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Investigate supporting the Expect header in RPC #1671
curl (and curl wrappers) sends the Expect header by default. For large requests (>1K), this causes curl to delay for 1 second waiting for the "100-continue" response. Postman and many other clients does not send this by default.
A workaround for curl is to add
Adding support for this header in the node may be unnecessary if RPC gets externalized, as any external web server is likely to support this already.