Do not lowercase hostnames with custom-protocol(#1267)

Unix sockets are are case sensitive the same as other files
on standard unix file systems.

1 files changed, 7 insertions, 4 deletions

diff --git a/urllib3/connectionpool.py b/urllib3/connectionpool.py
index 0b38963a..8fcb0bce 100644
--- a/urllib3/connectionpool.py
+++ b/urllib3/connectionpool.py
@@ -40,9 +40,10 @@ from .util.request import set_file_position
 from .util.response import assert_header_parsing
 from .util.retry import Retry
 from .util.timeout import Timeout
-from .util.url import get_host, Url
+from .util.url import get_host, Url, NORMALIZABLE_SCHEMES
 from .util.queue import LifoQueue
 
+
 xrange = six.moves.xrange
 
 log = logging.getLogger(__name__)
@@ -64,7 +65,7 @@ class ConnectionPool(object):
         if not host:
             raise LocationValueError("No host specified.")
 
-        self.host = _ipv6_host(host).lower()
+        self.host = _ipv6_host(host, self.scheme)
         self._proxy_host = host.lower()
         self.port = port
 
@@ -432,7 +433,7 @@ class HTTPConnectionPool(ConnectionPool, RequestMethods):
         # TODO: Add optional support for socket.gethostbyname checking.
         scheme, host, port = get_host(url)
 
-        host = _ipv6_host(host).lower()
+        host = _ipv6_host(host, self.scheme)
 
         # Use explicit default port for comparison when none is given
         if self.port and not port:
@@ -884,7 +885,7 @@ def connection_from_url(url, **kw):
         return HTTPConnectionPool(host, port=port, **kw)
 
 
-def _ipv6_host(host):
+def _ipv6_host(host, scheme):
     """
     Process IPv6 address literals
     """
@@ -900,4 +901,6 @@ def _ipv6_host(host):
     # percent sign might be URIencoded, convert it back into ASCII
     if host.startswith('[') and host.endswith(']'):
         host = host.replace('%25', '%').strip('[]')
+    if scheme in NORMALIZABLE_SCHEMES:
+        host = host.lower()
     return host