diff --git a/app/front/views.py b/app/front/views.py
index faab305..17ddc12 100644
--- a/app/front/views.py
+++ b/app/front/views.py
@@ -216,15 +216,8 @@ def show(fileid,user,action='download',token=None):
 # @front.route('/py_redirect/<user>/<fileid>')
 def redirect_file(user,fileid):
     filename=GetName(fileid)
-    ext=filename.split('.')[-1].lower()
-    _headers={}
-    _headers['User-Agent']=request.headers['User-Agent']
-    _range=request.headers.get('Range')
-    if _range is not None:
-        _headers['Range']=_range
-        min_,max_=_range.split('=')[-1].split('-')
     downloadUrl,play_url=GetDownloadUrl(fileid,user)
-    req = browser.get(play_url, stream = True ,headers=_headers)
+    req = browser.get(play_url, stream = True)
     headers = dict([(name, value) for (name, value) in req.raw.headers.items()])
     cache_root=os.path.join(GetConfig('config_dir'),'cache')
     if not os.path.exists(cache_root):
diff --git a/app/templates/theme/material/show/pdf.html b/app/templates/theme/material/show/pdf.html
index 5daad94..f5be1c2 100644
--- a/app/templates/theme/material/show/pdf.html
+++ b/app/templates/theme/material/show/pdf.html
@@ -1,6 +1,7 @@
 {%extends 'theme/'+GetConfig('theme')+'/layout.html'%}
 
 {%block content%}
+
 <div class="mdui-container-fluid">
   <br>
   <iframe src="{{url.split('?')[0]}}?action=iframe" width="100%" height="800px"></iframe>
diff --git a/app/utils/header.py b/app/utils/header.py
index 07102dd..b7a8b37 100644
--- a/app/utils/header.py
+++ b/app/utils/header.py
@@ -720,7 +720,7 @@ def CalcSpeed(length,timecost):
 
 def MakeResponse(content):
     resp=make_response(content)
-    resp.headers['Cache-Control'] = 'no-cache, no-store, must-revalidate'
+    resp.headers['Cache-Control'] = 'no-cache,max-age=0'
     resp.headers['Pragma'] = 'no-cache'
     resp.headers['Expires'] = '0'
     return resp