feat(http): allow specifying custom body streams

src/http/chunk.rs

@@ -1,5 +1,4 @@
 use std::fmt;
-use std::sync::Arc;
 
 use http::buf::MemSlice;
 
@@ -8,7 +7,6 @@ pub struct Chunk(Inner);
 
 enum Inner {
     Owned(Vec<u8>),
-    Referenced(Arc<Vec<u8>>),
     Mem(MemSlice),
     Static(&'static [u8]),
 }
@@ -20,13 +18,6 @@ impl From<Vec<u8>> for Chunk {
     }
 }
 
-impl From<Arc<Vec<u8>>> for Chunk {
-    #[inline]
-    fn from(v: Arc<Vec<u8>>) -> Chunk {
-        Chunk(Inner::Referenced(v))
-    }
-}
-
 impl From<&'static [u8]> for Chunk {
     #[inline]
     fn from(slice: &'static [u8]) -> Chunk {
@@ -68,7 +59,6 @@ impl AsRef<[u8]> for Chunk {
     fn as_ref(&self) -> &[u8] {
         match self.0 {
             Inner::Owned(ref vec) => vec,
-            Inner::Referenced(ref vec) => vec,
             Inner::Mem(ref slice) => slice.as_ref(),
             Inner::Static(slice) => slice,
         }