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+ "anyhow",
+ "heck",
+ "indexmap",
+ "prettyplease",
+ "syn 2.0.109",
+ "wasm-metadata 0.235.0",
+ "wit-bindgen-core 0.43.0",
+ "wit-component 0.235.0",
+]
+
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+ "indexmap",
+ "prettyplease",
+ "syn 2.0.109",
+ "wasm-metadata 0.239.0",
+ "wit-bindgen-core 0.46.0",
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+]
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+ "anyhow",
+ "prettyplease",
+ "proc-macro2",
+ "quote",
+ "syn 2.0.109",
+ "wit-bindgen-core 0.43.0",
+ "wit-bindgen-rust 0.43.0",
+]
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+ "wit-bindgen-rust 0.46.0",
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+ "log",
+ "serde",
+ "serde_derive",
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+ "wasm-encoder 0.235.0",
+ "wasm-metadata 0.235.0",
+ "wasmparser 0.235.0",
+ "wit-parser 0.235.0",
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+ "wasm-metadata 0.239.0",
+ "wasmparser 0.239.0",
+ "wit-parser 0.239.0",
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+ "indexmap",
+ "log",
+ "semver",
+ "serde",
+ "serde_derive",
+ "serde_json",
+ "unicode-xid",
+ "wasmparser 0.235.0",
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+ "indexmap",
+ "log",
+ "semver",
+ "serde",
+ "serde_derive",
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+ "unicode-xid",
+ "wasmparser 0.239.0",
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+ "zerocopy-derive",
+]
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+[[package]]
+name = "zerocopy-derive"
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+ "proc-macro2",
+ "quote",
+ "syn 2.0.109",
+]
diff --git a/examples/wasip3-streaming/Cargo.toml b/examples/wasip3-streaming/Cargo.toml
new file mode 100644
index 0000000..03c6d09
--- /dev/null
+++ b/examples/wasip3-streaming/Cargo.toml
@@ -0,0 +1,20 @@
+[package]
+name = "wasip3-streaming"
+description = "Demonstrates streaming processing of requests and responses"
+version = "0.1.0"
+rust-version = "1.90"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+anyhow = "1"
+bytes = "1.10.1"
+futures = "0.3.31"
+http = "1.3"
+http-body = "1"
+http-body-util = "0.1.3"
+spin-sdk = { path = "../..", features = ["wasip3-unstable"] }
+
+[workspace]
diff --git a/examples/wasip3-streaming/spin.toml b/examples/wasip3-streaming/spin.toml
new file mode 100644
index 0000000..5dc7847
--- /dev/null
+++ b/examples/wasip3-streaming/spin.toml
@@ -0,0 +1,21 @@
+#:schema https://schemas.spinframework.dev/spin/manifest-v2/latest.json
+
+spin_manifest_version = 2
+
+[application]
+name = "wasip3-streaming"
+version = "0.1.0"
+authors = ["The Spin authors"]
+description = "Demonstrates streaming processing of requests and responses"
+
+[[trigger.http]]
+route = "/..."
+component = "wasip3-streaming"
+executor = { type = "wasip3-unstable" }
+
+[component.wasip3-streaming]
+source = "target/wasm32-wasip2/release/wasip3_streaming.wasm"
+allowed_outbound_hosts = []
+[component.wasip3-streaming.build]
+command = "cargo build --target wasm32-wasip2 --release"
+watch = ["src/**/*.rs", "Cargo.toml"]
diff --git a/examples/wasip3-streaming/src/lib.rs b/examples/wasip3-streaming/src/lib.rs
new file mode 100644
index 0000000..a9afa02
--- /dev/null
+++ b/examples/wasip3-streaming/src/lib.rs
@@ -0,0 +1,70 @@
+use spin_sdk::http_wasip3::body::IncomingBodyExt;
+use spin_sdk::http_wasip3::http_service;
+use spin_sdk::http_wasip3::{IntoResponse, Request};
+
+use bytes::Bytes;
+use futures::{
+    channel::mpsc::{channel, Sender},
+    SinkExt, StreamExt,
+};
+
+/// A streaming Spin HTTP component.
+///
+/// This component is an (almost) pure echo server: it streams the
+/// request body back to the client, with a start and end marker
+/// for UI visibility. A real service would of course process the
+/// request in some way!
+#[http_service]
+async fn handle_wasip3_streaming(request: Request) -> impl IntoResponse {
+    // We want to process the incoming body as a stream. This allows
+    // us to send the first bytes of the response without waiting
+    // for the request to arrive in full (and without requiring us to
+    // hold the whole request body in memory).
+    let mut in_body = request.into_body().stream();
+
+    // Create a streaming Body implementation that backs onto a `mpsc`
+    // channel. The function returns the sender side of the channel; the
+    // receiver end becomes the body. So anything written to the sender
+    // side will be sent out over the HTTP response.
+    let (mut tx, body) = bytes_stream_body();
+
+    // Use wit_bindgen::spawn to allow the async block to keep running
+    // after the handler returns.
+    spin_sdk::http_wasip3::wasip3::wit_bindgen::spawn(async move {
+        tx.send("-- INBOUND MESSAGE --\n".into()).await.unwrap();
+        // Keep processing data from the incoming body stream until it ends...
+        loop {
+            let Some(chunk) = in_body.next().await else {
+                break;
+            };
+            // and just copy that data to the response body stream. Each chunk
+            // is sent to the client immediately (for some value of immediately) -
+            // we do not wait to build up the whole response on the server.
+            tx.send(chunk.unwrap()).await.unwrap();
+        }
+        tx.send("\n---------------------\n".into()).await.unwrap();
+    });
+
+    // Return the streaming Response object. The async block continues
+    // to stream data into the response body despite the function returning.
+    http::Response::new(body)
+}
+
+// Helper function to create a streaming body.
+fn bytes_stream_body() -> (
+    Sender<bytes::Bytes>,
+    impl http_body::Body<Data = Bytes, Error = anyhow::Error>,
+) {
+    // The send and receive sides of a channel
+    let (tx, rx) = channel::<Bytes>(1024);
+    // The receive side is a stream, so we can use combinators like `map`
+    // to transform it into a form that the response plumbing is happy
+    // with. The app logic that writes to the stream doesn't need to see
+    // any of this.
+    let stm = rx.map(|value| Ok(http_body::Frame::data(value)));
+    // Construct a Body implementation over the stream.
+    let body = http_body_util::StreamBody::new(stm);
+    // Return the send side (so that app logic can write to the body) and the
+    // body (so it can be put in a Response!).
+    (tx, body)
+}