Make sure proxies have their scheme attached.

requests/adapters.py

@@ -14,7 +14,8 @@
 from .packages.urllib3.poolmanager import PoolManager, proxy_from_url
 from .hooks import dispatch_hook
 from .compat import urlparse, basestring, urldefrag
-from .utils import DEFAULT_CA_BUNDLE_PATH, get_encoding_from_headers
+from .utils import (DEFAULT_CA_BUNDLE_PATH, get_encoding_from_headers,
+ prepend_scheme_if_needed)
 from .structures import CaseInsensitiveDict
 from .packages.urllib3.exceptions import MaxRetryError
 from .packages.urllib3.exceptions import TimeoutError
@@ -116,6 +117,8 @@ def get_connection(self, url, proxies=None):
  proxy = proxies.get(urlparse(url).scheme)
 
  if proxy:
+ proxy = prepend_scheme_if_needed(proxy, urlparse(url).scheme)
+ print proxy
  conn = proxy_from_url(proxy)
  else:
  conn = self.poolmanager.connection_from_url(url)

requests/utils.py

@@ -21,7 +21,7 @@
 from . import __version__
 from . import certs
 from .compat import parse_http_list as _parse_list_header
-from .compat import quote, urlparse, bytes, str, OrderedDict
+from .compat import quote, urlparse, bytes, str, OrderedDict, urlunparse
 from .cookies import RequestsCookieJar, cookiejar_from_dict
 
 _hush_pyflakes = (RequestsCookieJar,)
@@ -561,3 +561,17 @@ def guess_json_utf(data):
  return 'utf-32-le'
  # Did not detect a valid UTF-32 ascii-range character
  return None
+
+
+def prepend_scheme_if_needed(url, new_scheme):
+ '''Given a URL that may or may not have a scheme, prepend the given scheme.
+ Does not replace a present scheme with the one provided as an argument.'''
+ scheme, netloc, path, params, query, fragment = urlparse(url, new_scheme)
+
+ # urlparse is a finicky beast, and sometimes decides that there isn't a
+ # netloc present. Assume that it's being over-cautious, and switch netloc
+ # and path if urlparse decided there was no netloc.
+ if not netloc:
+ netloc, path = path, netloc
+
+ return urlunparse((scheme, netloc, path, params, query, fragment))