Re-export more body utilities (#162)

Useful when implementing `IntoResponse`

src/body.rs

@@ -1,14 +1,17 @@
 //! HTTP body utilities.
 
 use crate::Error;
-use bytes::Bytes;
 use tower::BoxError;
 
 #[doc(no_inline)]
-pub use http_body::Body as HttpBody;
+pub use http_body::{Body as HttpBody, Empty, Full};
+
 #[doc(no_inline)]
 pub use hyper::body::Body;
 
+#[doc(no_inline)]
+pub use bytes::Bytes;
+
 /// A boxed [`Body`] trait object.
 ///
 /// This is used in axum as the response body type for applications. Its

src/extract/request_parts.rs

@@ -82,7 +82,7 @@ where
 /// # Example
 ///
 /// ```
-/// use axum::{prelude::*, extract::NestedUri, http::Uri};
+/// use axum::{prelude::*, routing::nest, extract::NestedUri, http::Uri};
 ///
 /// let api_routes = route(
 ///     "/users",

src/response.rs

@@ -89,17 +89,20 @@ pub trait IntoResponse {
     /// Unless you're implementing this trait for a custom body type, these are
     /// some common types you can use:
     ///
-    /// - [`hyper::Body`]: A good default that supports most use cases.
-    /// - [`http_body::Empty<Bytes>`]: When you know your response is always
+    /// - [`hyper::Body`]: A good default that supports most use cases. This is
+    /// also re-exported as [`axum::body::Body`].
+    /// - [`axum::body::Empty<Bytes>`]: When you know your response is always
     /// empty.
-    /// - [`http_body::Full<Bytes>`]: When you know your response always
+    /// - [`axum::body::Full<Bytes>`]: When you know your response always
     /// contains exactly one chunk.
-    /// - [`BoxBody`]: If you need to unify multiple body types into one, or
-    /// return a body type that cannot be named. Can be created with
+    /// - [`axum::body::BoxBody`]: If you need to unify multiple body types into
+    /// one, or return a body type that cannot be named. Can be created with
     /// [`box_body`].
     ///
-    /// [`http_body::Empty<Bytes>`]: http_body::Empty
-    /// [`http_body::Full<Bytes>`]: http_body::Full
+    /// [`axum::body::Body`]: crate::body::Body
+    /// [`axum::body::Empty<Bytes>`]: crate::body::Empty
+    /// [`axum::body::Full<Bytes>`]: crate::body::Full
+    /// [`axum::body::BoxBody`]: crate::body::BoxBody
     type Body: http_body::Body<Data = Bytes, Error = Self::BodyError> + Send + Sync + 'static;
 
     /// The error type `Self::Body` might generate.