Added first support for persistent connection in NET http client implementation.

Various improvement related to eventual errors.

library/network/http_client/tests/test_net_http_client.e

@@ -37,6 +37,50 @@ feature -- Tests
 			test_headers
 		end
 
+	test_persistent_connection
+		local
+			sess: like new_session
+			h: STRING_8
+		do
+			sess := new_session ("http://www.google.fr")
+			if attached sess.get ("/", Void) as res then
+				assert ("Get returned without error", not res.error_occurred)
+				create h.make_empty
+				if attached res.headers as hds then
+					across
+						hds as c
+					loop
+						h.append (c.item.name + ": " + c.item.value + "%R%N")
+					end
+				end
+				if attached res.body as l_body then
+					assert ("body not empty", not l_body.is_empty)
+				else
+					assert ("missing body", False)
+				end
+				assert ("same headers", h.same_string (res.raw_header))
+			end
+			if attached sess.get ("/", Void) as res then
+				assert ("Get returned without error", not res.error_occurred)
+				create h.make_empty
+				if attached res.headers as hds then
+					across
+						hds as c
+					loop
+						h.append (c.item.name + ": " + c.item.value + "%R%N")
+					end
+				end
+				if attached res.body as l_body then
+					assert ("body not empty", not l_body.is_empty)
+				else
+					assert ("missing body", False)
+				end
+				assert ("same headers", h.same_string (res.raw_header))
+			end
+			sess.close
+		end
+
+
 end