From ec700a9a1338975cbd340001091aa2c6d98c8988 Mon Sep 17 00:00:00 2001
From: "Rasmus Scholer (TimelineX)" <rasmusscholer@gmail.com>
Date: Wed, 4 Mar 2015 10:21:38 -0500
Subject: [PATCH] Avoid duplicating files data when creating a Request with
 str/bytes/bytearray in the files argument. 30-40% performance improvement.

---
 requests/models.py | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/requests/models.py b/requests/models.py
index 4b2648f6..317d0ee4 100644
--- a/requests/models.py
+++ b/requests/models.py
@@ -143,12 +143,13 @@ class RequestEncodingMixin(object):
             else:
                 fn = guess_filename(v) or k
                 fp = v
-            if isinstance(fp, str):
-                fp = StringIO(fp)
-            if isinstance(fp, (bytes, bytearray)):
-                fp = BytesIO(fp)
 
-            rf = RequestField(name=k, data=fp.read(),
+            if isinstance(fp, (str, bytes, bytearray)):
+                fdata = fp
+            else:
+                fdata = fp.read()
+
+            rf = RequestField(name=k, data=fdata,
                               filename=fn, headers=fh)
             rf.make_multipart(content_type=ft)
             new_fields.append(rf)