chore: checkpoint before Python removal

vendor/hyper-util/examples/client.rs

@@ -0,0 +1,37 @@
+use std::env;
+
+use http_body_util::Empty;
+use hyper::Request;
+use hyper_util::client::legacy::{connect::HttpConnector, Client};
+
+#[tokio::main(flavor = "current_thread")]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let url = match env::args().nth(1) {
+        Some(url) => url,
+        None => {
+            eprintln!("Usage: client <url>");
+            return Ok(());
+        }
+    };
+
+    // HTTPS requires picking a TLS implementation, so give a better
+    // warning if the user tries to request an 'https' URL.
+    let url = url.parse::<hyper::Uri>()?;
+    if url.scheme_str() != Some("http") {
+        eprintln!("This example only works with 'http' URLs.");
+        return Ok(());
+    }
+
+    let client = Client::builder(hyper_util::rt::TokioExecutor::new()).build(HttpConnector::new());
+
+    let req = Request::builder()
+        .uri(url)
+        .body(Empty::<bytes::Bytes>::new())?;
+
+    let resp = client.request(req).await?;
+
+    eprintln!("{:?} {:?}", resp.version(), resp.status());
+    eprintln!("{:#?}", resp.headers());
+
+    Ok(())
+}