[enh] basic support for http proxy (see #236)

searx/poolrequests.py

@@ -66,8 +66,10 @@ class SessionSinglePool(requests.Session):
 
 
 def request(method, url, **kwargs):
-    """same as requests/requests/api.py request(...) except it use SessionSinglePool"""
+    """same as requests/requests/api.py request(...) except it use SessionSinglePool and force proxies"""
+    global settings
     session = SessionSinglePool()
+    kwargs['proxies'] = settings.get('outgoing_proxies', None)
     response = session.request(method=method, url=url, **kwargs)
     session.close()
     return response

searx/settings.yml

@@ -10,6 +10,13 @@ server:
     image_proxy : False # Proxying image results through searx
     default_locale : "" # Default interface locale - leave blank to detect from browser information or use codes from the 'locales' config section
 
+# uncomment below section if you want to use a proxy
+# see http://docs.python-requests.org/en/latest/user/advanced/#proxies
+# SOCKS proxies are not supported : see https://github.com/kennethreitz/requests/pull/478
+#outgoing_proxies :
+#    http : http://127.0.0.1:8080
+#    https: http://127.0.0.1:8080
+
 # uncomment below section only if you have more than one network interface
 # which can be the source of outgoing search requests
 #source_ips:

searx/webapp.py

@@ -110,6 +110,7 @@ _category_names = (gettext('files'),
                    gettext('news'),
                    gettext('map'))
 
+outgoing_proxies = settings.get('outgoing_proxies', None)
 
 @babel.localeselector
 def get_locale():
@@ -638,7 +639,8 @@ def image_proxy():
     resp = requests.get(url,
                         stream=True,
                         timeout=settings['server'].get('request_timeout', 2),
-                        headers=headers)
+                        headers=headers,
+                        proxies=outgoing_proxies)
 
     if resp.status_code == 304:
         return '', resp.status_code