在微信公众号第三方平台要生成自定义菜单时，程序反应很慢，最终提示"获取access_token失败"（之前程序无改动，使用时间已久），查了大半天，找不出原因。
排除、在微信公众号平台的网页接口调试https://mp.weixin.qq.com/debug/cgi-bin/apiinfo?t=index&type=%E5%9F%BA%E7%A1%80%E6%94%AF%E6%8C%81&form=%E8%8E%B7%E5%8F%96access_token%E6%8E%A5%E5%8F%A3%20/token
调试返回正常，可获取到access_token,
最后才知道，平台使用的是微信的hosts配置，已固定IP指向api.weixin.qq.com
修改服务器的hosts配置为180.163.26.36 api.weixin.qq.com
修改后正常使用
备注：在网上找到一个方法查找微信api服务器的IP地址段，
https://api.weixin.qq.com/cgi-bin/getcallbackip?access_token=""
得到的IP地址段如下
| {"ip_list":["101.226.62.77","101.226.62.78","101.226.62.79","101.226.62.80","101.226.62.81","101.226.62.82","101.226.62.83","101.226.62.84","101.226.62.85","101.226.62.86","101.226.103.59","101.226.103.60","101.226.103.61","101.226.103.62","101.226.103.63","101.226.103.69","101.226.103.70","101.226.103.71","101.226.103.72","101.226.103.73","140.207.54.73","140.207.54.74","140.207.54.75","140.207.54.76","140.207.54.77","140.207.54.78","140.207.54.79","140.207.54.80","182.254.11.203","182.254.11.202","182.254.11.201","182.254.11.200","182.254.11.199","182.254.11.198","59.37.97.100","59.37.97.101","59.37.97.102","59.37.97.103","59.37.97.104","59.37.97.105","59.37.97.106","59.37.97.107","59.37.97.108","59.37.97.109","59.37.97.110","59.37.97.111","59.37.97.112","59.37.97.113","59.37.97.114","59.37.97.115","59.37.97.116","59.37.97.117","59.37.97.118","112.90.78.158","112.90.78.159","112.90.78.160","112.90.78.161","112.90.78.162","112.90.78.163","112.90.78.164","112.90.78.165","112.90.78.166","112.90.78.167","140.207.54.19","140.207.54.76","140.207.54.77","140.207.54.78","140.207.54.79","140.207.54.80","180.163.15.149","180.163.15.151","180.163.15.152","180.163.15.153","180.163.15.154","180.163.15.155","180.163.15.156","180.163.15.157","180.163.15.158","180.163.15.159","180.163.15.160","180.163.15.161","180.163.15.162","180.163.15.163","180.163.15.164","180.163.15.165","180.163.15.166","180.163.15.167","180.163.15.168","180.163.15.169","180.163.15.170","101.226.103.0/25","101.226.233.128/25","58.247.206.128/25","182.254.86.128/25","103.7.30.21","103.7.30.64/26","58.251.80.32/27","183.3.234.32/27","121.51.130.64/27"]} |