First example

.gitignore

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+/target
+Cargo.lock
+test_server/*

Cargo.toml

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+[package]
+name = "purple_cello_reverse_proxy"
+version = "0.1.0"
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+tokio = { version = "1", features = ["full"] }

src/main.rs

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+// Yeahbut December 2023
+
+use tokio::io::copy_bidirectional;
+use tokio::net::{TcpListener, TcpStream};
+
+use std::env;
+use std::error::Error;
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn Error>> {
+    let listen_addr = env::args()
+        .nth(1)
+        .unwrap_or_else(|| "127.0.0.1:25565".to_string());
+    let server_addr = env::args()
+        .nth(2)
+        .unwrap_or_else(|| "127.0.0.1:25566".to_string());
+
+    println!("Listening on: {}", listen_addr);
+    println!("Proxying to: {}", server_addr);
+
+    let listener = TcpListener::bind(listen_addr).await?;
+
+    while let Ok((mut inbound, _)) = listener.accept().await {
+        let mut outbound = TcpStream::connect(server_addr.clone()).await?;
+
+        tokio::spawn(async move {
+            copy_bidirectional(&mut inbound, &mut outbound).await
+        });
+    }
+
+    Ok(())
+}

test_server/run.bat

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+java -Xmx4G -Xms1G -XX:SoftMaxHeapSize=3G -XX:+UnlockExperimentalVMOptions -XX:+UseZGC -jar server_1.19.4.jar --nogui

test_server/server.properties

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+#Minecraft server properties
+#Mon Dec 18 15:12:26 MST 2023
+enable-jmx-monitoring=false
+rcon.port=25575
+level-seed=
+gamemode=creative
+enable-command-block=false
+enable-query=false
+generator-settings={}
+enforce-secure-profile=true
+level-name=world
+motd=A Minecraft Server
+query.port=25566
+pvp=true
+generate-structures=true
+max-chained-neighbor-updates=1000000
+difficulty=easy
+network-compression-threshold=256
+max-tick-time=60000
+require-resource-pack=false
+use-native-transport=true
+max-players=20
+online-mode=false
+enable-status=true
+allow-flight=false
+initial-disabled-packs=
+broadcast-rcon-to-ops=true
+view-distance=10
+server-ip=
+resource-pack-prompt=
+allow-nether=true
+server-port=25566
+enable-rcon=false
+sync-chunk-writes=true
+op-permission-level=4
+prevent-proxy-connections=false
+hide-online-players=false
+resource-pack=
+entity-broadcast-range-percentage=100
+simulation-distance=10
+rcon.password=
+player-idle-timeout=0
+force-gamemode=false
+rate-limit=0
+hardcore=false
+white-list=false
+broadcast-console-to-ops=true
+spawn-npcs=true
+spawn-animals=true
+function-permission-level=2
+initial-enabled-packs=vanilla
+level-type=minecraft\:normal
+text-filtering-config=
+spawn-monsters=false
+enforce-whitelist=false
+spawn-protection=16
+resource-pack-sha1=
+max-world-size=29999984