A simple reverse proxy, to be used with Hyper.
The implementation ensures that Hop-by-hop headers are stripped correctly in both directions,
and adds the client's IP address to a comma-space-separated list of forwarding addresses in the
X-Forwarded-For header.
The implementation is based on Go's httputil.ReverseProxy.
Add these dependencies to your Cargo.toml file.
[dependencies]
hyper-reverse-proxy = "0.6"
hyper = { version = "0.14", features = ["server"] }
tokio = { version = "1", features = ["full"] }The following example will set up a reverse proxy listening on 127.0.0.1:13900,
and will proxy these calls:
-
"/target/first"will be proxied tohttp://127.0.0.1:13901 -
"/target/second"will be proxied tohttp://127.0.0.1:13902 -
All other URLs will be handled by
debug_requestfunction, that will display request information.
use hyper::server::{Server, conn::AddrStream};
use hyper::{Body, Request, Response, StatusCode};
use hyper::service::{service_fn, make_service_fn};
use std::{convert::Infallible, net::SocketAddr};
use hyper::http::uri::InvalidUri;
use std::net::IpAddr;
fn debug_request(req: Request<Body>) -> Result<Response<Body>, Infallible> {
let body_str = format!("{:?}", req);
Ok(Response::new(Body::from(body_str)))
}
async fn handle(client_ip: IpAddr, req: Request<Body>) -> Result<Response<Body>, Infallible> {
if req.uri().path().starts_with("/target/first") {
// will forward requests to port 13901
match hyper_reverse_proxy::call(client_ip, "http://127.0.0.1:13901", req).await {
Ok(response) => {Ok(response)}
Err(error) => {Ok(Response::builder()
.status(StatusCode::INTERNAL_SERVER_ERROR)
.body(Body::empty())
.unwrap())}
}
} else if req.uri().path().starts_with("/target/second") {
// will forward requests to port 13902
match hyper_reverse_proxy::call(client_ip, "http://127.0.0.1:13902", req).await {
Ok(response) => {Ok(response)}
Err(error) => {Ok(Response::builder()
.status(StatusCode::INTERNAL_SERVER_ERROR)
.body(Body::empty())
.unwrap())}
}
} else {
debug_request(req)
}
}
#[tokio::main]
async fn main() {
let bind_addr = "127.0.0.1:13900";
let addr:SocketAddr = bind_addr.parse().expect("Could not parse ip:port.");
let make_svc = make_service_fn(|conn: &AddrStream| {
let remote_addr = conn.remote_addr().ip();
async move {
Ok::<_, Infallible>(service_fn(move |req| handle(remote_addr, req)))
}
});
let server = Server::bind(&addr).serve(make_svc);
if let Err(e) = server.await {
eprintln!("server error: {}", e);
}
println!("Running server on {:?}", addr);
}