chore: checkpoint before Python removal

vendor/wasip3/examples/http-proxy-compat.rs

@@ -0,0 +1,20 @@
+use wasip3::http::types::{self, ErrorCode};
+use wasip3::http_compat::{http_from_wasi_request, http_into_wasi_response, IncomingRequestBody};
+
+wasip3::http::service::export!(Example);
+
+struct Example;
+
+impl wasip3::exports::http::handler::Guest for Example {
+    async fn handle(request: types::Request) -> Result<types::Response, ErrorCode> {
+        let request = http_from_wasi_request(request)?;
+        let response = serve(request).await?;
+        http_into_wasi_response(response)
+    }
+}
+
+async fn serve(
+    _request: http::Request<IncomingRequestBody>,
+) -> Result<http::Response<String>, ErrorCode> {
+    Ok(http::Response::new("Hello, WASI!".to_string()))
+}