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* rpc: rework timeouts to be per-method instead of global Prior to this change, we set a 10-second global timeout for all RPC methods using the net/http Server type's WriteTimeout. This meant that any request whose handler did not return within that period would simply drop the connection to the client. This timeout is too short for a default, as evidenced by issues like [1] and [2]. In addition, the mode of failure on the client side is confusing; it shows up as a dropped connection (EOF) rather than a meaningful error from the service. More importantly, various methods have diffent constraints: Some should be able to return quickly, others may need to adjust based on the application workload. This is a first step toward supporting configurable timeouts. This change: - Removes the server-wide default global timeout, and instead: - Wires up a default context timeout for all RPC handlers. - Increases the default timeout from 10s to 60s. - Adds a hook to override this per-method as needed. This does NOT expose the timeouts in the configuration file (yet). [1] https://github.com/osmosis-labs/osmosis/issues/1391 [2] https://github.com/tendermint/tendermint/issues/8465