ProxyManager doesn t honor HTTPConnection default socket GitHub
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okay, let's dive deep into the issue of `proxymanager` not honoring the default socket timeout in `httpconnection` when using the `urllib3` library in python. this is a common pain point for developers who expect global timeout settings to apply consistently when proxies are involved. we'll cover the problem, why it happens, how to diagnose it, and multiple solutions with code examples.
*understanding the problem: `proxymanager` vs. `httpconnection` and timeouts*
when you make http requests in python using `urllib3` (which is the underlying library used by the popular `requests` library in many cases), you have two main components to consider for managing connections:
1. *`httpconnection` and `httpsconnection`:* these classes are the fundamental building blocks for establishing tcp connections and sending http/https requests directly to a server. you can configure timeouts at this level. the `socket_options` argument of `httpconnection` and `httpsconnection` classes can be used to set socket-level options, including timeouts.
2. *`poolmanager` and `proxymanager`:* these classes act as connection pools, providing a higher-level abstraction for managing connections and potentially reusing them for performance optimization. `poolmanager` manages direct connections, while `proxymanager` is specifically designed for handling connections through http or https proxies.
the core problem is that when using `proxymanager`, the timeout settings configured directly on `httpconnection` (especially through `socket_options`) may not be respected. `proxymanager` creates its own `httpconnection` instances, and if it doesn't explicitly propagate your desired timeout settings, you'll end up with the default timeout (which is usually no timeout at all). this can lead to requests hanging indefinitely when encountering network issues or slow servers behind a proxy.
*why this happens: the propagation issue*
the reason for this behavior stems from how `proxymanage ...
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