From 30d3aceb6cf28ef4624c89336ec1e7c2c85b77fa Mon Sep 17 00:00:00 2001
From: cdeler <serj.krotov@gmail.com>
Date: Tue, 4 Aug 2020 22:15:20 +0300
Subject: [PATCH] #1105 raise warning if proxy scheme is http, https, all
 instead of http://, https://, all://

---
 httpx/_client.py | 44 ++++++++++++++++++++++++++++++--------------
 1 file changed, 30 insertions(+), 14 deletions(-)

diff --git a/httpx/_client.py b/httpx/_client.py
index e4b212b4ac..8811c7415e 100644
--- a/httpx/_client.py
+++ b/httpx/_client.py
@@ -100,9 +100,20 @@ def _get_proxy_map(
             return {}
         if isinstance(proxies, dict):
             new_proxies = {}
+            filtered_proxy_keys = {"all", "http", "https"}
+            wrong_proxy_schemas = []
             for key, value in proxies.items():
+                if key in filtered_proxy_keys:
+                    wrong_proxy_schemas.append(key)
                 proxy = Proxy(url=value) if isinstance(value, (str, URL)) else value
                 new_proxies[str(key)] = proxy
+
+            if wrong_proxy_schemas:
+                valid_proxies = (f"{prefix}://" for prefix in wrong_proxy_schemas)
+                logger.warning(
+                    f"You should use proxy schemes like {', '.join(valid_proxies)} "
+                    f"instead of using {', '.join(wrong_proxy_schemas)}"
+                )
             return new_proxies
         else:
             proxy = Proxy(url=proxies) if isinstance(proxies, (str, URL)) else proxies
@@ -485,22 +496,27 @@ def __init__(
             app=app,
             trust_env=trust_env,
         )
-        self._proxies: typing.Dict[
-            URLPattern, typing.Optional[httpcore.SyncHTTPTransport]
-        ] = {
-            URLPattern(key): None
-            if proxy is None
-            else self._init_proxy_transport(
-                proxy,
-                verify=verify,
-                cert=cert,
-                http2=http2,
-                limits=limits,
-                trust_env=trust_env,
+        proxies: typing.List[
+            typing.Tuple[URLPattern, typing.Optional[httpcore.SyncHTTPTransport]]
+        ] = [
+            (
+                URLPattern(key),
+                None
+                if proxy is None
+                else self._init_proxy_transport(
+                    proxy,
+                    verify=verify,
+                    cert=cert,
+                    http2=http2,
+                    limits=limits,
+                    trust_env=trust_env,
+                ),
             )
             for key, proxy in proxy_map.items()
-        }
-        self._proxies = dict(sorted(self._proxies.items()))
+        ]
+        self._proxies: typing.Dict[
+            URLPattern, typing.Optional[httpcore.SyncHTTPTransport]
+        ] = dict(sorted(proxies))
 
     def _init_transport(
         self,