Hi: In my work, I use nginx as a http proxy between diffreent services. As we know, Envoy is also a very famous proxy. I have noticed that envoy has a function called 'hedged requests' https://www.envoyproxy.io/docs/envoy/v1.12.2/intro/arch_overview/http/http_routing#request-hedging . This means that Envoy will race multiple simultaneous upstream requests and return the response associated with the first acceptable response headers to the downstream. so ,could nginx support this function ? I have tried to do some change in ngx_http_upstream.c. But I found that too much code needs to be changed to accomplish this function, it's too difficult for me.
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