How can I increase the max encoding/decoding message size?

[ihyunnam]

Hi, I'm getting the following error when using tonic v0.12.0. I believe the error is due to tonic's restriction of 4MB max encoding/decoding message size.

``Err value: Status { code: OutOfRange, message: "Error, decoded message length too large: found 7180018 bytes, the limit is: 4194304 bytes", metadata: MetadataMap { headers: {"content-type": "application/grpc", "date": "Mon, 28 Apr 2025 12:31:03 GMT", "content-length": "0"} }, source: None }.

The relevant part of the code is let response = client.some_grpc_function(tonic::Request::new(some_message).await.unwrap();
where client is my gRPC client defined like let mut client = MyServiceClient::connect("http://x.x.x.x:50051").await.unwrap().

I still had the same issue when I tried declaring the client like let mut client = MyServiceClient::connect("http://x.x.x.x:50051").await.unwrap() .max_encoding_size(5*1024*1024) .max_decoding_size(5*1024*1024). Does anyone have a solution? Thanks!

[LucioFranco]

The server side also limits things https://docs.rs/tonic/latest/tonic/server/struct.Grpc.html#method.max_encoding_message_size so you may need to also include those settings there as well.