diff --git a/src/api/helpers.rs b/src/api/helpers.rs
index ba7b1599..5f488912 100644
--- a/src/api/helpers.rs
+++ b/src/api/helpers.rs
@@ -1,7 +1,12 @@
 use std::convert::Infallible;
 
+use futures::{Stream, StreamExt, TryStreamExt};
+
 use http_body_util::{BodyExt, Full as FullBody};
-use hyper::{body::Body, Request, Response};
+use hyper::{
+	body::{Body, Bytes},
+	Request, Response,
+};
 use idna::domain_to_unicode;
 use serde::{Deserialize, Serialize};
 
@@ -187,6 +192,22 @@ where
 		.unwrap())
 }
 
+pub fn body_stream<B, E>(body: B) -> impl Stream<Item = Result<Bytes, E>>
+where
+	B: Body<Data = Bytes>,
+	<B as Body>::Error: Into<E>,
+	E: From<Error>,
+{
+	let stream = http_body_util::BodyStream::new(body);
+	let stream = TryStreamExt::map_err(stream, Into::into);
+	stream.map(|x| {
+		x.and_then(|f| {
+			f.into_data()
+				.map_err(|_| E::from(Error::bad_request("non-data frame")))
+		})
+	})
+}
+
 pub fn is_default<T: Default + PartialEq>(v: &T) -> bool {
 	*v == T::default()
 }
diff --git a/src/api/s3/multipart.rs b/src/api/s3/multipart.rs
index 4aa27eaf..b9d15b21 100644
--- a/src/api/s3/multipart.rs
+++ b/src/api/s3/multipart.rs
@@ -1,8 +1,7 @@
 use std::collections::HashMap;
 use std::sync::Arc;
 
-use futures::{prelude::*, TryStreamExt};
-use http_body_util::BodyStream;
+use futures::prelude::*;
 use hyper::{Request, Response};
 use md5::{Digest as Md5Digest, Md5};
 
@@ -89,10 +88,8 @@ pub async fn handle_put_part(
 	// Read first chuck, and at the same time try to get object to see if it exists
 	let key = key.to_string();
 
-	let body_stream = BodyStream::new(req.into_body())
-		.map(|x| x.map(|f| f.into_data().unwrap())) //TODO remove unwrap
-		.map_err(Error::from);
-	let mut chunker = StreamChunker::new(body_stream, garage.config.block_size);
+	let stream = body_stream(req.into_body());
+	let mut chunker = StreamChunker::new(stream, garage.config.block_size);
 
 	let ((_, _, mut mpu), first_block) = futures::try_join!(
 		get_upload(&garage, &bucket_id, &key, &upload_id),
diff --git a/src/api/s3/post_object.rs b/src/api/s3/post_object.rs
index e9732dc4..bca8d6c6 100644
--- a/src/api/s3/post_object.rs
+++ b/src/api/s3/post_object.rs
@@ -7,8 +7,7 @@ use std::task::{Context, Poll};
 use base64::prelude::*;
 use bytes::Bytes;
 use chrono::{DateTime, Duration, Utc};
-use futures::{Stream, StreamExt, TryStreamExt};
-use http_body_util::BodyStream;
+use futures::{Stream, StreamExt};
 use hyper::header::{self, HeaderMap, HeaderName, HeaderValue};
 use hyper::{body::Incoming as IncomingBody, Request, Response, StatusCode};
 use multer::{Constraints, Multipart, SizeLimit};
@@ -45,10 +44,8 @@ pub async fn handle_post_object(
 	);
 
 	let (head, body) = req.into_parts();
-	let body_stream = BodyStream::new(body)
-		.map(|x| x.map(|f| f.into_data().unwrap())) //TODO remove unwrap
-		.map_err(Error::from);
-	let mut multipart = Multipart::with_constraints(body_stream, boundary, constraints);
+	let stream = body_stream::<_, Error>(body);
+	let mut multipart = Multipart::with_constraints(stream, boundary, constraints);
 
 	let mut params = HeaderMap::new();
 	let field = loop {
diff --git a/src/api/s3/put.rs b/src/api/s3/put.rs
index 3d43eee8..17424862 100644
--- a/src/api/s3/put.rs
+++ b/src/api/s3/put.rs
@@ -4,13 +4,13 @@ use std::sync::Arc;
 use base64::prelude::*;
 use futures::prelude::*;
 use futures::try_join;
-use http_body_util::BodyStream;
-use hyper::body::Bytes;
-use hyper::header::{HeaderMap, HeaderValue};
-use hyper::{Request, Response};
 use md5::{digest::generic_array::*, Digest as Md5Digest, Md5};
 use sha2::Sha256;
 
+use hyper::body::{Body, Bytes};
+use hyper::header::{HeaderMap, HeaderValue};
+use hyper::{Request, Response};
+
 use opentelemetry::{
 	trace::{FutureExt as OtelFutureExt, TraceContextExt, Tracer},
 	Context,
@@ -51,14 +51,12 @@ pub async fn handle_put(
 		None => None,
 	};
 
-	let body_stream = BodyStream::new(req.into_body())
-		.map(|x| x.map(|f| f.into_data().unwrap())) //TODO remove unwrap
-		.map_err(Error::from);
+	let stream = body_stream(req.into_body());
 
 	save_stream(
 		garage,
 		headers,
-		body_stream,
+		stream,
 		bucket,
 		key,
 		content_md5,
diff --git a/src/api/signature/streaming.rs b/src/api/signature/streaming.rs
index ea5a64e2..39147ca0 100644
--- a/src/api/signature/streaming.rs
+++ b/src/api/signature/streaming.rs
@@ -5,7 +5,7 @@ use futures::prelude::*;
 use futures::task;
 use garage_model::key_table::Key;
 use hmac::Mac;
-use http_body_util::{BodyStream, StreamBody};
+use http_body_util::StreamBody;
 use hyper::body::{Bytes, Incoming as IncomingBody};
 use hyper::Request;
 
@@ -51,11 +51,9 @@ pub fn parse_streaming_body(
 				.ok_or_internal_error("Unable to build signing HMAC")?;
 
 			Ok(req.map(move |body| {
-				let body_stream = BodyStream::new(body)
-					.map(|x| x.map(|f| f.into_data().unwrap())) //TODO remove unwrap
-					.map_err(Error::from);
+				let stream = body_stream::<_, Error>(body);
 				let signed_payload_stream =
-					SignedPayloadStream::new(body_stream, signing_hmac, date, &scope, signature)
+					SignedPayloadStream::new(stream, signing_hmac, date, &scope, signature)
 						.map(|x| x.map(hyper::body::Frame::data))
 						.map_err(Error::from);
 				ReqBody::new(StreamBody::new(signed_payload_stream))