重试逻辑fix

Author: libertyzhu

qcloud_cos/cos_client.py

@@ -374,8 +374,19 @@ def send_request(self, method, url, bucket, timeout=30, cos_request=True, ci_req
                 elif method == 'HEAD':
                     res = self._session.head(url, timeout=timeout, proxies=self._conf._proxies, **kwargs)
                 if res.status_code < 400:  # 2xx和3xx都认为是成功的
+                    if res.status_code == 301 or res.status_code == 302 or res.status_code == 307:
+                        if j < self._retry and res.headers['x-cos-request-id'] == '' \
+                            and not domain_switched and self._conf._auto_switch_domain_on_retry and self._conf._ip is None:
+                            url = switch_hostname_for_url(url)
+                            domain_switched = True
+                            continue
                     return res
                 elif res.status_code < 500:  # 4xx 不重试
+                    if j < self._retry and res.headers['x-cos-request-id'] == '' \
+                        and not domain_switched and self._conf._auto_switch_domain_on_retry and self._conf._ip is None:
+                        url = switch_hostname_for_url(url)
+                        domain_switched = True
+                        continue
                     break
                 else:
                     if j < self._retry and client_can_retry(file_position, **kwargs):