Update P3 docs and error message

Cargo.toml

@@ -13,6 +13,10 @@ description = """
 The Spin Rust SDK makes it easy to build Spin components in Rust.
 """
 
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = ["--cfg", "docsrs"]
+
 [lib]
 name = "spin_sdk"
 

crates/spin-wasip3-http-macro/src/lib.rs

@@ -1,52 +1,14 @@
 use proc_macro::TokenStream;
 use quote::quote;
 
-/// Marks an `async fn` as an HTTP component entrypoint for Spin.
-///
-/// The `#[http_service]` attribute designates an asynchronous function as the
-/// handler for incoming HTTP requests in a Spin component using the WASI Preview 3
-/// (`wasip3`) HTTP ABI.  
-///
-/// When applied, this macro generates the necessary boilerplate to export the
-/// function to the Spin runtime as a valid HTTP handler. The function must be
-/// declared `async` and take a single argument implementing
-/// [`FromRequest`](::spin_sdk::http_wasip3::FromRequest), typically
-/// [`Request`](::spin_sdk::http_wasip3::Request), and must return a type that
-/// implements [`IntoResponse`](::spin_sdk::http_wasip3::IntoResponse).
-///
-/// # Requirements
-///
-/// - The annotated function **must** be `async`.
-/// - The function’s parameter type must implement [`FromRequest`].
-/// - The return type must implement [`IntoResponse`].
-///
-/// If the function is not asynchronous, the macro emits a compile-time error.
-///
-/// # Example
-///
-/// ```ignore
-/// use spin_sdk::http_wasip3::{http_service, Request, IntoResponse};
-///
-/// #[http_service]
-/// async fn my_handler(request: Request) -> impl IntoResponse {
-///   // Your logic goes here
-/// }
-/// ```
-///
-/// # Generated Code
-///
-/// The macro expands into a module containing a `Spin` struct that implements the
-/// WASI `http.handler/Guest` interface, wiring the annotated function as the
-/// handler’s entrypoint. This allows the function to be invoked automatically
-/// by the Spin runtime when HTTP requests are received.
 #[proc_macro_attribute]
 pub fn http_service(_attr: TokenStream, item: TokenStream) -> TokenStream {
     let func = syn::parse_macro_input!(item as syn::ItemFn);
 
     if func.sig.asyncness.is_none() {
         return syn::Error::new_spanned(
             func.sig.fn_token,
-            "the `#[http_component]` function must be `async`",
+            "the `#[http_service]` function must be `async`",
         )
         .to_compile_error()
         .into();

crates/spin-wasip3-http/src/lib.rs

@@ -1,4 +1,4 @@
-//! Experimental Rust SDK for WASIp3 http.
+//! Experimental Rust SDK for WASIp3 HTTP.
 
 #![deny(missing_docs)]
 
@@ -328,14 +328,14 @@ where
     }
 }
 
-/// Helpers for consuming an [`IncomingBody`].
+/// Helpers for consuming an [`wasip3::http_compat::IncomingBody`].
 ///
 /// This module provides extension traits and utilities for working with
-/// [`IncomingBody`] instances, such as streaming or collecting the entire
+/// [`wasip3::http_compat::IncomingBody`] instances, such as streaming or collecting the entire
 /// body into memory.
 ///
 /// These helpers make it easier to transform low-level streaming body types
-/// into higher-level forms (e.g., [`Bytes`]) for simplified data handling.
+/// into higher-level forms (e.g., [`bytes::Bytes`]) for simplified data handling.
 pub mod body {
     use bytes::Bytes;
     use http_body_util::{BodyDataStream, BodyExt};

src/lib.rs

@@ -1,6 +1,7 @@
 //! The Rust Spin SDK.
 
 #![deny(missing_docs)]
+#![cfg_attr(docsrs, feature(doc_cfg))]
 
 #[cfg(test)]
 mod test;
@@ -19,14 +20,56 @@ pub mod llm;
 
 pub use spin_macro::*;
 
-/// WASIp3 HTTP APIs and helpers
+/// WASIp3 HTTP APIs and helpers.
+///
+/// **The contents of this module are unstable.** Module APIs may change in future releases,
+/// and may not work with future versions of Spin (as they bind to a particular WASI RC
+/// which Spin will retire once a stable WASIp3 is available)/
 #[cfg(feature = "wasip3-unstable")]
+#[cfg_attr(docsrs, doc(cfg(feature = "wasip3-unstable")))]
 pub mod http_wasip3 {
-    /// Re-exports the helpers types for converting between WASIp3 HTTP types and
-    /// Rust ecosystem HTTP types.
     pub use spin_wasip3_http::*;
-    /// Re-exports the macro to enable WASIp3 HTTP handlers
-    pub use spin_wasip3_http_macro::*;
+
+    /// Marks an `async fn` as an HTTP component entrypoint for Spin.
+    ///
+    /// The `#[http_service]` attribute designates an asynchronous function as the
+    /// handler for incoming HTTP requests in a Spin component using the WASI Preview 3
+    /// (`wasip3`) HTTP ABI.  
+    ///
+    /// When applied, this macro generates the necessary boilerplate to export the
+    /// function to the Spin runtime as a valid HTTP handler. The function must be
+    /// declared `async` and take a single argument implementing
+    /// [`FromRequest`], typically
+    /// [`Request`], and must return a type that
+    /// implements [`IntoResponse`].
+    ///
+    /// # Requirements
+    ///
+    /// - The annotated function **must** be `async`.
+    /// - The function’s parameter type must implement [`FromRequest`].
+    /// - The return type must implement [`IntoResponse`].
+    /// - The Spin manifest must specify `executor = { type = "wasip3-unstable" }`
+    ///
+    /// If the function is not asynchronous, the macro emits a compile-time error.
+    ///
+    /// # Example
+    ///
+    /// ```ignore
+    /// use spin_sdk::http_wasip3::{http_service, Request, IntoResponse};
+    ///
+    /// #[http_service]
+    /// async fn my_handler(request: Request) -> impl IntoResponse {
+    ///   // Your logic goes here
+    /// }
+    /// ```
+    ///
+    /// # Generated Code
+    ///
+    /// The macro expands into a module containing a `Spin` struct that implements the
+    /// WASI `http.handler/Guest` interface, wiring the annotated function as the
+    /// handler’s entrypoint. This allows the function to be invoked automatically
+    /// by the Spin runtime when HTTP requests are received.
+    pub use spin_wasip3_http_macro::http_service;
 }
 
 #[doc(hidden)]