Add proxy support to fix #4639 (#4946)

* Add proxy support to fix #4639

* Update sample app for testing

* Fix indentation and remove leftover code

* Update sample for new rest template

modules/swagger-codegen/src/main/resources/python/configuration.mustache

@@ -80,6 +80,9 @@ class Configuration(object):
         # client key file
         self.key_file = None
 
+        # Proxy URL
+        self.proxy = None
+
     @property
     def logger_file(self):
         """

modules/swagger-codegen/src/main/resources/python/rest.mustache

@@ -76,7 +76,21 @@ class RESTClientObject(object):
         # key file
         key_file = Configuration().key_file
 
+        # proxy
+        proxy = Configuration().proxy
+
         # https pool manager
+        if proxy:
+            self.pool_manager = urllib3.ProxyManager(
+                num_pools=pools_size,
+                maxsize=maxsize,
+                cert_reqs=cert_reqs,
+                ca_certs=ca_certs,
+                cert_file=cert_file,
+                key_file=key_file,
+                proxy_url=proxy
+            )
+        else:
             self.pool_manager = urllib3.PoolManager(
                 num_pools=pools_size,
                 maxsize=maxsize,
@@ -86,6 +100,7 @@ class RESTClientObject(object):
                 key_file=key_file
             )
 
+
     def request(self, method, url, query_params=None, headers=None,
                 body=None, post_params=None, _preload_content=True, _request_timeout=None):
         """

samples/client/petstore-security-test/python/petstore_api/configuration.py

@@ -89,6 +89,9 @@ class Configuration(object):
         # client key file
         self.key_file = None
 
+        # Proxy URL
+        self.proxy = None
+
     @property
     def logger_file(self):
         """

samples/client/petstore-security-test/python/petstore_api/rest.py

@@ -85,7 +85,21 @@ class RESTClientObject(object):
         # key file
         key_file = Configuration().key_file
 
+       # proxy
+        proxy = Configuration().proxy
+
         # https pool manager
+        if proxy:
+            self.pool_manager = urllib3.ProxyManager(
+                num_pools=pools_size,
+                maxsize=maxsize,
+                cert_reqs=cert_reqs,
+                ca_certs=ca_certs,
+                cert_file=cert_file,
+                key_file=key_file,
+                proxy_url=proxy
+            )
+        else:
             self.pool_manager = urllib3.PoolManager(
                 num_pools=pools_size,
                 maxsize=maxsize,
@@ -95,6 +109,15 @@ class RESTClientObject(object):
                 key_file=key_file
             )
 
+        # https pool manager
+        self.pool_manager = urllib3.PoolManager(
+            num_pools=pools_size,
+            cert_reqs=cert_reqs,
+            ca_certs=ca_certs,
+            cert_file=cert_file,
+            key_file=key_file
+        )
+
     def request(self, method, url, query_params=None, headers=None,
                 body=None, post_params=None, _preload_content=True, _request_timeout=None):
         """

samples/client/petstore/python/petstore_api/configuration.py

@@ -89,6 +89,9 @@ class Configuration(object):
         # client key file
         self.key_file = None
 
+        # Proxy URL
+        self.proxy = None
+
     @property
     def logger_file(self):
         """

samples/client/petstore/python/petstore_api/rest.py

@@ -85,7 +85,21 @@ class RESTClientObject(object):
         # key file
         key_file = Configuration().key_file
 
+        # proxy
+        proxy = Configuration().proxy
+
         # https pool manager
+        if proxy:
+            self.pool_manager = urllib3.ProxyManager(
+                num_pools=pools_size,
+                maxsize=maxsize,
+                cert_reqs=cert_reqs,
+                ca_certs=ca_certs,
+                cert_file=cert_file,
+                key_file=key_file,
+                proxy_url=proxy
+            )
+        else:
             self.pool_manager = urllib3.PoolManager(
                 num_pools=pools_size,
                 maxsize=maxsize,
@@ -95,6 +109,7 @@ class RESTClientObject(object):
                 key_file=key_file
             )
 
+
     def request(self, method, url, query_params=None, headers=None,
                 body=None, post_params=None, _preload_content=True, _request_timeout=None):
         """