diff --git a/DrissionPage/chromium_base.py b/DrissionPage/chromium_base.py
index a86d5a1..3ecb753 100644
--- a/DrissionPage/chromium_base.py
+++ b/DrissionPage/chromium_base.py
@@ -1140,7 +1140,8 @@ class NetworkListener(object):
     def _loading_finished(self, **kwargs):
         """请求完成时处理方法"""
         request_id = kwargs['requestId']
-        if request_id in self._requests:
+        request = self._requests.get(request_id)
+        if request:
             try:
                 r = self._page.run_cdp('Network.getResponseBody', requestId=request_id)
                 body = r['body']
@@ -1149,7 +1150,6 @@ class NetworkListener(object):
                 body = ''
                 is_base64 = False
 
-            request = self._requests[request_id]
             target = request['target']
             rd = ResponseData(request_id, request['response'], body, self._page.tab_id, target)
             rd.method = request['method']
diff --git a/DrissionPage/session_page.py b/DrissionPage/session_page.py
index 08a12bf..e237707 100644
--- a/DrissionPage/session_page.py
+++ b/DrissionPage/session_page.py
@@ -8,7 +8,7 @@ from time import sleep
 from urllib.parse import urlparse
 
 from DownloadKit import DownloadKit
-from requests import Session, Response
+from requests import Session
 from requests.structures import CaseInsensitiveDict
 from tldextract import extract
 
@@ -507,15 +507,17 @@ class FileExists(object):
         self._setter.DownloadKit._file_exists = 'overwrite'
 
 
-def check_headers(kwargs, headers, arg) -> bool:
+def check_headers(kwargs, headers, arg):
     """检查kwargs或headers中是否有arg所示属性"""
     return arg in kwargs['headers'] or arg in headers
 
 
-def set_charset(response) -> Response:
+def set_charset(response):
     """设置Response对象的编码"""
     # 在headers中获取编码
     content_type = response.headers.get('content-type', '').lower()
+    if not content_type.endswith(';'):
+        content_type += ';'
     charset = search(r'charset[=: ]*(.*)?;', content_type)
 
     if charset: