From 386382b18caab6a3a8a111fa8e24875dca27b0aa Mon Sep 17 00:00:00 2001
From: Jesse Shapiro <jesse@jesseshapiro.net>
Date: Wed, 4 May 2016 20:09:07 -0400
Subject: [PATCH] Encoding JSON requests to bytes for urllib3 to handle;
 ensuring same with testing.

---
 AUTHORS.rst            |  1 +
 requests/models.py     |  7 +++++--
 tests/test_requests.py | 12 ++++++++++++
 3 files changed, 18 insertions(+), 2 deletions(-)

diff --git a/AUTHORS.rst b/AUTHORS.rst
index e684d850..37b66698 100644
--- a/AUTHORS.rst
+++ b/AUTHORS.rst
@@ -165,3 +165,4 @@ Patches and Suggestions
 - Brian Samek (`@bsamek <https://github.com/bsamek>`_)
 - Dmitry Dygalo (`@Stranger6667 <https://github.com/Stranger6667>`_)
 - piotrjurkiewicz
+- Jesse Shapiro <jesse@jesseshapiro.net> (`@haikuginger <https://github.com/haikuginger>`_)
diff --git a/requests/models.py b/requests/models.py
index fe4bec1b..05ec3e47 100644
--- a/requests/models.py
+++ b/requests/models.py
@@ -420,8 +420,11 @@ class PreparedRequest(RequestEncodingMixin, RequestHooksMixin):
         length = None
 
         if not data and json is not None:
-            content_type = 'application/json'
-            body = complexjson.dumps(json)
+            # When urllib3 uses pyOpenSSL, it can only resume large uploads
+            # properly if receiving a bytes-like object. In Python 2, json.dumps()
+            # returns just that, but Python 3 returns a Unicode string.
+            content_type = 'application/json; charset=utf-8'
+            body = complexjson.dumps(json).encode('utf-8')
 
         is_stream = all([
             hasattr(data, '__iter__'),
diff --git a/tests/test_requests.py b/tests/test_requests.py
index 0a87b52c..427675d5 100755
--- a/tests/test_requests.py
+++ b/tests/test_requests.py
@@ -1516,6 +1516,18 @@ class RedirectSession(SessionRedirectMixin):
         return string
 
 
+def test_json_encodes_as_bytes():
+    # urllib3 expects bodies as bytes-like objects
+    body = {"key": "value"}
+    p = PreparedRequest()
+    p.prepare(
+        method='GET',
+        url='https://www.example.com/',
+        json='body'
+    )
+    assert isinstance(p.body, bytes)
+
+
 def test_requests_are_updated_each_time(httpbin):
     session = RedirectSession([303, 307])
     prep = requests.Request('POST', httpbin('post')).prepare()