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Timeout configuration.
**Usage**:
Timeout(None) # No timeouts.
Timeout(5.0) # 5s timeout on all operations.
Timeout(None, connect=5.0) # 5s timeout on connect, no other timeouts.
Timeout(5.0, connect=10.0) # 10s timeout on connect. 5s timeout elsewhere.
Timeout(5.0, pool=None) # No timeout on acquiring connection from pool.
# 5s timeout elsewhere.
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Configuration for limits to various client behaviors.
**Parameters:**
* **max_connections** - The maximum number of concurrent connections that may be
established.
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keep-alive connections below this point. Should be less than or equal
to `max_connections`.
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