Rust grpc call "Connection refused"

Question

I have a Java GRPC endpoint and I want to call it from a RUST client. If I use postman I get the response. Everything is fine.

Postman call

When I try to do it from rust, I get the error:

Error: tonic::transport::Error(Transport, hyper::Error(Connect, ConnectError("tcp connect error", Os { code: 111, kind: ConnectionRefused, message: "Connection refused" })))

Code:

use todo::todo_client::TodoClient;
use todo::{CreateTodoRequest};

pub mod todo {
tonic::include_proto!("todo");
}

#[tokio::main]
async fn main() -> Result<(), Box<dyn std::error::Error>> {

let mut client = TodoClient::connect("http://0.0.0.0:50052").await?;

let create_request = tonic::Request::new(CreateTodoRequest {
    username: "username".to_string(),
    password: "password".to_string(),
});

let create_response = client.authenticate(create_request).await?;

println!("{:?}", create_response.into_inner());

Ok(())
}

I tried change the URL to "localhost", with and without http://, didn't work. Im using the same proto file:

syntax = "proto3";

package todo;

message CreateTodoRequest  {
   string username = 1;
   string password = 2;
}

message CreateTodoResponse  {
   int32 expiresIn = 1;
   string accessToken = 2;
   string refreshToken =3;
   string idToken = 4;
}

service Todo {
   rpc authenticate(CreateTodoRequest ) returns (CreateTodoResponse );
}