feat: add salvo

__web/salvo/Cargo.toml

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+[package]
+name = "salvo"
+version = "0.1.0"
+authors = ["Hatter Jiang <jht5945@gmail.com>"]
+edition = "2018"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[dependencies]
+salvo = "0.9"
+tokio = { version = "1", features = ["full"] }
+

__web/salvo/README.md

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+Website:
+https://github.com/salvo-rs/salvo/
+

__web/salvo/src/main.rs

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+use salvo::prelude::*;
+
+#[fn_handler]
+async fn hello_world(req: &mut Request, _depot: &mut Depot, res: &mut Response) {
+    let mut output = String::with_capacity(1024);
+    output.push_str(&format!("request: {:#?}", req));
+    res.render_plain_text(&output);
+}
+
+#[fn_handler]
+async fn print_json(res: &mut Response) {
+    res.render_json_text("{\"data\": \"hello\"}\n")
+}
+
+#[fn_handler]
+async fn send_redirect(res: &mut Response) {
+    res.redirect_temporary("https://hatter.ink/");
+}
+
+#[tokio::main]
+async fn main() {
+    let router = Router::new().push(
+        Router::new().get(hello_world)
+    ).push(
+        Router::new().path("json").get(print_json)
+    ).push(
+        Router::new().path("redirect").get(send_redirect)
+    );
+    let server = Server::new(router);
+    server.bind(([0, 0, 0, 0], 7878)).await;
+}