/opt/conda/lib/python3.11/site-packages/urllib3/util/retry.py", line 515, in increment
      raise MaxRetryError(_pool, url, reason) from reason  # type: ignore[arg-type]
      ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  urllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='host.docker.internal', port=9000): Max retries exceeded with url: http://7702f0e1c7d4:8888/api (Caused by ProxyError('Unable to connect to proxy', RemoteDisconnected('Remote end closed connection without response')))
  
  During handling of the above exception, another exception occurred:
  
  Traceback (most recent call last):
    File "/etc/jupyter/docker_healthcheck.py", line 19, in <module>
      r = requests.get(url, verify=False)  # request without SSL verification
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/opt/conda/lib/python3.11/site-packages/requests/api.py", line 73, in get
      return request("get", url, params=params, **kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/opt/conda/lib/python3.11/site-packages/requests/api.py", line 59, in request
      return session.request(method=method, url=url, **kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/opt/conda/lib/python3.11/site-packages/requests/sessions.py", line 589, in request
      resp = self.send(prep, **send_kwargs)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/opt/conda/lib/python3.11/site-packages/requests/sessions.py", line 703, in send
      r = adapter.send(request, **kwargs)
          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
    File "/opt/conda/lib/python3.11/site-packages/requests/adapters.py", line 513, in send
      raise ProxyError(e, request=request)
  requests.exceptions.ProxyError: HTTPConnectionPool(host='host.docker.internal', port=9000): Max retries exceeded with url: http://7702f0e1c7d4:8888/api (Caused by ProxyError('Unable to connect to proxy', RemoteDisconnected('Remote end closed connection without response')))
  ```
  
  ### Anything else?
  
  After investigating the issue further I came to the conclusion that using the proxy will be the problem.  So I applied the following fix to ```docker_healthcheck.py```:
  ```python
  proxies = {
    "http": None,
    "https": None,
  }
  
  r = requests.get(url, proxies=proxies, verify=False)  # request without SSL verification
  ```
  Now the healthcheck works!
  
  ### Latest Docker version
  
  - [X] I've updated my Docker version to the latest available, and the issue still persists
  
  --- END ISSUE ---
  
  Below are some code segments, each from a relevant file. One or more of these files may contain bugs.
  --- BEGIN FILES ---
  Path: `base-notebook/docker_healthcheck.py`
  Content:
  ```
  1 #!/usr/bin/env python3
  2 # Copyright (c) Jupyter Development Team.
  3 # Distributed under the terms of the Modified BSD License.
  4 import json
  5 import os
  6 from pathlib import Path
  7 
  8 import requests
  9 
  10 # A number of operations below deliberately don't check for possible errors
  11 # As this is a healthcheck, it should succeed or raise an exception on error
  12 
  13 runtime_dir = Path("/home/") / os.environ["NB_USER"] / ".local/share/jupyter/runtime/"
  14 json_file = next(runtime_dir.glob("*server-*.json"))
  15 
  16 url = json.loads(json_file.read_bytes())["url"]
  17 url = url + "api"
  18 
  19 r = requests.get(url, verify=False)  # request without SSL verification
  20 r.raise_for_status()
  21 print(r.content)
  22
  ```
  --- END FILES ---
  
  Please first localize the bug based on the issue statement, and then generate a patch according to the `git diff` format fenced by three backticks.
  
  Here is an example:
  
  ```diff
  diff --git a/examples/server_async.py b/examples/server_async.py
  --- a/examples/server_async.py
  +++ b/examples/server_async.py
  @@ -313,4 +313,4 @@
   
   
   if __name__ == "__main__":
  -    asyncio.run(run_async_server("."), debug=True)
  +    asyncio.run(run_async_server(), debug=True)
  diff --git a/examples/server_sync.py b/examples/server_sync.py
  --- a/examples/server_sync.py
  +++ b/examples/server_sync.py
  @@ -313,5 +313,5 @@
   
   
   if __name__ == "__main__":
  -    server = run_sync_server(".")
  +    server = run_sync_server()
       server.shutdown()
  
  ```
  
golden_diff: diff --git a/base-notebook/docker_healthcheck.py b/base-notebook/docker_healthcheck.py
  --- a/base-notebook/docker_healthcheck.py
  +++ b/base-notebook/docker_healthcheck.py
  @@ -16,6 +16,11 @@
   url = json.loads(json_file.read_bytes())["url"]
   url = url + "api"
   
  -r = requests.get(url, verify=False)  # request without SSL verification
  +proxies = {
  +    "http": "",
  +    "https": "",
  +}
  +
  +r = requests.get(url, proxies=proxies, verify=False)  # request without SSL verification
   r.raise_for_status()
   print(r.content)
  
verification_info: {"golden_diff": "diff --git a/base-notebook/docker_healthcheck.py b/base-notebook/docker_healthcheck.py\n--- a/base-notebook/docker_healthcheck.py\n+++ b/base-notebook/docker_healthcheck.py\n@@ -16,6 +16,11 @@\n url = json.loads(json_file.read_bytes())[\"url\"]\n url = url + \"api\"\n \n-r = requests.get(url, verify=False)  # request without SSL verification\n+proxies = {\n+    \"http\": \"\",\n+    \"https\": \"\",\n+}\n+\n+r = requests.get(url, proxies=proxies, verify=False)  # request without SSL verification\n r.raise_for_status()\n print(r.content)\n", "issue": "[BUG] - Healthcheck fails when using proxy\n### What docker image(s) are you using?\r\n\r\nbase-notebook\r\n\r\n### Host OS system and architecture running docker image\r\n\r\nWindows 11 as host and linux/amd64 for docker\r\n\r\n### What Docker command are you running?\r\n\r\ndocker compose up with the following dockerfile:\r\n\r\n```Dockerfile\r\nversion: '3.4'\r\n\r\nservices:\r\n  datamining:\r\n    container_name: xxxx\r\n    image: xxxx\r\n    build:\r\n      context: .\r\n      dockerfile: ./Dockerfile\r\n    ports:\r\n      - \"8888:8888\"\r\n    volumes:\r\n      - xxxx:/home/jovyan/work\r\n    environment:\r\n      - DOCKER_STACKS_JUPYTER_CMD=lab\r\n    restart: on-failure\r\n```\r\n\r\n### How to Reproduce the problem?\r\n\r\nPrecondition is that the machine has to operate in a corporate environment using the companies proxy.\r\nStart the container as above.\r\nCheck the state of the container with ```docker container ls```\r\nThe container is marked as unhealthy.\r\n\r\n### Command output\r\n\r\n```bash session\r\nabcdefghijk    \"tini -g -- start-no\u2026\"   x hours ago     Up x hours (unhealthy)        0.0.0.0:8888->8888/tcp                             xxxx\r\n```\r\n\r\n\r\n### Expected behavior\r\n\r\n```abcdedfghi   abcdefghijk    \"tini -g -- start-no\u2026\"   x hours ago     Up x hours (healthy)        0.0.0.0:8888->8888/tcp                             xxxx```\r\n\r\n### Actual behavior\r\n\r\nAfter investigating the issue the problem is that docker_healthcheck.py does not run successfully giving the following error message:\r\n```\r\nTraceback (most recent call last):\r\n  File \"/opt/conda/lib/python3.11/site-packages/urllib3/connectionpool.py\", line 790, in urlopen\r\n    response = self._make_request(\r\n               ^^^^^^^^^^^^^^^^^^^\r\n  File \"/opt/conda/lib/python3.11/site-packages/urllib3/connectionpool.py\", line 536, in _make_request\r\n    response = conn.getresponse()\r\n               ^^^^^^^^^^^^^^^^^^\r\n  File \"/opt/conda/lib/python3.11/site-packages/urllib3/connection.py\", line 461, in getresponse\r\n    httplib_response = super().getresponse()\r\n                       ^^^^^^^^^^^^^^^^^^^^^\r\n  File \"/opt/conda/lib/python3.11/http/client.py\", line 1378, in getresponse\r\n    response.begin()\r\n  File \"/opt/conda/lib/python3.11/http/client.py\", line 318, in begin\r\n    version, status, reason = self._read_status()\r\n                              ^^^^^^^^^^^^^^^^^^^\r\n  File \"/opt/conda/lib/python3.11/http/client.py\", line 287, in _read_status\r\n    raise RemoteDisconnected(\"Remote end closed connection without\"\r\nhttp.client.RemoteDisconnected: Remote end closed connection without response\r\n\r\nThe above exception was the direct cause of the following exception:\r\n\r\nurllib3.exceptions.ProxyError: ('Unable to connect to proxy', RemoteDisconnected('Remote end closed connection without response'))\r\n\r\nThe above exception was the direct cause of the following exception:\r\n\r\nTraceback (most recent call last):\r\n  File \"/opt/conda/lib/python3.11/site-packages/requests/adapters.py\", line 486, in send\r\n    resp = conn.urlopen(\r\n           ^^^^^^^^^^^^^\r\n  File \"/opt/conda/lib/python3.11/site-packages/urllib3/connectionpool.py\", line 844, in urlopen\r\n    retries = retries.increment(\r\n              ^^^^^^^^^^^^^^^^^^\r\n  File \"/opt/conda/lib/python3.11/site-packages/urllib3/util/retry.py\", line 515, in increment\r\n    raise MaxRetryError(_pool, url, reason) from reason  # type: ignore[arg-type]\r\n    ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\r\nurllib3.exceptions.MaxRetryError: HTTPConnectionPool(host='host.docker.internal', port=9000): Max retries exceeded with url: http://7702f0e1c7d4:8888/api (Caused by ProxyError('Unable to connect to proxy', RemoteDisconnected('Remote end closed connection without response')))\r\n\r\nDuring handling of the above exception, another exception occurred:\r\n\r\nTraceback (most recent call last):\r\n  File \"/etc/jupyter/docker_healthcheck.py\", line 19, in <module>\r\n    r = requests.get(url, verify=False)  # request without SSL verification\r\n        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\r\n  File \"/opt/conda/lib/python3.11/site-packages/requests/api.py\", line 73, in get\r\n    return request(\"get\", url, params=params, **kwargs)\r\n           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\r\n  File \"/opt/conda/lib/python3.11/site-packages/requests/api.py\", line 59, in request\r\n    return session.request(method=method, url=url, **kwargs)\r\n           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\r\n  File \"/opt/conda/lib/python3.11/site-packages/requests/sessions.py\", line 589, in request\r\n    resp = self.send(prep, **send_kwargs)\r\n           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\r\n  File \"/opt/conda/lib/python3.11/site-packages/requests/sessions.py\", line 703, in send\r\n    r = adapter.send(request, **kwargs)\r\n        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^\r\n  File \"/opt/conda/lib/python3.11/site-packages/requests/adapters.py\", line 513, in send\r\n    raise ProxyError(e, request=request)\r\nrequests.exceptions.ProxyError: HTTPConnectionPool(host='host.docker.internal', port=9000): Max retries exceeded with url: http://7702f0e1c7d4:8888/api (Caused by ProxyError('Unable to connect to proxy', RemoteDisconnected('Remote end closed connection without response')))\r\n```\r\n\r\n### Anything else?\r\n\r\nAfter investigating the issue further I came to the conclusion that using the proxy will be the problem.  So I applied the following fix to ```docker_healthcheck.py```:\r\n```python\r\nproxies = {\r\n  \"http\": None,\r\n  \"https\": None,\r\n}\r\n\r\nr = requests.get(url, proxies=proxies, verify=False)  # request without SSL verification\r\n```\r\nNow the healthcheck works!\r\n\r\n### Latest Docker version\r\n\r\n- [X] I've updated my Docker version to the latest available, and the issue still persists\n", "before_files": [{"content": "#!/usr/bin/env python3\n# Copyright (c) Jupyter Development Team.\n# Distributed under the terms of the Modified BSD License.\nimport json\nimport os\nfrom pathlib import Path\n\nimport requests\n\n# A number of operations below deliberately don't check for possible errors\n# As this is a healthcheck, it should succeed or raise an exception on error\n\nruntime_dir = Path(\"/home/\") / os.environ[\"NB_USER\"] / \".local/share/jupyter/runtime/\"\njson_file = next(runtime_dir.glob(\"*server-*.json\"))\n\nurl = json.loads(json_file.read_bytes())[\"url\"]\nurl = url + \"api\"\n\nr = requests.get(url, verify=False)  # request without SSL verification\nr.raise_for_status()\nprint(r.content)\n", "path": "base-notebook/docker_healthcheck.py"}], "after_files": [{"content": "#!/usr/bin/env python3\n# Copyright (c) Jupyter Development Team.\n# Distributed under the terms of the Modified BSD License.\nimport json\nimport os\nfrom pathlib import Path\n\nimport requests\n\n# A number of operations below deliberately don't check for possible errors\n# As this is a healthcheck, it should succeed or raise an exception on error\n\nruntime_dir = Path(\"/home/\") / os.environ[\"NB_USER\"] / \".local/share/jupyter/runtime/\"\njson_file = next(runtime_dir.glob(\"*server-*.json\"))\n\nurl = json.loads(json_file.read_bytes())[\"url\"]\nurl = url + \"api\"\n\nproxies = {\n    \"http\": \"\",\n    \"https\": \"\",\n}\n\nr = requests.get(url, proxies=proxies, verify=False)  # request without SSL verification\nr.raise_for_status()\nprint(r.content)\n", "path": "base-notebook/docker_healthcheck.py"}]}