grpc_send_timeout doesn't work, Nginx closes GRPC streams unexpectedly - nginx

Question

everyone!
I have a config for TLS NGINX server, which proxies stream (bidirectional/unidirectional) to my golang GRPC server. I use params in NGINX conf (server context):
grpc_read_timeout 7d;
grpc_send_timeout 7d;
But! My bidirectional streams close after 60s (send data from server frequently, doesn't send any data from client within 60s), as if grpc_send_timeout is set to default value (60s)
But! If I send echo requests from client every 20s it works fine!
I have no idea why grpc_send_timeout doen't work!
nginx.conf:
user nginx;
worker_processes auto;
error_log /var/log/nginx/error.log debug;
pid /run/nginx.pid;
include /usr/share/nginx/modules/*.conf;
events {
worker_connections 1024;
}
http {
resolver 127.0.0.1 valid=10s;
resolver_timeout 10s;
access_log /var/log/nginx/access.log main;
sendfile on;
tcp_nopush on;
tcp_nodelay on;
keepalive_timeout 65;
types_hash_max_size 2048;
include /etc/nginx/mime.types;
default_type application/octet-stream;
include /etc/nginx/conf.d/*.conf;
}
conf.d/my.service.conf
server {
listen 443 ssl http2;
ssl_certificate my-cert.crt;
ssl_certificate_key my-key.key;
access_log "/var/log/nginx/my.service.access.log" main;
error_log "/var/log/nginx/my.service.error.log" debug;
grpc_set_header x-real-ip $remote_addr;
grpc_set_header x-ray-id $request_id;
grpc_read_timeout 7d;
grpc_send_timeout 7d; // why it does not work?????
location /MyGoPackage.MyService {
grpc_pass grpc://my.service.host:4321;
}
}
nginx logs:
/ # cat /var/log/nginx/my_host_access.log
59.932 192.168.176.1 - - [06/May/2021:14:57:30 +0000] "POST /MyGoPackege.MyService/MyStreamEndpoint HTTP/2.0" 200 1860 "-" "grpc-go/1.29.1" "-"
client logs (with GRPC debug logs)
2021-05-06T17:56:30.609+0300 DEBUG grpc_mobile_client/main.go:39 open connection {"address": "localhost:443"}
INFO: 2021/05/06 17:56:30 parsed scheme: ""
INFO: 2021/05/06 17:56:30 scheme "" not registered, fallback to default scheme
INFO: 2021/05/06 17:56:30 ccResolverWrapper: sending update to cc: {[{localhost:443 <nil> 0 <nil>}] <nil> <nil>}
INFO: 2021/05/06 17:56:30 ClientConn switching balancer to "pick_first"
INFO: 2021/05/06 17:56:30 Channel switches to new LB policy "pick_first"
INFO: 2021/05/06 17:56:30 Subchannel Connectivity change to CONNECTING
INFO: 2021/05/06 17:56:30 Subchannel picks a new address "localhost:443" to connect
INFO: 2021/05/06 17:56:30 pickfirstBalancer: HandleSubConnStateChange: 0xc0004b2d60, {CONNECTING <nil>}
INFO: 2021/05/06 17:56:30 Channel Connectivity change to CONNECTING
INFO: 2021/05/06 17:56:30 Subchannel Connectivity change to READY
INFO: 2021/05/06 17:56:30 pickfirstBalancer: HandleSubConnStateChange: 0xc0004b2d60, {READY <nil>}
INFO: 2021/05/06 17:56:30 Channel Connectivity change to READY
2021-05-06T17:56:30.628+0300 DEBUG main.go:54 open stream {"address": localhost:443"}
2021-05-06T17:56:30.974+0300 INFO main.go:81 new msg from server {"msg": "hello world"}
// some logs within a 60s
2021-05-06T17:57:30.567+0300 FATAL main.go:79 receive new msg from stream {"error": "rpc error: code = Internal desc = stream terminated by RST_STREAM with error code: PROTOCOL_ERROR"}
server logs (only this one at the moment of connect closing, GRPC debug log):
INFO: 2021/05/06 17:57:30 transport: loopyWriter.run returning. connection error: desc = "transport is closing"

Answer 1

client_header_timeout 7d;
client_body_timeout 7d;
adding this params to nginx conf solved the problem