Adding upstream version 115.7.0esr.upstream/115.7.0esr

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

29 files changed, 1615 insertions, 0 deletions

diff --git a/third_party/rust/warp/examples/README.md b/third_party/rust/warp/examples/README.md
new file mode 100644
index 0000000000..1b3bb8a2ae
--- /dev/null
+++ b/third_party/rust/warp/examples/README.md
@@ -0,0 +1,68 @@
+# Examples
+
+Welcome to the examples! These show off `warp`'s functionality and explain how to use it.
+
+## Getting Started
+
+To get started, run `examples/hello.rs` with:
+
+```bash
+> cargo run --example hello
+```
+
+This will start a simple "hello world" service running on your localhost port 3030.
+
+Open another terminal and run:
+
+```bash
+> curl http://localhost:3030/hi
+Hello, World!%
+```
+
+Congratulations, you have just run your first warp service!
+
+You can run other examples with `cargo run --example [example name]`:
+
+- [`hello.rs`](./hello.rs) - Just a basic "Hello World" API
+- [`routing.rs`](./routing.rs) - Builds up a more complex set of routes and shows how to combine filters
+- [`body.rs`](./body.rs) - What's a good API without parsing data from the request body?
+- [`headers.rs`](./headers.rs) - Parsing data from the request headers
+- [`rejections.rs`](./rejections.rs) - Your APIs are obviously perfect, but for silly others who call them incorrectly you'll want to define errors for them
+- [`futures.rs`](./futures.rs) - Wait, wait! ... Or how to integrate futures into filters
+- [`todos.rs`](./todos.rs) - Putting this all together with a proper app
+
+## Further Use Cases
+
+### Serving HTML and Other Files
+
+- [`file.rs`](./file.rs) - Serving static files
+- [`dir.rs`](./dir.rs) - Or a whole directory of files
+- [`handlebars_template.rs`](./handlebars_template.rs) - Using Handlebars to fill in an HTML template
+
+### Websockets
+
+Hooray! `warp` also includes built-in support for WebSockets
+
+- [`websockets.rs`](./websockets.rs) - Basic handling of a WebSocket upgrade
+- [`websockets_chat.rs`](./websockets_chat.rs) - Full WebSocket app
+
+### Server-Side Events
+
+- [`sse.rs`](./sse.rs) - Basic Server-Side Event
+- [`sse_chat.rs`](./sse_chat.rs) - Full SSE app
+
+### TLS
+
+- [`tls.rs`](./tls.rs) - can i haz security?
+
+### Autoreloading
+
+- [`autoreload.rs`](./autoreload.rs) - Change some code and watch the server reload automatically!
+
+### Debugging
+
+- [`tracing.rs`](./tracing.rs) - Warp has built-in support for rich diagnostics with [`tracing`](https://docs.rs/tracing)!
+
+## Custom HTTP Methods
+
+- [`custom_methods.rs`](./custom_methods.rs) - It is also possible to use Warp with custom HTTP methods.
diff --git a/third_party/rust/warp/examples/autoreload.rs b/third_party/rust/warp/examples/autoreload.rs
new file mode 100644
index 0000000000..a21d9b1369
--- /dev/null
+++ b/third_party/rust/warp/examples/autoreload.rs
@@ -0,0 +1,42 @@
+#![deny(warnings)]
+use hyper::server::Server;
+use listenfd::ListenFd;
+use std::convert::Infallible;
+use warp::Filter;
+
+/// You'll need to install `systemfd` and `cargo-watch`:
+/// ```
+/// cargo install systemfd cargo-watch
+/// ```
+/// And run with:
+/// ```
+/// systemfd --no-pid -s http::3030 -- cargo watch -x 'run --example autoreload'
+/// ```
+#[tokio::main]
+async fn main() {
+    // Match any request and return hello world!
+    let routes = warp::any().map(|| "Hello, World!");
+
+    // hyper let's us build a server from a TcpListener (which will be
+    // useful shortly). Thus, we'll need to convert our `warp::Filter` into
+    // a `hyper::service::MakeService` for use with a `hyper::server::Server`.
+    let svc = warp::service(routes);
+
+    let make_svc = hyper::service::make_service_fn(|_: _| {
+        // the clone is there because not all warp filters impl Copy
+        let svc = svc.clone();
+        async move { Ok::<_, Infallible>(svc) }
+    });
+
+    let mut listenfd = ListenFd::from_env();
+    // if listenfd doesn't take a TcpListener (i.e. we're not running via
+    // the command above), we fall back to explicitly binding to a given
+    // host:port.
+    let server = if let Some(l) = listenfd.take_tcp_listener(0).unwrap() {
+        Server::from_tcp(l).unwrap()
+    } else {
+        Server::bind(&([127, 0, 0, 1], 3030).into())
+    };
+
+    server.serve(make_svc).await.unwrap();
+}
diff --git a/third_party/rust/warp/examples/body.rs b/third_party/rust/warp/examples/body.rs
new file mode 100644
index 0000000000..174d928ab8
--- /dev/null
+++ b/third_party/rust/warp/examples/body.rs
@@ -0,0 +1,30 @@
+#![deny(warnings)]
+
+use serde_derive::{Deserialize, Serialize};
+
+use warp::Filter;
+
+#[derive(Deserialize, Serialize)]
+struct Employee {
+    name: String,
+    rate: u32,
+}
+
+#[tokio::main]
+async fn main() {
+    pretty_env_logger::init();
+
+    // POST /employees/:rate  {"name":"Sean","rate":2}
+    let promote = warp::post()
+        .and(warp::path("employees"))
+        .and(warp::path::param::<u32>())
+        // Only accept bodies smaller than 16kb...
+        .and(warp::body::content_length_limit(1024 * 16))
+        .and(warp::body::json())
+        .map(|rate, mut employee: Employee| {
+            employee.rate = rate;
+            warp::reply::json(&employee)
+        });
+
+    warp::serve(promote).run(([127, 0, 0, 1], 3030)).await
+}
diff --git a/third_party/rust/warp/examples/compression.rs b/third_party/rust/warp/examples/compression.rs
new file mode 100644
index 0000000000..1a52c7a7d0
--- /dev/null
+++ b/third_party/rust/warp/examples/compression.rs
@@ -0,0 +1,34 @@
+#![deny(warnings)]
+
+use warp::Filter;
+
+#[tokio::main]
+async fn main() {
+    let file = warp::path("todos").and(warp::fs::file("./examples/todos.rs"));
+    // NOTE: You could double compress something by adding a compression
+    // filter here, a la
+    // ```
+    // let file = warp::path("todos")
+    //     .and(warp::fs::file("./examples/todos.rs"))
+    //     .with(warp::compression::brotli());
+    // ```
+    // This would result in a browser error, or downloading a file whose contents
+    // are compressed
+
+    let dir = warp::path("ws_chat").and(warp::fs::file("./examples/websockets_chat.rs"));
+
+    let file_and_dir = warp::get()
+        .and(file.or(dir))
+        .with(warp::compression::gzip());
+
+    let examples = warp::path("ex")
+        .and(warp::fs::dir("./examples/"))
+        .with(warp::compression::deflate());
+
+    // GET /todos => gzip -> toods.rs
+    // GET /ws_chat => gzip -> ws_chat.rs
+    // GET /ex/... => deflate -> ./examples/...
+    let routes = file_and_dir.or(examples);
+
+    warp::serve(routes).run(([127, 0, 0, 1], 3030)).await;
+}
diff --git a/third_party/rust/warp/examples/custom_methods.rs b/third_party/rust/warp/examples/custom_methods.rs
new file mode 100644
index 0000000000..2e26604132
--- /dev/null
+++ b/third_party/rust/warp/examples/custom_methods.rs
@@ -0,0 +1,61 @@
+#![deny(warnings)]
+use std::net::SocketAddr;
+
+use warp::hyper::StatusCode;
+use warp::{hyper::Method, reject, Filter, Rejection, Reply};
+
+#[derive(Debug)]
+struct MethodError;
+impl reject::Reject for MethodError {}
+
+const FOO_METHOD: &'static str = "FOO";
+const BAR_METHOD: &'static str = "BAR";
+
+fn method(name: &'static str) -> impl Filter<Extract = (), Error = Rejection> + Clone {
+    warp::method()
+        .and_then(move |m: Method| async move {
+            if m == name {
+                Ok(())
+            } else {
+                Err(reject::custom(MethodError))
+            }
+        })
+        .untuple_one()
+}
+
+pub async fn handle_not_found(reject: Rejection) -> Result<impl Reply, Rejection> {
+    if reject.is_not_found() {
+        Ok(StatusCode::NOT_FOUND)
+    } else {
+        Err(reject)
+    }
+}
+
+pub async fn handle_custom(reject: Rejection) -> Result<impl Reply, Rejection> {
+    if reject.find::<MethodError>().is_some() {
+        Ok(StatusCode::METHOD_NOT_ALLOWED)
+    } else {
+        Err(reject)
+    }
+}
+
+#[tokio::main]
+async fn main() -> Result<(), Box<dyn std::error::Error>> {
+    let address: SocketAddr = "[::]:3030".parse()?;
+
+    let foo_route = method(FOO_METHOD)
+        .and(warp::path!("foo"))
+        .map(|| "Success")
+        .recover(handle_not_found);
+
+    let bar_route = method(BAR_METHOD)
+        .and(warp::path!("bar"))
+        .map(|| "Success")
+        .recover(handle_not_found);
+
+    warp::serve(foo_route.or(bar_route).recover(handle_custom))
+        .run(address)
+        .await;
+
+    Ok(())
+}
diff --git a/third_party/rust/warp/examples/dir.rs b/third_party/rust/warp/examples/dir.rs
new file mode 100644
index 0000000000..30261a220e
--- /dev/null
+++ b/third_party/rust/warp/examples/dir.rs
@@ -0,0 +1,10 @@
+#![deny(warnings)]
+
+#[tokio::main]
+async fn main() {
+    pretty_env_logger::init();
+
+    warp::serve(warp::fs::dir("examples/dir"))
+        .run(([127, 0, 0, 1], 3030))
+        .await;
+}
diff --git a/third_party/rust/warp/examples/dir/another.html b/third_party/rust/warp/examples/dir/another.html
new file mode 100644
index 0000000000..941c9a5937
--- /dev/null
+++ b/third_party/rust/warp/examples/dir/another.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <title>dir/another.html</title>
+    </head>
+    <body>
+        <h1>Welcome to Another Page</h1>
+        <a href="/">back</a>
+    </body>
+</html>
\ No newline at end of file
diff --git a/third_party/rust/warp/examples/dir/index.html b/third_party/rust/warp/examples/dir/index.html
new file mode 100644
index 0000000000..cb86323446
--- /dev/null
+++ b/third_party/rust/warp/examples/dir/index.html
@@ -0,0 +1,10 @@
+<!DOCTYPE html>
+<html>
+    <head>
+        <title>dir/index.html</title>
+    </head>
+    <body>
+        <h1>Welcome to Dir</h1>
+        <a href="/another.html">another page</a>
+    </body>
+</html>
\ No newline at end of file
diff --git a/third_party/rust/warp/examples/dyn_reply.rs b/third_party/rust/warp/examples/dyn_reply.rs
new file mode 100644
index 0000000000..4f59cf8ba9
--- /dev/null
+++ b/third_party/rust/warp/examples/dyn_reply.rs
@@ -0,0 +1,17 @@
+#![deny(warnings)]
+use warp::{http::StatusCode, Filter};
+
+async fn dyn_reply(word: String) -> Result<Box<dyn warp::Reply>, warp::Rejection> {
+    if &word == "hello" {
+        Ok(Box::new("world"))
+    } else {
+        Ok(Box::new(StatusCode::BAD_REQUEST))
+    }
+}
+
+#[tokio::main]
+async fn main() {
+    let routes = warp::path::param().and_then(dyn_reply);
+
+    warp::serve(routes).run(([127, 0, 0, 1], 3030)).await;
+}
diff --git a/third_party/rust/warp/examples/file.rs b/third_party/rust/warp/examples/file.rs
new file mode 100644
index 0000000000..a0cf2afa45
--- /dev/null
+++ b/third_party/rust/warp/examples/file.rs
@@ -0,0 +1,21 @@
+#![deny(warnings)]
+
+use warp::Filter;
+
+#[tokio::main]
+async fn main() {
+    pretty_env_logger::init();
+
+    let readme = warp::get()
+        .and(warp::path::end())
+        .and(warp::fs::file("./README.md"));
+
+    // dir already requires GET...
+    let examples = warp::path("ex").and(warp::fs::dir("./examples/"));
+
+    // GET / => README.md
+    // GET /ex/... => ./examples/..
+    let routes = readme.or(examples);
+
+    warp::serve(routes).run(([127, 0, 0, 1], 3030)).await;
+}
diff --git a/third_party/rust/warp/examples/futures.rs b/third_party/rust/warp/examples/futures.rs
new file mode 100644
index 0000000000..43bf2f6efa
--- /dev/null
+++ b/third_party/rust/warp/examples/futures.rs
@@ -0,0 +1,37 @@
+#![deny(warnings)]
+
+use std::convert::Infallible;
+use std::str::FromStr;
+use std::time::Duration;
+use warp::Filter;
+
+#[tokio::main]
+async fn main() {
+    // Match `/:Seconds`...
+    let routes = warp::path::param()
+        // and_then create a `Future` that will simply wait N seconds...
+        .and_then(sleepy);
+
+    warp::serve(routes).run(([127, 0, 0, 1], 3030)).await;
+}
+
+async fn sleepy(Seconds(seconds): Seconds) -> Result<impl warp::Reply, Infallible> {
+    tokio::time::sleep(Duration::from_secs(seconds)).await;
+    Ok(format!("I waited {} seconds!", seconds))
+}
+
+/// A newtype to enforce our maximum allowed seconds.
+struct Seconds(u64);
+
+impl FromStr for Seconds {
+    type Err = ();
+    fn from_str(src: &str) -> Result<Self, Self::Err> {
+        src.parse::<u64>().map_err(|_| ()).and_then(|num| {
+            if num <= 5 {
+                Ok(Seconds(num))
+            } else {
+                Err(())
+            }
+        })
+    }
+}
diff --git a/third_party/rust/warp/examples/handlebars_template.rs b/third_party/rust/warp/examples/handlebars_template.rs
new file mode 100644
index 0000000000..78e040539e
--- /dev/null
+++ b/third_party/rust/warp/examples/handlebars_template.rs
@@ -0,0 +1,58 @@
+#![deny(warnings)]
+use std::sync::Arc;
+
+use handlebars::Handlebars;
+use serde::Serialize;
+use serde_json::json;
+use warp::Filter;
+
+struct WithTemplate<T: Serialize> {
+    name: &'static str,
+    value: T,
+}
+
+fn render<T>(template: WithTemplate<T>, hbs: Arc<Handlebars<'_>>) -> impl warp::Reply
+where
+    T: Serialize,
+{
+    let render = hbs
+        .render(template.name, &template.value)
+        .unwrap_or_else(|err| err.to_string());
+    warp::reply::html(render)
+}
+
+#[tokio::main]
+async fn main() {
+    let template = "<!DOCTYPE html>
+                    <html>
+                      <head>
+                        <title>Warp Handlebars template example</title>
+                      </head>
+                      <body>
+                        <h1>Hello {{user}}!</h1>
+                      </body>
+                    </html>";
+
+    let mut hb = Handlebars::new();
+    // register the template
+    hb.register_template_string("template.html", template)
+        .unwrap();
+
+    // Turn Handlebars instance into a Filter so we can combine it
+    // easily with others...
+    let hb = Arc::new(hb);
+
+    // Create a reusable closure to render template
+    let handlebars = move |with_template| render(with_template, hb.clone());
+
+    //GET /
+    let route = warp::get()
+        .and(warp::path::end())
+        .map(|| WithTemplate {
+            name: "template.html",
+            value: json!({"user" : "Warp"}),
+        })
+        .map(handlebars);
+
+    warp::serve(route).run(([127, 0, 0, 1], 3030)).await;
+}
diff --git a/third_party/rust/warp/examples/headers.rs b/third_party/rust/warp/examples/headers.rs
new file mode 100644
index 0000000000..2b3dca7b50
--- /dev/null
+++ b/third_party/rust/warp/examples/headers.rs
@@ -0,0 +1,27 @@
+#![deny(warnings)]
+use std::net::SocketAddr;
+use warp::Filter;
+
+/// Create a server that requires header conditions:
+///
+/// - `Host` is a `SocketAddr`
+/// - `Accept` is exactly `*/*`
+///
+/// If these conditions don't match, a 404 is returned.
+#[tokio::main]
+async fn main() {
+    pretty_env_logger::init();
+
+    // For this example, we assume no DNS was used,
+    // so the Host header should be an address.
+    let host = warp::header::<SocketAddr>("host");
+
+    // Match when we get `accept: */*` exactly.
+    let accept_stars = warp::header::exact("accept", "*/*");
+
+    let routes = host
+        .and(accept_stars)
+        .map(|addr| format!("accepting stars on {}", addr));
+
+    warp::serve(routes).run(([127, 0, 0, 1], 3030)).await;
+}
diff --git a/third_party/rust/warp/examples/hello.rs b/third_party/rust/warp/examples/hello.rs
new file mode 100644
index 0000000000..27aa2e51c8
--- /dev/null
+++ b/third_party/rust/warp/examples/hello.rs
@@ -0,0 +1,10 @@
+#![deny(warnings)]
+use warp::Filter;
+
+#[tokio::main]
+async fn main() {
+    // Match any request and return hello world!
+    let routes = warp::any().map(|| "Hello, World!");
+
+    warp::serve(routes).run(([127, 0, 0, 1], 3030)).await;
+}
diff --git a/third_party/rust/warp/examples/query_string.rs b/third_party/rust/warp/examples/query_string.rs
new file mode 100644
index 0000000000..869468eb0d
--- /dev/null
+++ b/third_party/rust/warp/examples/query_string.rs
@@ -0,0 +1,59 @@
+use serde_derive::{Deserialize, Serialize};
+use std::collections::HashMap;
+use warp::{
+    http::{Response, StatusCode},
+    Filter,
+};
+
+#[derive(Deserialize, Serialize)]
+struct MyObject {
+    key1: String,
+    key2: u32,
+}
+
+#[tokio::main]
+async fn main() {
+    pretty_env_logger::init();
+
+    // get /example1?key=value
+    // demonstrates an optional parameter.
+    let example1 = warp::get()
+        .and(warp::path("example1"))
+        .and(warp::query::<HashMap<String, String>>())
+        .map(|p: HashMap<String, String>| match p.get("key") {
+            Some(key) => Response::builder().body(format!("key = {}", key)),
+            None => Response::builder().body(String::from("No \"key\" param in query.")),
+        });
+
+    // get /example2?key1=value&key2=42
+    // uses the query string to populate a custom object
+    let example2 = warp::get()
+        .and(warp::path("example2"))
+        .and(warp::query::<MyObject>())
+        .map(|p: MyObject| {
+            Response::builder().body(format!("key1 = {}, key2 = {}", p.key1, p.key2))
+        });
+
+    let opt_query = warp::query::<MyObject>()
+        .map(Some)
+        .or_else(|_| async { Ok::<(Option<MyObject>,), std::convert::Infallible>((None,)) });
+
+    // get /example3?key1=value&key2=42
+    // builds on example2 but adds custom error handling
+    let example3 =
+        warp::get()
+            .and(warp::path("example3"))
+            .and(opt_query)
+            .map(|p: Option<MyObject>| match p {
+                Some(obj) => {
+                    Response::builder().body(format!("key1 = {}, key2 = {}", obj.key1, obj.key2))
+                }
+                None => Response::builder()
+                    .status(StatusCode::BAD_REQUEST)
+                    .body(String::from("Failed to decode query param.")),
+            });
+
+    warp::serve(example1.or(example2).or(example3))
+        .run(([127, 0, 0, 1], 3030))
+        .await
+}
diff --git a/third_party/rust/warp/examples/rejections.rs b/third_party/rust/warp/examples/rejections.rs
new file mode 100644
index 0000000000..721e69ecaa
--- /dev/null
+++ b/third_party/rust/warp/examples/rejections.rs
@@ -0,0 +1,122 @@
+#![deny(warnings)]
+
+use std::convert::Infallible;
+use std::error::Error;
+use std::num::NonZeroU16;
+
+use serde_derive::{Deserialize, Serialize};
+use warp::http::StatusCode;
+use warp::{reject, Filter, Rejection, Reply};
+
+/// Rejections represent cases where a filter should not continue processing
+/// the request, but a different filter *could* process it.
+#[tokio::main]
+async fn main() {
+    let math = warp::path!("math" / u16);
+    let div_with_header = math
+        .and(warp::get())
+        .and(div_by())
+        .map(|num: u16, denom: NonZeroU16| {
+            warp::reply::json(&Math {
+                op: format!("{} / {}", num, denom),
+                output: num / denom.get(),
+            })
+        });
+
+    let div_with_body =
+        math.and(warp::post())
+            .and(warp::body::json())
+            .map(|num: u16, body: DenomRequest| {
+                warp::reply::json(&Math {
+                    op: format!("{} / {}", num, body.denom),
+                    output: num / body.denom.get(),
+                })
+            });
+
+    let routes = div_with_header.or(div_with_body).recover(handle_rejection);
+
+    warp::serve(routes).run(([127, 0, 0, 1], 3030)).await;
+}
+
+/// Extract a denominator from a "div-by" header, or reject with DivideByZero.
+fn div_by() -> impl Filter<Extract = (NonZeroU16,), Error = Rejection> + Copy {
+    warp::header::<u16>("div-by").and_then(|n: u16| async move {
+        if let Some(denom) = NonZeroU16::new(n) {
+            Ok(denom)
+        } else {
+            Err(reject::custom(DivideByZero))
+        }
+    })
+}
+
+#[derive(Deserialize)]
+struct DenomRequest {
+    pub denom: NonZeroU16,
+}
+
+#[derive(Debug)]
+struct DivideByZero;
+
+impl reject::Reject for DivideByZero {}
+
+// JSON replies
+
+/// A successful math operation.
+#[derive(Serialize)]
+struct Math {
+    op: String,
+    output: u16,
+}
+
+/// An API error serializable to JSON.
+#[derive(Serialize)]
+struct ErrorMessage {
+    code: u16,
+    message: String,
+}
+
+// This function receives a `Rejection` and tries to return a custom
+// value, otherwise simply passes the rejection along.
+async fn handle_rejection(err: Rejection) -> Result<impl Reply, Infallible> {
+    let code;
+    let message;
+
+    if err.is_not_found() {
+        code = StatusCode::NOT_FOUND;
+        message = "NOT_FOUND";
+    } else if let Some(DivideByZero) = err.find() {
+        code = StatusCode::BAD_REQUEST;
+        message = "DIVIDE_BY_ZERO";
+    } else if let Some(e) = err.find::<warp::filters::body::BodyDeserializeError>() {
+        // This error happens if the body could not be deserialized correctly
+        // We can use the cause to analyze the error and customize the error message
+        message = match e.source() {
+            Some(cause) => {
+                if cause.to_string().contains("denom") {
+                    "FIELD_ERROR: denom"
+                } else {
+                    "BAD_REQUEST"
+                }
+            }
+            None => "BAD_REQUEST",
+        };
+        code = StatusCode::BAD_REQUEST;
+    } else if let Some(_) = err.find::<warp::reject::MethodNotAllowed>() {
+        // We can handle a specific error, here METHOD_NOT_ALLOWED,
+        // and render it however we want
+        code = StatusCode::METHOD_NOT_ALLOWED;
+        message = "METHOD_NOT_ALLOWED";
+    } else {
+        // We should have expected this... Just log and say its a 500
+        eprintln!("unhandled rejection: {:?}", err);
+        code = StatusCode::INTERNAL_SERVER_ERROR;
+        message = "UNHANDLED_REJECTION";
+    }
+
+    let json = warp::reply::json(&ErrorMessage {
+        code: code.as_u16(),
+        message: message.into(),
+    });
+
+    Ok(warp::reply::with_status(json, code))
+}
diff --git a/third_party/rust/warp/examples/returning.rs b/third_party/rust/warp/examples/returning.rs
new file mode 100644
index 0000000000..f4f61e60fc
--- /dev/null
+++ b/third_party/rust/warp/examples/returning.rs
@@ -0,0 +1,20 @@
+use warp::{filters::BoxedFilter, Filter, Rejection, Reply};
+
+// Option 1: BoxedFilter
+// Note that this may be useful for shortening compile times when you are composing many filters.
+// Boxing the filters will use dynamic dispatch and speed up compilation while
+// making it slightly slower at runtime.
+pub fn assets_filter() -> BoxedFilter<(impl Reply,)> {
+    warp::path("assets").and(warp::fs::dir("./assets")).boxed()
+}
+
+// Option 2: impl Filter + Clone
+pub fn index_filter() -> impl Filter<Extract = (&'static str,), Error = Rejection> + Clone {
+    warp::path::end().map(|| "Index page")
+}
+
+#[tokio::main]
+async fn main() {
+    let routes = index_filter().or(assets_filter());
+    warp::serve(routes).run(([127, 0, 0, 1], 3030)).await;
+}
diff --git a/third_party/rust/warp/examples/routing.rs b/third_party/rust/warp/examples/routing.rs
new file mode 100644
index 0000000000..b2ad8c278d
--- /dev/null
+++ b/third_party/rust/warp/examples/routing.rs
@@ -0,0 +1,104 @@
+#![deny(warnings)]
+
+use warp::Filter;
+
+#[tokio::main]
+async fn main() {
+    pretty_env_logger::init();
+
+    // We'll start simple, and gradually show how you combine these powers
+    // into super powers!
+
+    // GET /
+    let hello_world = warp::path::end().map(|| "Hello, World at root!");
+
+    // GET /hi
+    let hi = warp::path("hi").map(|| "Hello, World!");
+
+    // How about multiple segments? First, we could use the `path!` macro:
+    //
+    // GET /hello/from/warp
+    let hello_from_warp = warp::path!("hello" / "from" / "warp").map(|| "Hello from warp!");
+
+    // Fine, but how do I handle parameters in paths?
+    //
+    // GET /sum/:u32/:u32
+    let sum = warp::path!("sum" / u32 / u32).map(|a, b| format!("{} + {} = {}", a, b, a + b));
+
+    // Any type that implements FromStr can be used, and in any order:
+    //
+    // GET /:u16/times/:u16
+    let times =
+        warp::path!(u16 / "times" / u16).map(|a, b| format!("{} times {} = {}", a, b, a * b));
+
+    // Oh shoot, those math routes should be mounted at a different path,
+    // is that possible? Yep.
+    //
+    // GET /math/sum/:u32/:u32
+    // GET /math/:u16/times/:u16
+    let math = warp::path("math");
+    let _sum = math.and(sum);
+    let _times = math.and(times);
+
+    // What! And? What's that do?
+    //
+    // It combines the filters in a sort of "this and then that" order. In
+    // fact, it's exactly what the `path!` macro has been doing internally.
+    //
+    // GET /bye/:string
+    let bye = warp::path("bye")
+        .and(warp::path::param())
+        .map(|name: String| format!("Good bye, {}!", name));
+
+    // Ah, can filters do things besides `and`?
+    //
+    // Why, yes they can! They can also `or`! As you might expect, `or` creates
+    // a "this or else that" chain of filters. If the first doesn't succeed,
+    // then it tries the other.
+    //
+    // So, those `math` routes could have been mounted all as one, with `or`.
+    //
+    // GET /math/sum/:u32/:u32
+    // GET /math/:u16/times/:u16
+    let math = warp::path("math").and(sum.or(times));
+
+    // We can use the end() filter to match a shorter path
+    let help = warp::path("math")
+        // Careful! Omitting the following line would make this filter match
+        // requests to /math/sum/:u32/:u32 and /math/:u16/times/:u16
+        .and(warp::path::end())
+        .map(|| "This is the Math API. Try calling /math/sum/:u32/:u32 or /math/:u16/times/:u16");
+    let math = help.or(math);
+
+    // Let's let people know that the `sum` and `times` routes are under `math`.
+    let sum = sum.map(|output| format!("(This route has moved to /math/sum/:u16/:u16) {}", output));
+    let times =
+        times.map(|output| format!("(This route has moved to /math/:u16/times/:u16) {}", output));
+
+    // It turns out, using `or` is how you combine everything together into
+    // a single API. (We also actually haven't been enforcing that the
+    // method is GET, so we'll do that too!)
+    //
+    // GET /
+    // GET /hi
+    // GET /hello/from/warp
+    // GET /bye/:string
+    // GET /math/sum/:u32/:u32
+    // GET /math/:u16/times/:u16
+
+    let routes = warp::get().and(
+        hello_world
+            .or(hi)
+            .or(hello_from_warp)
+            .or(bye)
+            .or(math)
+            .or(sum)
+            .or(times),
+    );
+
+    // Note that composing filters for many routes may increase compile times (because it uses a lot of generics).
+    // If you wish to use dynamic dispatch instead and speed up compile times while
+    // making it slightly slower at runtime, you can use Filter::boxed().
+
+    warp::serve(routes).run(([127, 0, 0, 1], 3030)).await;
+}
diff --git a/third_party/rust/warp/examples/sse.rs b/third_party/rust/warp/examples/sse.rs
new file mode 100644
index 0000000000..bce1fb6b1a
--- /dev/null
+++ b/third_party/rust/warp/examples/sse.rs
@@ -0,0 +1,31 @@
+use futures_util::StreamExt;
+use std::convert::Infallible;
+use std::time::Duration;
+use tokio::time::interval;
+use tokio_stream::wrappers::IntervalStream;
+use warp::{sse::Event, Filter};
+
+// create server-sent event
+fn sse_counter(counter: u64) -> Result<Event, Infallible> {
+    Ok(warp::sse::Event::default().data(counter.to_string()))
+}
+
+#[tokio::main]
+async fn main() {
+    pretty_env_logger::init();
+
+    let routes = warp::path("ticks").and(warp::get()).map(|| {
+        let mut counter: u64 = 0;
+        // create server event source
+        let interval = interval(Duration::from_secs(1));
+        let stream = IntervalStream::new(interval);
+        let event_stream = stream.map(move |_| {
+            counter += 1;
+            sse_counter(counter)
+        });
+        // reply using server-sent events
+        warp::sse::reply(event_stream)
+    });
+
+    warp::serve(routes).run(([127, 0, 0, 1], 3030)).await;
+}
diff --git a/third_party/rust/warp/examples/sse_chat.rs b/third_party/rust/warp/examples/sse_chat.rs
new file mode 100644
index 0000000000..6e064b1824
--- /dev/null
+++ b/third_party/rust/warp/examples/sse_chat.rs
@@ -0,0 +1,163 @@
+use futures_util::{Stream, StreamExt};
+use std::collections::HashMap;
+use std::sync::{
+    atomic::{AtomicUsize, Ordering},
+    Arc, Mutex,
+};
+use tokio::sync::mpsc;
+use tokio_stream::wrappers::UnboundedReceiverStream;
+use warp::{sse::Event, Filter};
+
+#[tokio::main]
+async fn main() {
+    pretty_env_logger::init();
+
+    // Keep track of all connected users, key is usize, value
+    // is an event stream sender.
+    let users = Arc::new(Mutex::new(HashMap::new()));
+    // Turn our "state" into a new Filter...
+    let users = warp::any().map(move || users.clone());
+
+    // POST /chat -> send message
+    let chat_send = warp::path("chat")
+        .and(warp::post())
+        .and(warp::path::param::<usize>())
+        .and(warp::body::content_length_limit(500))
+        .and(
+            warp::body::bytes().and_then(|body: bytes::Bytes| async move {
+                std::str::from_utf8(&body)
+                    .map(String::from)
+                    .map_err(|_e| warp::reject::custom(NotUtf8))
+            }),
+        )
+        .and(users.clone())
+        .map(|my_id, msg, users| {
+            user_message(my_id, msg, &users);
+            warp::reply()
+        });
+
+    // GET /chat -> messages stream
+    let chat_recv = warp::path("chat").and(warp::get()).and(users).map(|users| {
+        // reply using server-sent events
+        let stream = user_connected(users);
+        warp::sse::reply(warp::sse::keep_alive().stream(stream))
+    });
+
+    // GET / -> index html
+    let index = warp::path::end().map(|| {
+        warp::http::Response::builder()
+            .header("content-type", "text/html; charset=utf-8")
+            .body(INDEX_HTML)
+    });
+
+    let routes = index.or(chat_recv).or(chat_send);
+
+    warp::serve(routes).run(([127, 0, 0, 1], 3030)).await;
+}
+
+/// Our global unique user id counter.
+static NEXT_USER_ID: AtomicUsize = AtomicUsize::new(1);
+
+/// Message variants.
+#[derive(Debug)]
+enum Message {
+    UserId(usize),
+    Reply(String),
+}
+
+#[derive(Debug)]
+struct NotUtf8;
+impl warp::reject::Reject for NotUtf8 {}
+
+/// Our state of currently connected users.
+///
+/// - Key is their id
+/// - Value is a sender of `Message`
+type Users = Arc<Mutex<HashMap<usize, mpsc::UnboundedSender<Message>>>>;
+
+fn user_connected(users: Users) -> impl Stream<Item = Result<Event, warp::Error>> + Send + 'static {
+    // Use a counter to assign a new unique ID for this user.
+    let my_id = NEXT_USER_ID.fetch_add(1, Ordering::Relaxed);
+
+    eprintln!("new chat user: {}", my_id);
+
+    // Use an unbounded channel to handle buffering and flushing of messages
+    // to the event source...
+    let (tx, rx) = mpsc::unbounded_channel();
+    let rx = UnboundedReceiverStream::new(rx);
+
+    tx.send(Message::UserId(my_id))
+        // rx is right above, so this cannot fail
+        .unwrap();
+
+    // Save the sender in our list of connected users.
+    users.lock().unwrap().insert(my_id, tx);
+
+    // Convert messages into Server-Sent Events and return resulting stream.
+    rx.map(|msg| match msg {
+        Message::UserId(my_id) => Ok(Event::default().event("user").data(my_id.to_string())),
+        Message::Reply(reply) => Ok(Event::default().data(reply)),
+    })
+}
+
+fn user_message(my_id: usize, msg: String, users: &Users) {
+    let new_msg = format!("<User#{}>: {}", my_id, msg);
+
+    // New message from this user, send it to everyone else (except same uid)...
+    //
+    // We use `retain` instead of a for loop so that we can reap any user that
+    // appears to have disconnected.
+    users.lock().unwrap().retain(|uid, tx| {
+        if my_id == *uid {
+            // don't send to same user, but do retain
+            true
+        } else {
+            // If not `is_ok`, the SSE stream is gone, and so don't retain
+            tx.send(Message::Reply(new_msg.clone())).is_ok()
+        }
+    });
+}
+
+static INDEX_HTML: &str = r#"
+<!DOCTYPE html>
+<html>
+    <head>
+        <title>Warp Chat</title>
+    </head>
+    <body>
+        <h1>warp chat</h1>
+        <div id="chat">
+            <p><em>Connecting...</em></p>
+        </div>
+        <input type="text" id="text" />
+        <button type="button" id="send">Send</button>
+        <script type="text/javascript">
+        var uri = 'http://' + location.host + '/chat';
+        var sse = new EventSource(uri);
+        function message(data) {
+            var line = document.createElement('p');
+            line.innerText = data;
+            chat.appendChild(line);
+        }
+        sse.onopen = function() {
+            chat.innerHTML = "<p><em>Connected!</em></p>";
+        }
+        var user_id;
+        sse.addEventListener("user", function(msg) {
+            user_id = msg.data;
+        });
+        sse.onmessage = function(msg) {
+            message(msg.data);
+        };
+        send.onclick = function() {
+            var msg = text.value;
+            var xhr = new XMLHttpRequest();
+            xhr.open("POST", uri + '/' + user_id, true);
+            xhr.send(msg);
+            text.value = '';
+            message('<You>: ' + msg);
+        };
+        </script>
+    </body>
+</html>
+"#;
diff --git a/third_party/rust/warp/examples/tls.rs b/third_party/rust/warp/examples/tls.rs
new file mode 100644
index 0000000000..7d28e03a3a
--- /dev/null
+++ b/third_party/rust/warp/examples/tls.rs
@@ -0,0 +1,25 @@
+#![deny(warnings)]
+
+// Don't copy this `cfg`, it's only needed because this file is within
+// the warp repository.
+// Instead, specify the "tls" feature in your warp dependency declaration.
+#[cfg(feature = "tls")]
+#[tokio::main]
+async fn main() {
+    use warp::Filter;
+
+    // Match any request and return hello world!
+    let routes = warp::any().map(|| "Hello, World!");
+
+    warp::serve(routes)
+        .tls()
+        .cert_path("examples/tls/cert.pem")
+        .key_path("examples/tls/key.rsa")
+        .run(([127, 0, 0, 1], 3030))
+        .await;
+}
+
+#[cfg(not(feature = "tls"))]
+fn main() {
+    eprintln!("Requires the `tls` feature.");
+}
diff --git a/third_party/rust/warp/examples/tls/cert.pem b/third_party/rust/warp/examples/tls/cert.pem
new file mode 100644
index 0000000000..03af12ff81
--- /dev/null
+++ b/third_party/rust/warp/examples/tls/cert.pem
@@ -0,0 +1,24 @@
+-----BEGIN CERTIFICATE-----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+-----END CERTIFICATE-----
diff --git a/third_party/rust/warp/examples/tls/key.rsa b/third_party/rust/warp/examples/tls/key.rsa
new file mode 100644
index 0000000000..b13bf5d07f
--- /dev/null
+++ b/third_party/rust/warp/examples/tls/key.rsa
@@ -0,0 +1,27 @@
+-----BEGIN RSA PRIVATE KEY-----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+-----END RSA PRIVATE KEY-----
diff --git a/third_party/rust/warp/examples/todos.rs b/third_party/rust/warp/examples/todos.rs
new file mode 100644
index 0000000000..904d604e8f
--- /dev/null
+++ b/third_party/rust/warp/examples/todos.rs
@@ -0,0 +1,291 @@
+#![deny(warnings)]
+
+use std::env;
+use warp::Filter;
+
+/// Provides a RESTful web server managing some Todos.
+///
+/// API will be:
+///
+/// - `GET /todos`: return a JSON list of Todos.
+/// - `POST /todos`: create a new Todo.
+/// - `PUT /todos/:id`: update a specific Todo.
+/// - `DELETE /todos/:id`: delete a specific Todo.
+#[tokio::main]
+async fn main() {
+    if env::var_os("RUST_LOG").is_none() {
+        // Set `RUST_LOG=todos=debug` to see debug logs,
+        // this only shows access logs.
+        env::set_var("RUST_LOG", "todos=info");
+    }
+    pretty_env_logger::init();
+
+    let db = models::blank_db();
+
+    let api = filters::todos(db);
+
+    // View access logs by setting `RUST_LOG=todos`.
+    let routes = api.with(warp::log("todos"));
+    // Start up the server...
+    warp::serve(routes).run(([127, 0, 0, 1], 3030)).await;
+}
+
+mod filters {
+    use super::handlers;
+    use super::models::{Db, ListOptions, Todo};
+    use warp::Filter;
+
+    /// The 4 TODOs filters combined.
+    pub fn todos(
+        db: Db,
+    ) -> impl Filter<Extract = impl warp::Reply, Error = warp::Rejection> + Clone {
+        todos_list(db.clone())
+            .or(todos_create(db.clone()))
+            .or(todos_update(db.clone()))
+            .or(todos_delete(db))
+    }
+
+    /// GET /todos?offset=3&limit=5
+    pub fn todos_list(
+        db: Db,
+    ) -> impl Filter<Extract = impl warp::Reply, Error = warp::Rejection> + Clone {
+        warp::path!("todos")
+            .and(warp::get())
+            .and(warp::query::<ListOptions>())
+            .and(with_db(db))
+            .and_then(handlers::list_todos)
+    }
+
+    /// POST /todos with JSON body
+    pub fn todos_create(
+        db: Db,
+    ) -> impl Filter<Extract = impl warp::Reply, Error = warp::Rejection> + Clone {
+        warp::path!("todos")
+            .and(warp::post())
+            .and(json_body())
+            .and(with_db(db))
+            .and_then(handlers::create_todo)
+    }
+
+    /// PUT /todos/:id with JSON body
+    pub fn todos_update(
+        db: Db,
+    ) -> impl Filter<Extract = impl warp::Reply, Error = warp::Rejection> + Clone {
+        warp::path!("todos" / u64)
+            .and(warp::put())
+            .and(json_body())
+            .and(with_db(db))
+            .and_then(handlers::update_todo)
+    }
+
+    /// DELETE /todos/:id
+    pub fn todos_delete(
+        db: Db,
+    ) -> impl Filter<Extract = impl warp::Reply, Error = warp::Rejection> + Clone {
+        // We'll make one of our endpoints admin-only to show how authentication filters are used
+        let admin_only = warp::header::exact("authorization", "Bearer admin");
+
+        warp::path!("todos" / u64)
+            // It is important to put the auth check _after_ the path filters.
+            // If we put the auth check before, the request `PUT /todos/invalid-string`
+            // would try this filter and reject because the authorization header doesn't match,
+            // rather because the param is wrong for that other path.
+            .and(admin_only)
+            .and(warp::delete())
+            .and(with_db(db))
+            .and_then(handlers::delete_todo)
+    }
+
+    fn with_db(db: Db) -> impl Filter<Extract = (Db,), Error = std::convert::Infallible> + Clone {
+        warp::any().map(move || db.clone())
+    }
+
+    fn json_body() -> impl Filter<Extract = (Todo,), Error = warp::Rejection> + Clone {
+        // When accepting a body, we want a JSON body
+        // (and to reject huge payloads)...
+        warp::body::content_length_limit(1024 * 16).and(warp::body::json())
+    }
+}
+
+/// These are our API handlers, the ends of each filter chain.
+/// Notice how thanks to using `Filter::and`, we can define a function
+/// with the exact arguments we'd expect from each filter in the chain.
+/// No tuples are needed, it's auto flattened for the functions.
+mod handlers {
+    use super::models::{Db, ListOptions, Todo};
+    use std::convert::Infallible;
+    use warp::http::StatusCode;
+
+    pub async fn list_todos(opts: ListOptions, db: Db) -> Result<impl warp::Reply, Infallible> {
+        // Just return a JSON array of todos, applying the limit and offset.
+        let todos = db.lock().await;
+        let todos: Vec<Todo> = todos
+            .clone()
+            .into_iter()
+            .skip(opts.offset.unwrap_or(0))
+            .take(opts.limit.unwrap_or(std::usize::MAX))
+            .collect();
+        Ok(warp::reply::json(&todos))
+    }
+
+    pub async fn create_todo(create: Todo, db: Db) -> Result<impl warp::Reply, Infallible> {
+        log::debug!("create_todo: {:?}", create);
+
+        let mut vec = db.lock().await;
+
+        for todo in vec.iter() {
+            if todo.id == create.id {
+                log::debug!("    -> id already exists: {}", create.id);
+                // Todo with id already exists, return `400 BadRequest`.
+                return Ok(StatusCode::BAD_REQUEST);
+            }
+        }
+
+        // No existing Todo with id, so insert and return `201 Created`.
+        vec.push(create);
+
+        Ok(StatusCode::CREATED)
+    }
+
+    pub async fn update_todo(
+        id: u64,
+        update: Todo,
+        db: Db,
+    ) -> Result<impl warp::Reply, Infallible> {
+        log::debug!("update_todo: id={}, todo={:?}", id, update);
+        let mut vec = db.lock().await;
+
+        // Look for the specified Todo...
+        for todo in vec.iter_mut() {
+            if todo.id == id {
+                *todo = update;
+                return Ok(StatusCode::OK);
+            }
+        }
+
+        log::debug!("    -> todo id not found!");
+
+        // If the for loop didn't return OK, then the ID doesn't exist...
+        Ok(StatusCode::NOT_FOUND)
+    }
+
+    pub async fn delete_todo(id: u64, db: Db) -> Result<impl warp::Reply, Infallible> {
+        log::debug!("delete_todo: id={}", id);
+
+        let mut vec = db.lock().await;
+
+        let len = vec.len();
+        vec.retain(|todo| {
+            // Retain all Todos that aren't this id...
+            // In other words, remove all that *are* this id...
+            todo.id != id
+        });
+
+        // If the vec is smaller, we found and deleted a Todo!
+        let deleted = vec.len() != len;
+
+        if deleted {
+            // respond with a `204 No Content`, which means successful,
+            // yet no body expected...
+            Ok(StatusCode::NO_CONTENT)
+        } else {
+            log::debug!("    -> todo id not found!");
+            Ok(StatusCode::NOT_FOUND)
+        }
+    }
+}
+
+mod models {
+    use serde_derive::{Deserialize, Serialize};
+    use std::sync::Arc;
+    use tokio::sync::Mutex;
+
+    /// So we don't have to tackle how different database work, we'll just use
+    /// a simple in-memory DB, a vector synchronized by a mutex.
+    pub type Db = Arc<Mutex<Vec<Todo>>>;
+
+    pub fn blank_db() -> Db {
+        Arc::new(Mutex::new(Vec::new()))
+    }
+
+    #[derive(Debug, Deserialize, Serialize, Clone)]
+    pub struct Todo {
+        pub id: u64,
+        pub text: String,
+        pub completed: bool,
+    }
+
+    // The query parameters for list_todos.
+    #[derive(Debug, Deserialize)]
+    pub struct ListOptions {
+        pub offset: Option<usize>,
+        pub limit: Option<usize>,
+    }
+}
+
+#[cfg(test)]
+mod tests {
+    use warp::http::StatusCode;
+    use warp::test::request;
+
+    use super::{
+        filters,
+        models::{self, Todo},
+    };
+
+    #[tokio::test]
+    async fn test_post() {
+        let db = models::blank_db();
+        let api = filters::todos(db);
+
+        let resp = request()
+            .method("POST")
+            .path("/todos")
+            .json(&todo1())
+            .reply(&api)
+            .await;
+
+        assert_eq!(resp.status(), StatusCode::CREATED);
+    }
+
+    #[tokio::test]
+    async fn test_post_conflict() {
+        let db = models::blank_db();
+        db.lock().await.push(todo1());
+        let api = filters::todos(db);
+
+        let resp = request()
+            .method("POST")
+            .path("/todos")
+            .json(&todo1())
+            .reply(&api)
+            .await;
+
+        assert_eq!(resp.status(), StatusCode::BAD_REQUEST);
+    }
+
+    #[tokio::test]
+    async fn test_put_unknown() {
+        let _ = pretty_env_logger::try_init();
+        let db = models::blank_db();
+        let api = filters::todos(db);
+
+        let resp = request()
+            .method("PUT")
+            .path("/todos/1")
+            .header("authorization", "Bearer admin")
+            .json(&todo1())
+            .reply(&api)
+            .await;
+
+        assert_eq!(resp.status(), StatusCode::NOT_FOUND);
+    }
+
+    fn todo1() -> Todo {
+        Todo {
+            id: 1,
+            text: "test 1".into(),
+            completed: false,
+        }
+    }
+}
diff --git a/third_party/rust/warp/examples/tracing.rs b/third_party/rust/warp/examples/tracing.rs
new file mode 100644
index 0000000000..103f747a93
--- /dev/null
+++ b/third_party/rust/warp/examples/tracing.rs
@@ -0,0 +1,59 @@
+//! [`tracing`] is a framework for instrumenting Rust programs to
+//! collect scoped, structured, and async-aware diagnostics. This example
+//! demonstrates how the `warp::trace` module can be used to instrument `warp`
+//! applications with `tracing`.
+//!
+//! [`tracing`]: https://crates.io/crates/tracing
+#![deny(warnings)]
+use tracing_subscriber::fmt::format::FmtSpan;
+use warp::Filter;
+
+#[tokio::main]
+async fn main() {
+    // Filter traces based on the RUST_LOG env var, or, if it's not set,
+    // default to show the output of the example.
+    let filter = std::env::var("RUST_LOG").unwrap_or_else(|_| "tracing=info,warp=debug".to_owned());
+
+    // Configure the default `tracing` subscriber.
+    // The `fmt` subscriber from the `tracing-subscriber` crate logs `tracing`
+    // events to stdout. Other subscribers are available for integrating with
+    // distributed tracing systems such as OpenTelemetry.
+    tracing_subscriber::fmt()
+        // Use the filter we built above to determine which traces to record.
+        .with_env_filter(filter)
+        // Record an event when each span closes. This can be used to time our
+        // routes' durations!
+        .with_span_events(FmtSpan::CLOSE)
+        .init();
+
+    let hello = warp::path("hello")
+        .and(warp::get())
+        // When the `hello` route is called, emit a `tracing` event.
+        .map(|| {
+            tracing::info!("saying hello...");
+            "Hello, World!"
+        })
+        // Wrap the route in a `tracing` span to add the route's name as context
+        // to any events that occur inside it.
+        .with(warp::trace::named("hello"));
+
+    let goodbye = warp::path("goodbye")
+        .and(warp::get())
+        .map(|| {
+            tracing::info!("saying goodbye...");
+            "So long and thanks for all the fish!"
+        })
+        // We can also provide our own custom `tracing` spans to wrap a route.
+        .with(warp::trace(|info| {
+            // Construct our own custom span for this route.
+            tracing::info_span!("goodbye", req.path = ?info.path())
+        }));
+
+    let routes = hello
+        .or(goodbye)
+        // Wrap all the routes with a filter that creates a `tracing` span for
+        // each request we receive, including data about the request.
+        .with(warp::trace::request());
+
+    warp::serve(routes).run(([127, 0, 0, 1], 3030)).await;
+}
diff --git a/third_party/rust/warp/examples/unix_socket.rs b/third_party/rust/warp/examples/unix_socket.rs
new file mode 100644
index 0000000000..521aeead21
--- /dev/null
+++ b/third_party/rust/warp/examples/unix_socket.rs
@@ -0,0 +1,22 @@
+#![deny(warnings)]
+
+#[cfg(unix)]
+#[tokio::main]
+async fn main() {
+    use tokio::net::UnixListener;
+    use tokio_stream::wrappers::UnixListenerStream;
+
+    pretty_env_logger::init();
+
+    let listener = UnixListener::bind("/tmp/warp.sock").unwrap();
+    let incoming = UnixListenerStream::new(listener);
+    warp::serve(warp::fs::dir("examples/dir"))
+        .run_incoming(incoming)
+        .await;
+}
+
+#[cfg(not(unix))]
+#[tokio::main]
+async fn main() {
+    panic!("Must run under Unix-like platform!");
+}
diff --git a/third_party/rust/warp/examples/websockets.rs b/third_party/rust/warp/examples/websockets.rs
new file mode 100644
index 0000000000..b0de205743
--- /dev/null
+++ b/third_party/rust/warp/examples/websockets.rs
@@ -0,0 +1,27 @@
+#![deny(warnings)]
+
+use futures_util::{FutureExt, StreamExt};
+use warp::Filter;
+
+#[tokio::main]
+async fn main() {
+    pretty_env_logger::init();
+
+    let routes = warp::path("echo")
+        // The `ws()` filter will prepare the Websocket handshake.
+        .and(warp::ws())
+        .map(|ws: warp::ws::Ws| {
+            // And then our closure will be called when it completes...
+            ws.on_upgrade(|websocket| {
+                // Just echo all messages back...
+                let (tx, rx) = websocket.split();
+                rx.forward(tx).map(|result| {
+                    if let Err(e) = result {
+                        eprintln!("websocket error: {:?}", e);
+                    }
+                })
+            })
+        });
+
+    warp::serve(routes).run(([127, 0, 0, 1], 3030)).await;
+}
diff --git a/third_party/rust/warp/examples/websockets_chat.rs b/third_party/rust/warp/examples/websockets_chat.rs
new file mode 100644
index 0000000000..21e2286f6f
--- /dev/null
+++ b/third_party/rust/warp/examples/websockets_chat.rs
@@ -0,0 +1,175 @@
+// #![deny(warnings)]
+use std::collections::HashMap;
+use std::sync::{
+    atomic::{AtomicUsize, Ordering},
+    Arc,
+};
+
+use futures_util::{SinkExt, StreamExt, TryFutureExt};
+use tokio::sync::{mpsc, RwLock};
+use tokio_stream::wrappers::UnboundedReceiverStream;
+use warp::ws::{Message, WebSocket};
+use warp::Filter;
+
+/// Our global unique user id counter.
+static NEXT_USER_ID: AtomicUsize = AtomicUsize::new(1);
+
+/// Our state of currently connected users.
+///
+/// - Key is their id
+/// - Value is a sender of `warp::ws::Message`
+type Users = Arc<RwLock<HashMap<usize, mpsc::UnboundedSender<Message>>>>;
+
+#[tokio::main]
+async fn main() {
+    pretty_env_logger::init();
+
+    // Keep track of all connected users, key is usize, value
+    // is a websocket sender.
+    let users = Users::default();
+    // Turn our "state" into a new Filter...
+    let users = warp::any().map(move || users.clone());
+
+    // GET /chat -> websocket upgrade
+    let chat = warp::path("chat")
+        // The `ws()` filter will prepare Websocket handshake...
+        .and(warp::ws())
+        .and(users)
+        .map(|ws: warp::ws::Ws, users| {
+            // This will call our function if the handshake succeeds.
+            ws.on_upgrade(move |socket| user_connected(socket, users))
+        });
+
+    // GET / -> index html
+    let index = warp::path::end().map(|| warp::reply::html(INDEX_HTML));
+
+    let routes = index.or(chat);
+
+    warp::serve(routes).run(([127, 0, 0, 1], 3030)).await;
+}
+
+async fn user_connected(ws: WebSocket, users: Users) {
+    // Use a counter to assign a new unique ID for this user.
+    let my_id = NEXT_USER_ID.fetch_add(1, Ordering::Relaxed);
+
+    eprintln!("new chat user: {}", my_id);
+
+    // Split the socket into a sender and receive of messages.
+    let (mut user_ws_tx, mut user_ws_rx) = ws.split();
+
+    // Use an unbounded channel to handle buffering and flushing of messages
+    // to the websocket...
+    let (tx, rx) = mpsc::unbounded_channel();
+    let mut rx = UnboundedReceiverStream::new(rx);
+
+    tokio::task::spawn(async move {
+        while let Some(message) = rx.next().await {
+            user_ws_tx
+                .send(message)
+                .unwrap_or_else(|e| {
+                    eprintln!("websocket send error: {}", e);
+                })
+                .await;
+        }
+    });
+
+    // Save the sender in our list of connected users.
+    users.write().await.insert(my_id, tx);
+
+    // Return a `Future` that is basically a state machine managing
+    // this specific user's connection.
+
+    // Every time the user sends a message, broadcast it to
+    // all other users...
+    while let Some(result) = user_ws_rx.next().await {
+        let msg = match result {
+            Ok(msg) => msg,
+            Err(e) => {
+                eprintln!("websocket error(uid={}): {}", my_id, e);
+                break;
+            }
+        };
+        user_message(my_id, msg, &users).await;
+    }
+
+    // user_ws_rx stream will keep processing as long as the user stays
+    // connected. Once they disconnect, then...
+    user_disconnected(my_id, &users).await;
+}
+
+async fn user_message(my_id: usize, msg: Message, users: &Users) {
+    // Skip any non-Text messages...
+    let msg = if let Ok(s) = msg.to_str() {
+        s
+    } else {
+        return;
+    };
+
+    let new_msg = format!("<User#{}>: {}", my_id, msg);
+
+    // New message from this user, send it to everyone else (except same uid)...
+    for (&uid, tx) in users.read().await.iter() {
+        if my_id != uid {
+            if let Err(_disconnected) = tx.send(Message::text(new_msg.clone())) {
+                // The tx is disconnected, our `user_disconnected` code
+                // should be happening in another task, nothing more to
+                // do here.
+            }
+        }
+    }
+}
+
+async fn user_disconnected(my_id: usize, users: &Users) {
+    eprintln!("good bye user: {}", my_id);
+
+    // Stream closed up, so remove from the user list
+    users.write().await.remove(&my_id);
+}
+
+static INDEX_HTML: &str = r#"<!DOCTYPE html>
+<html lang="en">
+    <head>
+        <title>Warp Chat</title>
+    </head>
+    <body>
+        <h1>Warp chat</h1>
+        <div id="chat">
+            <p><em>Connecting...</em></p>
+        </div>
+        <input type="text" id="text" />
+        <button type="button" id="send">Send</button>
+        <script type="text/javascript">
+        const chat = document.getElementById('chat');
+        const text = document.getElementById('text');
+        const uri = 'ws://' + location.host + '/chat';
+        const ws = new WebSocket(uri);
+
+        function message(data) {
+            const line = document.createElement('p');
+            line.innerText = data;
+            chat.appendChild(line);
+        }
+
+        ws.onopen = function() {
+            chat.innerHTML = '<p><em>Connected!</em></p>';
+        };
+
+        ws.onmessage = function(msg) {
+            message(msg.data);
+        };
+
+        ws.onclose = function() {
+            chat.getElementsByTagName('em')[0].innerText = 'Disconnected!';
+        };
+
+        send.onclick = function() {
+            const msg = text.value;
+            ws.send(msg);
+            text.value = '';
+
+            message('<You>: ' + msg);
+        };
+        </script>
+    </body>
+</html>
+"#;
diff --git a/third_party/rust/warp/examples/wrapping.rs b/third_party/rust/warp/examples/wrapping.rs
new file mode 100644
index 0000000000..bfc84f980f
--- /dev/null
+++ b/third_party/rust/warp/examples/wrapping.rs
@@ -0,0 +1,31 @@
+#![deny(warnings)]
+use warp::Filter;
+
+fn hello_wrapper<F, T>(
+    filter: F,
+) -> impl Filter<Extract = (&'static str,)> + Clone + Send + Sync + 'static
+where
+    F: Filter<Extract = (T,), Error = std::convert::Infallible> + Clone + Send + Sync + 'static,
+    F::Extract: warp::Reply,
+{
+    warp::any()
+        .map(|| {
+            println!("before filter");
+        })
+        .untuple_one()
+        .and(filter)
+        .map(|_arg| "wrapped hello world")
+}
+
+#[tokio::main]
+async fn main() {
+    // Match any request and return hello world!
+    let routes = warp::any()
+        .map(|| "hello world")
+        .boxed()
+        .recover(|_err| async { Ok("recovered") })
+        // wrap the filter with hello_wrapper
+        .with(warp::wrap_fn(hello_wrapper));
+
+    warp::serve(routes).run(([127, 0, 0, 1], 3030)).await;
+}