override _set_proxy_headers

This forces _set_proxy_headers in urllib3.poolmanager.ProxyManager to
not send "Accept: */*" through the proxy. A proxy like mitmproxy will
pass along this "Accept" header to the destination, which is not always
the desired result.

careful_requests/careful_requests.py

@@ -98,6 +98,15 @@ def connect(self):
 requests.packages.urllib3.connectionpool.HTTPSConnection = CarefulHTTPSConnection
 requests.packages.urllib3.connectionpool.VerifiedHTTPSConnection = CarefulVerifiedHTTPSConnection
 
+def _set_proxy_headers(self, headers=None):
+    headers = headers or {}
+
+    # headers['Accept'] = '*/*'
+    # headers['Proxy-Connection'] = 'Keep-Alive'
+
+    return headers
+requests.packages.urllib3.poolmanager.ProxyManager._set_proxy_headers = _set_proxy_headers
+
 class CarefulSession(requests.sessions.Session):
     def __init__(self, *args, **kwargs):
         config = {}

setup.py

@@ -3,7 +3,7 @@
 
 setup(
     name="careful-requests",
-    version="0.1.3",
+    version="0.1.4",
     url="https://github.com/kanzure/careful-requests",
     license="BSD",
     author="Bryan Bishop",