Add HTTP Rust template for wasip3-unstable (#3345)

Signed-off-by: Brian Hardock <[email protected]>

Author: fibonacci1729

crates/templates/src/manager.rs

@@ -566,7 +566,7 @@ mod tests {
         }
     }
 
-    const TPLS_IN_THIS: usize = 11;
+    const TPLS_IN_THIS: usize = 12;
 
     #[tokio::test]
     async fn can_install_into_new_directory() {

templates/http-rust-wasip3-unstable/content/.gitignore

@@ -0,0 +1,2 @@
+target/
+.spin/

templates/http-rust-wasip3-unstable/content/Cargo.toml.tmpl

@@ -0,0 +1,16 @@
+[package]
+name = "{{project-name | kebab_case}}"
+authors = ["{{authors}}"]
+description = "{{project-description}}"
+version = "0.1.0"
+rust-version = "1.90"
+edition = "2021"
+
+[lib]
+crate-type = ["cdylib"]
+
+[dependencies]
+anyhow = "1"
+spin-sdk = { version = "5.1.0", features = ["wasip3-unstable"] }
+
+[workspace]

templates/http-rust-wasip3-unstable/content/spin.toml

@@ -0,0 +1,21 @@
+#:schema https://schemas.spinframework.dev/spin/manifest-v2/latest.json
+
+spin_manifest_version = 2
+
+[application]
+name = "{{project-name | kebab_case}}"
+version = "0.1.0"
+authors = ["{{authors}}"]
+description = "{{project-description}}"
+
+[[trigger.http]]
+route = "{{http-path}}"
+component = "{{project-name | kebab_case}}"
+executor = { type = "wasip3-unstable" }
+
+[component.{{project-name | kebab_case}}]
+source = "target/wasm32-wasip2/release/{{project-name | snake_case}}.wasm"
+allowed_outbound_hosts = []
+[component.{{project-name | kebab_case}}.build]
+command = "cargo build --target wasm32-wasip2 --release"
+watch = ["src/**/*.rs", "Cargo.toml"]

templates/http-rust-wasip3-unstable/content/src/lib.rs

@@ -0,0 +1,7 @@
+use spin_sdk::http_wasip3::{http_service, IntoResponse, Request, Response};
+
+/// A simple Spin HTTP component.
+#[http_service]
+async fn handle_{{project-name | snake_case}}(_req: Request) -> impl IntoResponse {
+    Response::new("Hello, world!".to_string())
+}

templates/http-rust-wasip3-unstable/metadata/spin-template.toml

@@ -0,0 +1,13 @@
+manifest_version = "1"
+id = "http-rust-wasip3-unstable"
+description = "WASIp3 HTTP request handler using Rust (0.3.0-rc-2025-09-16)"
+tags = ["http", "rust"]
+
+[add_component]
+skip_files = ["spin.toml"]
+[add_component.snippets]
+component = "component.txt"
+
+[parameters]
+project-description = { type = "string",  prompt = "Description", default = "" }
+http-path = { type = "string", prompt = "HTTP path", default = "/...", pattern = "^/\\S*$" }