[Java] Netty transport use HTTP1?

[mvn...@gmail.com]

The Java implementation supports Netty for transport. Is there a way to make it use HTTP1 with this transport? I need to work with load balancers that don't support HTTP2.

[Spencer Fang]

Hi mvnjpy,

Which load balancer are you using, and how is it configured?

Although it's not impossible to support HTTP1, gRPC today requires HTTP2. You can read this discussion for more info: https://github.com/grpc/grpc-experiments/issues/284

Lyft Envoy is able to do this translation but I have not used it before myself:

https://lyft.github.io/envoy/docs/configuration/http_filters/grpc_http1_bridge_filter.html

On Fri, Aug 4, 2017 at 5:50 PM, <mvn...@gmail.com> wrote:

The Java implementation supports Netty for transport. Is there a way to make it use HTTP1 with this transport? I need to work with load balancers that don't support HTTP2.

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Spencer Fang

[mvn...@gmail.com]

I'm using Amazon Load Balancers.

On Monday, August 7, 2017 at 11:25:35 AM UTC-4, Spencer Fang wrote:

Hi mvnjpy,

Which load balancer are you using, and how is it configured?

Although it's not impossible to support HTTP1, gRPC today requires HTTP2. You can read this discussion for more info: https://github.com/grpc/grpc-experiments/issues/284

Lyft Envoy is able to do this translation but I have not used it before myself:

https://lyft.github.io/envoy/docs/configuration/http_filters/grpc_http1_bridge_filter.html

On Fri, Aug 4, 2017 at 5:50 PM, <mvn...@gmail.com> wrote:

The Java implementation supports Netty for transport. Is there a way to make it use HTTP1 with this transport? I need to work with load balancers that don't support HTTP2.

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Spencer Fang

[Eric Anderson]

Using HTTP/1 in Netty for gRPC is not currently feasible. It's effectively a rewrite.

You need to use the TCP-based mode for those load balancers (any that don't support HTTP/2 to the backend). You probably want to use NettyServerBuilder.maxConnectionAge and NettyServerBuilder.keepAliveTime to cause clients to rebalance over backends over time and avoid the ~1 minute idleness timeout of the LB from causing disconnections.

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