Work with PAC files for Flutter tests

Use a Proxy Auto-Configuration file to route Local Testing traffic for your Flutter integration tests on BrowserStack App Automate.

A PAC file lets you define rules that decide which requests go through a proxy and which connect directly. When your network relies on a PAC file, point the Local binary to it so that your Flutter tests resolve traffic the same way your machine does.

PAC file (Proxy auto-configuration file) contains a Javascript function that determines whether a request should be sent via the proxy server. Once you have the absolute path of the PAC file on your machine, you can use it to establish a Local Testing connection.

PAC (Proxy Auto-Configuration)

Establish the Local Testing connection using the --pac-file flag, along with the PAC file’s absolute path. Run the binary using the following command:

To resolve all requests on our remote devices through your PAC proxy, add --force-proxy and --force-local flags to the command. Without these flags, Local binary tries to connect directly for enhanced performance.

Sample PAC file

The following function checks to see whether the hostname is localhost, and if so, whether the connection is direct. If the hostname is not localhost, the connection is via proxy.

function FindProxyForURL(url, host) {
  if (isPlainHostName(host))
    return "DIRECT";
  else
    return "PROXY proxy:80";
}

If you do not understand the proxy script or are not authorized to make any changes to it, contact your IT/Network team.

Run your build through the connection

After the connection is established, set the local parameter to true in your build REST API request: