fix(lib): remove logs that contain request and response data

Closes #1281

src/http/io.rs

@@ -6,7 +6,7 @@ use std::ptr;
 use futures::{Async, Poll};
 use tokio_io::{AsyncRead, AsyncWrite};
 
-use http::{Http1Transaction, MessageHead, DebugTruncate};
+use http::{Http1Transaction, MessageHead};
 use bytes::{BytesMut, Bytes};
 
 const INIT_BUFFER_SIZE: usize = 8192;
@@ -224,8 +224,9 @@ impl<T: AsRef<[u8]>> Cursor<T> {
 
 impl<T: AsRef<[u8]>> fmt::Debug for Cursor<T> {
     fn fmt(&self, f: &mut fmt::Formatter) -> fmt::Result {
-        f.debug_tuple("Cursor")
-            .field(&DebugTruncate(self.buf()))
+        f.debug_struct("Cursor")
+            .field("pos", &self.pos)
+            .field("len", &self.bytes.as_ref().len())
             .finish()
     }
 }