Vendor dependencies for 0.3.0 release

vendor/wasi/examples/http-proxy-no_std.rs

@@ -0,0 +1,22 @@
+use wasip2::http::types::{
+    Fields, IncomingRequest, OutgoingBody, OutgoingResponse, ResponseOutparam,
+};
+
+wasip2::http::proxy::export!(Example);
+
+struct Example;
+
+impl wasip2::exports::http::incoming_handler::Guest for Example {
+    fn handle(_request: IncomingRequest, response_out: ResponseOutparam) {
+        let resp = OutgoingResponse::new(Fields::new());
+        let body = resp.body().unwrap();
+
+        ResponseOutparam::set(response_out, Ok(resp));
+
+        let out = body.write().unwrap();
+        out.blocking_write_and_flush(b"Hello, WASI!").unwrap();
+        drop(out);
+
+        OutgoingBody::finish(body, None).unwrap();
+    }
+}