refactor core modules, integrate network stats

misc.py

@@ -28,6 +28,12 @@ FAIL_CLOSED = 'closed'
 FAIL_PROXY = 'proxy'
 FAIL_OTHER = 'other'
 
+# SSL errors - proxy is actively intercepting (still working for MITM proxies)
+SSL_ERRORS = frozenset({FAIL_SSL})
+
+# Connection errors - proxy might be dead, need secondary verification
+CONN_ERRORS = frozenset({FAIL_TIMEOUT, FAIL_REFUSED, FAIL_UNREACHABLE, FAIL_CLOSED, FAIL_DNS})
+
 # Levels that go to stderr
 STDERR_LEVELS = ('warn', 'error')