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Error when working with grpc

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@andrey090594 wrote:

Hello, we have problems with haproxy 1.9.4 when working with grpc.

We use bidirectional streaming of data and receive this error every 30 seconds (it’s timeout server in our configuration).

io.grpc.StatusRuntimeException: UNAVAILABLE: HTTP status code 504
invalid content-type: text/html
headers: Metadata(:status=504,cache-control=no-cache,content-type=text/html)
DATA-----------------------------
<html><body><h1>504 Gateway Time-out</h1>
The server didn't respond in time.
</body></html>
DATA-----------------------------

Our configuration:

defaults
	log	global
	mode	http
	option	httplog
	option  socket-stats
	option  logasap 
	option  http-use-htx
    option  forwardfor
	timeout connect 30000
    timeout client  30s
    timeout server  30s
    errorfile 400 /etc/haproxy/errors/400.http
    errorfile 403 /etc/haproxy/errors/403.http
    errorfile 408 /etc/haproxy/errors/408.http
    errorfile 500 /etc/haproxy/errors/500.http
    errorfile 502 /etc/haproxy/errors/502.http
    errorfile 503 /etc/haproxy/errors/503.http
    errorfile 504 /etc/haproxy/errors/504.http

frontend main-http-grpc
    description  http:8080,grpc:9090 
	option  http-use-htx
    option forwardfor
	bind *:8080 name main-http 
	bind *:9090 name main-grpc proto h2
	acl http dst_port eq 8080
	acl grpc dst_port eq 9090

	use_backend  testhost if http { hdr_beg(host) -i testhost.local }
	use_backend  testhost-grpc if grpc { hdr_beg(host) -i testhost.local }

backend testhost
        description  http
        option forwardfor
        option httpchk OPTIONS /status
        server testhost1 10.10.10.1:8080 check
        server testhost2 10.10.10.2:8080 check backup disabled

backend testhost-grpc
	option http-use-htx
    description grpc
    server testhost1 11.11.11.1:50051 proto h2 track testhost/testhost1
    server testhost2 11.11.11.2:50051 proto h2 track testhost/testhost2 backup disabled

What could be the problem?
Thanks in advance.

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