Hello everyone,
In the latest version(1.13.10)
Does ‘grpc_pass’ support the ‘keepalive’ option ?
My configuration is:

...
http {
...
upstream backend {
server localhost:50051;
keepalive 300;
}
server {
listen 80 http2;
location / {
grpc_pass grpc://backend;
}
...
}
...

It seems not work,
Because I can still see for every request from the front,
Nginx create a new tcp connection between nginx and backend every time.
Is there something wrong in my configuration file?
Or just it is not supported in this version ?

Thanks