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125# Exceptions
This page lists exceptions that may be raised when using HTTPX.
For an overview of how to work with HTTPX exceptions, see [Exceptions (Quickstart)](quickstart.md#exceptions).
## The exception hierarchy
* HTTPError
* RequestError
* TransportError
* TimeoutException
* ConnectTimeout
* ReadTimeout
* WriteTimeout
* PoolTimeout
* NetworkError
* ConnectError
* ReadError
* WriteError
* CloseError
* ProtocolError
* LocalProtocolError
* RemoteProtocolError
* ProxyError
* UnsupportedProtocol
* DecodingError
* TooManyRedirects
* HTTPStatusError
* InvalidURL
* CookieConflict
* StreamError
* StreamConsumed
* ResponseNotRead
* RequestNotRead
* StreamClosed
---
## Exception classes
::: httpx.HTTPError
:docstring:
::: httpx.RequestError
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::: httpx.TransportError
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::: httpx.TimeoutException
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::: httpx.ConnectTimeout
:docstring:
::: httpx.ReadTimeout
:docstring:
::: httpx.WriteTimeout
:docstring:
::: httpx.PoolTimeout
:docstring:
::: httpx.NetworkError
:docstring:
::: httpx.ConnectError
:docstring:
::: httpx.ReadError
:docstring:
::: httpx.WriteError
:docstring:
::: httpx.CloseError
:docstring:
::: httpx.ProtocolError
:docstring:
::: httpx.LocalProtocolError
:docstring:
::: httpx.RemoteProtocolError
:docstring:
::: httpx.ProxyError
:docstring:
::: httpx.UnsupportedProtocol
:docstring:
::: httpx.DecodingError
:docstring:
::: httpx.TooManyRedirects
:docstring:
::: httpx.HTTPStatusError
:docstring:
::: httpx.InvalidURL
:docstring:
::: httpx.CookieConflict
:docstring:
::: httpx.StreamError
:docstring:
::: httpx.StreamConsumed
:docstring:
::: httpx.StreamClosed
:docstring:
::: httpx.ResponseNotRead
:docstring:
::: httpx.RequestNotRead
:docstring: