Make Tomcat sample work with grpcurl

samples/grpc-tomcat/src/main/java/org/springframework/grpc/sample/GrpcServerApplication.java

@@ -1,7 +1,15 @@
 package org.springframework.grpc.sample;
 
+import java.util.Arrays;
+
+import org.apache.coyote.UpgradeProtocol;
+import org.apache.coyote.http2.Http2Protocol;
 import org.springframework.boot.SpringApplication;
 import org.springframework.boot.autoconfigure.SpringBootApplication;
+import org.springframework.boot.web.embedded.tomcat.TomcatConnectorCustomizer;
+import org.springframework.context.annotation.Bean;
+
+import io.netty.handler.ssl.ApplicationProtocolConfig.Protocol;
 
 @SpringBootApplication
 public class GrpcServerApplication {
@@ -10,4 +18,15 @@ public class GrpcServerApplication {
 		SpringApplication.run(GrpcServerApplication.class, args);
 	}
 
+	@Bean
+	public TomcatConnectorCustomizer customizer() {
+		return (connector) -> {
+			for (UpgradeProtocol protocol : connector.findUpgradeProtocols()) {
+				if (protocol instanceof Http2Protocol http2Protocol) {
+					http2Protocol.setOverheadWindowUpdateThreshold(0);
+				}
+			}
+		};
+	}
+
 }

samples/grpc-tomcat/src/test/java/org/springframework/grpc/sample/GrpcServerApplicationTests.java

@@ -2,6 +2,8 @@ package org.springframework.grpc.sample;
 
 import static org.junit.jupiter.api.Assertions.assertEquals;
 
+import java.util.Iterator;
+
 import org.apache.commons.logging.Log;
 import org.apache.commons.logging.LogFactory;
 import org.junit.jupiter.api.Test;
@@ -43,6 +45,16 @@ public class GrpcServerApplicationTests {
 		assertEquals("Hello ==> Alien", response.getMessage());
 	}
 
+	@Test
+	@DirtiesContext
+	void streamResponds() {
+		Iterator<HelloReply> response = stub.streamHello(HelloRequest.newBuilder().setName("Alien").build());
+		assertEquals("Hello(0) ==> Alien", response.next().getMessage());
+		while (response.hasNext()) {
+			log.info(response.next().getMessage());
+		}
+	}
+
 	@TestConfiguration
 	static class ExtraConfiguration {