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Add CORS Max-Age header of 600 seconds #11819
                
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This PR adds a CORS
Access-Control-Max-Ageof600seconds to RPC pre-flightOPTIONSresponses.Original issue #8542 was closed a year later as being implemented in paritytech/jsonrpc#280, but that was (and still is) disabled by default, so this was never actually resolved.
The value of
600seconds matches Geth's implementation.Fixes #8542.