电脑版微信，公司要求必须使用squid代理服务器连接才能使用，目前遇到的问题是发送消息正常，但无法发送图片、文件。除微信外，其他应用访问都正常。请问如何配置squid代理服务器才能使微信正常发送图片和文件，谢谢。附部分配置。

acl SSL_ports port 443

acl Safe_ports port 443 # https

acl Safe_ports port 80          # http

acl Safe_ports port 21          # ftp

acl Safe_ports port 70          # gopher

acl Safe_ports port 210         # wais

acl Safe_ports port 1025-65535  # unregistered ports

acl Safe_ports port 280         # http-mgmt

acl Safe_ports port 488         # gss-http

acl Safe_ports port 591         # filemaker

acl Safe_ports port 777         # multiling http

acl CONNECT method CONNECT

#

# Recommended minimum Access Permission configuration:

#

# Only allow cachemgr access from localhost

http_access allow manager localhost

http_access deny manager

# Deny requests to certain unsafe ports

http_access deny !Safe_ports

# Deny CONNECT to other than secure SSL ports

#http_access allow CONNECT !SSL_ports