Unexpected synchronization error with a remote repository

Version

  {
    "component": "core",
    "version": "3.83.2",
    "package": "pulpcore",
    "module": "pulpcore.app",
    "domain_compatible": true
  },
  {
    "component": "python",
    "version": "3.17.0",
    "package": "pulp-python",
    "module": "pulp_python.app",
    "domain_compatible": true
  }

Describe the bug
hello! I want to try to use your project, but I'm facing a problem...
I added:

[
  {
    "pulp_href": "/pulp/api/v3/repositories/python/python/01985ca2-f970-7825-a3f8-122610f262a3/",
    "prn": "prn:python.pythonrepository:01985ca2-f970-7825-a3f8-122610f262a3",
    "pulp_created": "2025-07-30T18:40:41.329775Z",
    "pulp_last_updated": "2025-07-31T08:49:44.630701Z",
    "versions_href": "/pulp/api/v3/repositories/python/python/01985ca2-f970-7825-a3f8-122610f262a3/versions/",
    "pulp_labels": {},
    "latest_version_href": "/pulp/api/v3/repositories/python/python/01985ca2-f970-7825-a3f8-122610f262a3/versions/1/",
    "name": "distro_local",
    "description": null,
    "retain_repo_versions": null,
    "remote": null,
    "autopublish": false
  }
]

remote:

[
  {
    "pulp_href": "/pulp/api/v3/remotes/python/python/01985fcc-9589-7a26-94f7-9c1601fd8fb8/",
    "prn": "prn:python.pythonremote:01985fcc-9589-7a26-94f7-9c1601fd8fb8",
    "pulp_created": "2025-07-31T09:24:59.914051Z",
    "pulp_last_updated": "2025-07-31T09:24:59.914073Z",
    "name": "test-remote",
    "url": "https://mirrors.aliyun.com/pypi",
    "ca_cert": null,
    "client_cert": null,
    "tls_validation": true,
    "proxy_url": null,
    "pulp_labels": {},
    "download_concurrency": null,
    "max_retries": null,
    "policy": "immediate",
    "total_timeout": null,
    "connect_timeout": null,
    "sock_connect_timeout": null,
    "sock_read_timeout": null,
    "headers": null,
    "rate_limit": null,
    "hidden_fields": [
      {
        "name": "client_key",
        "is_set": false
      },
      {
        "name": "proxy_username",
        "is_set": false
      },
      {
        "name": "proxy_password",
        "is_set": false
      },
      {
        "name": "username",
        "is_set": false
      },
      {
        "name": "password",
        "is_set": false
      }
    ],
    "includes": [
      "distro"
    ],
    "excludes": [],
    "prereleases": true,
    "package_types": [],
    "keep_latest_packages": 0,
    "exclude_platforms": []
  }
]

But I still couldn't get the packets to sync...

I came across a topic: https://github.com/pulp/pulp_python/issues/868

I assumed that these were interrelated issues. Can you confirm this? I used several options:

• https://mirrors.aliyun.com/pypi
• https://mirrors.aliyun.com/pypi/
• https://mirrors.aliyun.com/pypi/simple

But I still couldn't synchronize the packages. Can you suggest a solution? pypi.org it's not available on my network, I can't use it.

At the same time, I clarified: "the mirror https://mirrors.aliyun.com/pypi/simple / fully supports the same Simple Repository API as the official PyPI "

To Reproduce

pulp python remote create   --name test-remote   --url https://mirrors.aliyun.com/pypi/   --includes '["distro"]'   --policy immediate

pulp python repository update   --name distro_local   --remote test-remote

pulp python repository sync --name distro_local

Expected behavior
I was waiting for the synchronization of packages

Start by reproducing the reported setup with the pulp python remote create, repository update, and repository sync commands, testing the listed mirror URL variants. Read the related pulp_python issue 868 and compare the sync behavior and error details. Done means identifying the cause and documenting or implementing a confirmed way to synchronize the selected distro packages from the mirror.