dont try to redirect if post body cannot be reset

src/body.rs

@@ -115,3 +115,10 @@ pub fn as_hyper_body<'a>(body: &'a mut Body) -> ::hyper::client::Body<'a> {
         }
     }
 }
+
+pub fn can_reset(body: &Body) -> bool {
+    match body.reader {
+        Kind::Bytes(_) => true,
+        Kind::Reader(..) => false,
+    }
+}

src/client.rs

@@ -213,7 +213,13 @@ impl<'a> RequestBuilder<'a> {
                     true
                 },
                 StatusCode::TemporaryRedirect |
-                StatusCode::PermanentRedirect => true,
+                StatusCode::PermanentRedirect => {
+                    if let Some(ref body) = body {
+                        body::can_reset(body)
+                    } else {
+                        true
+                    }
+                },
                 _ => false,
             };