René's URL Explorer Experiment

{"@context":"https://schema.org","@type":"DiscussionForumPosting","headline":"support proxy server","articleBody":"I work behind a proxy server, and the urllib3.PoolManager does not automatically check the proxy environment variables.\r\n\r\nI modified util.py/urlopen as follows and it seems to work:\r\n - added import os to get access to os.getenv\r\n - most programs look for \u003cPROTOCOL\u003e_PROXY for the URL for the proxy, so, e.g., HTTPS_PROXY or HTTP_PROXY\r\n - So, I check for the protocol by splitting the URL on ':', then build the environment variable with the uppercase protocol and _PROXY\r\n - if a matching environment variable exists, I use that to initialize a urllib3.ProxyManager(proxy_url) in place of the PoolManager\r\n - otherwise, go to default non-proxy behavior using the PoolManager\r\nThis seems to work.\r\nTwo changes in urlopen shown below - add import os, and add code block looking at the proxy (look for # TPO comments)\r\n\r\ndef urlopen(url):\r\n    \"\"\"Wrapper to request.get() in urllib3\"\"\"\r\n\r\n    import os # TPO added for proxy env check\r\n    import sys\r\n    import urllib3\r\n    from json import load\r\n\r\n    # https://stackoverflow.com/a/2020083\r\n    def get_full_class_name(obj):\r\n        module = obj.__class__.__module__\r\n        if module is None or module == str.__class__.__module__:\r\n            return obj.__class__.__name__\r\n        return module + '.' + obj.__class__.__name__\r\n\r\n    c = \" If problem persists, a contact email for the server may be listed \"\r\n    c = c + \"at http://hapi-server.org/servers/\"\r\n    msg = '';\r\n    try:\r\n        # code block added by TPO to manage proxy\r\n        protocol = url.split(':')[0]\r\n        proxy_url = os.getenv(protocol.upper()+'_PROXY')\r\n        if proxy_url:\r\n            http = urllib3.ProxyManager(proxy_url)\r\n        else:\r\n            http = urllib3.PoolManager() # original single line\r\n        # end of code block added by TPO to manage proxy\r\n        res = http.request('GET', url, preload_content=False, retries=2)\r\n--snip--","author":{"url":"https://github.com/tpoiii","@type":"Person","name":"tpoiii"},"datePublished":"2023-04-23T15:41:23.000Z","interactionStatistic":{"@type":"InteractionCounter","interactionType":"https://schema.org/CommentAction","userInteractionCount":2},"url":"https://github.com/70/client-python/issues/70"}