Add HTTP proxy support via environment variables #968
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When HTTPS_PROXY, https_proxy, HTTP_PROXY, or http_proxy environment variables are set, use urllib3.ProxyManager instead of PoolManager. This enables the client to work in environments that require proxy configuration, such as corporate networks, CI/CD pipelines, and sandboxed development environments. The behavior is backward compatible - when no proxy environment variables are set, PoolManager is used as before.
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Automatically use
urllib3.ProxyManagerwhenHTTPS_PROXY/HTTP_PROXYenvironment variables are set.Enables the client to work in proxy-required environments (corporate networks, CI/CD, sandboxed dev environments) without code changes. Follows the same convention as the
requestslibrary.Fully backward compatible - uses
PoolManagerwhen no proxy vars are set.