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When using urllib3\u0027s proxy support with `ProxyManager`, the `Proxy-Authorization` header is only sent to the configured proxy, as expected. However, when sending HTTP requests *without* using urllib3\u0027s proxy support, it\u0027s possible to accidentally configure the `Proxy-Authorization` header even though it won\u0027t have any effect as the request is not using a forwarding proxy or a tunneling proxy. In those cases, urllib3 doesn\u0027t treat the `Proxy-Authorization` HTTP header as one carrying authentication material and thus doesn\u0027t strip the header on cross-origin redirects. Because this is a highly unlikely scenario, we believe the severity of this vulnerability is low for almost all users. Out of an abundance of caution urllib3 will automatically strip the `Proxy-Authorization` header during cross-origin redirects to avoid the small chance that users are doing this on accident. 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