Reduce dependency on futures-util (#3358)

axum-extra/src/extract/multipart.rs

@@ -10,7 +10,7 @@ use axum::{
 };
 use axum_core::__composite_rejection as composite_rejection;
 use axum_core::__define_rejection as define_rejection;
-use futures_util::stream::Stream;
+use futures_core::stream::Stream;
 use http::{
     header::{HeaderMap, CONTENT_TYPE},
     Request, StatusCode,

axum-extra/src/handler/mod.rs

@@ -7,7 +7,8 @@ use axum::{
     handler::Handler,
     response::{IntoResponse, Response},
 };
-use futures_util::future::{BoxFuture, FutureExt, Map};
+use futures_core::future::BoxFuture;
+use futures_util::future::{FutureExt, Map};
 use std::{future::Future, marker::PhantomData};
 
 mod or;

axum-extra/src/handler/or.rs

@@ -5,7 +5,8 @@ use axum::{
     handler::Handler,
     response::{IntoResponse, Response},
 };
-use futures_util::future::{BoxFuture, Either as EitherFuture, FutureExt, Map};
+use futures_core::future::BoxFuture;
+use futures_util::future::{Either as EitherFuture, FutureExt, Map};
 use std::{future::Future, marker::PhantomData};
 
 /// [`Handler`] that runs one [`Handler`] and if that rejects it'll fallback to another

axum-extra/src/json_lines.rs

@@ -7,7 +7,8 @@ use axum::{
     BoxError,
 };
 use bytes::{BufMut, BytesMut};
-use futures_util::stream::{BoxStream, Stream, TryStream, TryStreamExt};
+use futures_core::{stream::BoxStream, Stream, TryStream};
+use futures_util::stream::TryStreamExt;
 use pin_project_lite::pin_project;
 use serde::{de::DeserializeOwned, Serialize};
 use std::{
@@ -44,7 +45,7 @@ pin_project! {
     /// ```rust
     /// use axum::{BoxError, response::{IntoResponse, Response}};
     /// use axum_extra::json_lines::JsonLines;
-    /// use futures_util::stream::Stream;
+    /// use futures_core::stream::Stream;
     ///
     /// fn stream_of_values() -> impl Stream<Item = Result<serde_json::Value, BoxError>> {
     ///     # futures_util::stream::empty()

axum-extra/src/response/file_stream.rs

@@ -4,7 +4,7 @@ use axum::{
     BoxError,
 };
 use bytes::Bytes;
-use futures_util::TryStream;
+use futures_core::TryStream;
 use http::{header, StatusCode};
 use std::{io, path::Path};
 use tokio::{