diff --git a/common/buf/buffer.go b/common/buf/buffer.go
index 0f35263..9c57b71 100644
--- a/common/buf/buffer.go
+++ b/common/buf/buffer.go
@@ -168,16 +168,13 @@ func (b *Buffer) WriteByte(d byte) error {
 	return nil
 }
 
-func (b *Buffer) ReadFrom(r io.Reader) (int64, error) {
+func (b *Buffer) ReadOnceFrom(r io.Reader) (int64, error) {
 	if b.IsFull() {
 		return 0, io.ErrShortBuffer
 	}
 	n, err := r.Read(b.FreeBytes())
-	if err != nil {
-		return 0, err
-	}
 	b.end += n
-	return int64(n), nil
+	return int64(n), err
 }
 
 func (b *Buffer) ReadPacketFrom(r net.PacketConn) (int64, net.Addr, error) {
@@ -185,55 +182,46 @@ func (b *Buffer) ReadPacketFrom(r net.PacketConn) (int64, net.Addr, error) {
 		return 0, nil, io.ErrShortBuffer
 	}
 	n, addr, err := r.ReadFrom(b.FreeBytes())
-	if err != nil {
-		return 0, nil, err
-	}
 	b.end += n
-	return int64(n), addr, nil
+	return int64(n), addr, err
 }
 
 func (b *Buffer) ReadAtLeastFrom(r io.Reader, min int) (int64, error) {
 	if min <= 0 {
-		return b.ReadFrom(r)
+		return b.ReadOnceFrom(r)
 	}
 	if b.IsFull() {
 		return 0, io.ErrShortBuffer
 	}
 	n, err := io.ReadAtLeast(r, b.FreeBytes(), min)
-	if err != nil {
-		return 0, err
-	}
 	b.end += n
-	return int64(n), nil
+	return int64(n), err
 }
 
 func (b *Buffer) ReadFullFrom(r io.Reader, size int) (n int, err error) {
 	if b.IsFull() {
 		return 0, io.ErrShortBuffer
 	}
-	end := b.end + size
-	n, err = io.ReadFull(r, b.data[b.end:end])
-	if err != nil {
-		return
-	}
-	b.end = end
+	n, err = io.ReadFull(r, b.data[b.end:b.end+size])
+	b.end += n
 	return
 }
 
-func (b *Buffer) ReadAllFrom(reader io.Reader) (int, error) {
+func (b *Buffer) ReadFrom(reader io.Reader) (n int64, err error) {
 	for {
 		if b.IsFull() {
 			return 0, io.ErrShortBuffer
 		}
-		readN, err := reader.Read(b.FreeBytes())
+		var readN int
+		readN, err = reader.Read(b.FreeBytes())
+		b.end += readN
+		n += int64(readN)
 		if err != nil {
 			if errors.Is(err, io.EOF) {
-				return b.Len(), nil
-			} else {
-				return 0, err
+				err = nil
 			}
+			return
 		}
-		b.end += readN
 	}
 }
 
diff --git a/common/bufio/cache.go b/common/bufio/cache.go
index 6cb057b..99f0f2d 100644
--- a/common/bufio/cache.go
+++ b/common/bufio/cache.go
@@ -154,7 +154,7 @@ func NewCachedPacketConn(conn N.PacketConn, buffer *buf.Buffer, destination M.So
 
 func (c *CachedPacketConn) ReadPacket(buffer *buf.Buffer) (destination M.Socksaddr, err error) {
 	if c.buffer != nil {
-		_, err = buffer.ReadFrom(c.buffer)
+		_, err = buffer.ReadOnceFrom(c.buffer)
 		if err != nil {
 			return M.Socksaddr{}, err
 		}
diff --git a/common/udpnat/service.go b/common/udpnat/service.go
index b7ff39b..d3b9248 100644
--- a/common/udpnat/service.go
+++ b/common/udpnat/service.go
@@ -144,7 +144,7 @@ func (c *conn) ReadPacket(buffer *buf.Buffer) (addr M.Socksaddr, err error) {
 	}
 	select {
 	case p := <-c.data:
-		_, err = buffer.ReadFrom(p.data)
+		_, err = buffer.ReadOnceFrom(p.data)
 		p.data.Release()
 		return p.destination, err
 	case <-c.ctx.Done():
diff --git a/protocol/http/client.go b/protocol/http/client.go
index 1336215..cbca5d0 100644
--- a/protocol/http/client.go
+++ b/protocol/http/client.go
@@ -72,7 +72,7 @@ func (c *Client) DialContext(ctx context.Context, network string, destination M.
 	case http.StatusOK:
 		if reader.Buffered() > 0 {
 			buffer := buf.NewSize(reader.Buffered())
-			_, err = buffer.ReadFrom(reader)
+			_, err = buffer.ReadFullFrom(reader, buffer.FreeLen())
 			if err != nil {
 				return nil, err
 			}