How to set a proxy for an existing Wi-Fi connection, on Android

When you are connected to a Wi-Fi network, you can change its settings, so that it uses a specific proxy server each time you connect to it.

• To do that, open the Settings app on your Android smartphone or tablet.
• Next, tap on Wi-Fi to see the wireless networks in your area.
• You are shown a list of all the Wi-Fi networks that are available in your area. Tap and hold on the name of the network that you are connected to. A menu is shown with different contextual options.
• Tap “Modify network” so that you can set the proxy server used for that Wi-Fi. You are shown a list of settings for the selected network connection.
• Tap Advanced options or check “Show advanced options” so that more settings are shown, including those related to the use of a proxy server.Scroll down a bit, and tap the Proxy option.
• Then, choose Proxy Auto-Config (in Android 8) or Auto (in Android 9), you have to enter the URL (web address) of the proxy server :
  http://siba.unipv.it/proxybib.pac
• To apply your proxy settings, do not forget to tap Save. Now Android uses the proxy server that you have set when connected to the wireless network that you are on.