Local Testing with Network Restrictions

If proxy is auto-detected

If your internet access is mediated by a proxy server, you can configure the BrowserStack Local application to connect to our servers via your proxy. Follow these steps to get this up and running:

Navigate to http://localhost:45454, and enter your key

In case the network configuration does not require a proxy or is auto-detected you should already be up and running.

If proxy is not auto-detected

If a proxy is a strict requirement and the app is unable to auto-detect settings, you can simply configure your proxy in our dashboard on the next screen. Follow the arrow as it points you to the proxy details section.

Depending on your network settings, the proxy can work with just a host and a port, or it might need a username and a password as well.

If you are using an MITM proxy

We classify proxies into two types – transparent and MITM proxies (depending on whether or not they inspect the packets passing through them).

If your BrowserStack Local connection doesn’t work even after all this setup has been done correctly, you might be using a MITM proxy – which you can indicate to the application using a simple toggle.

If you are using a PAC file

If you have a PAC file (Proxy auto-configuration file) to configure your settings without any authentication information, you can enter the location of the file in the PAC File option in the app dashboard.

If you have correctly set up Local Testing but are still unable to load your app’s assets on remote mobile devices, then you are probably behind a proxy.

With Local Testing, you can test apps that retrieve data/content from servers that are behind proxies. Refer to this article to find proxy settings on your computer or contact your network/IT team.

Currently, we only support Local Testing through the following proxies implementations: network proxy (with no authentication or Basic HTTP auth), MITM proxy (with no authentication or Basic HTTP auth) and PAC (Proxy Auto-Configuration) with no authentication.

Proxy

Proxies are commonly set up for office networks, remote servers, and/or your local machine. Contact your network/IT team to obtain the Proxy Host and Proxy Port to setup Local Testing for this implementation.

Once you obtain the Proxy Host and Port, follow the steps below to establish a Local Testing connection:

Download BrowserStack Local binary (Windows | macOS / OS X | Linux 32-bit | Linux 64-bit)

Unzip the file to a folder/directory on your machine. Open command-line interface and navigate to the folder containing the Local binary. You can now establish a Local Testing connection using --proxy-host and --proxy-port flags.

BrowserStackLocal --key YOUR_ACCESS_KEY \
  --proxy-host <proxy_host> --proxy-port <proxy_port>

If your proxy requires authentication, add --proxy-user and --proxy-pass to the above command.

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

MITM Proxy

If your proxy type is MITM (like BrowserMob), you will need the Proxy Host and Proxy Port. Once you have the Host and Port, establish a Local Testing connection by running the following command through command-line interface:

Run the binary using the following command:

BrowserStackLocal --key YOUR_ACCESS_KEY \
  --local-proxy-host <proxy_host> --local-proxy-port <proxy_port>

If your local proxy requires authentication, add --local-proxy-user and --local-proxy-pass to the above command.

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

PAC (Proxy Auto-Configuration)

PAC file (Proxy Auto-Configuration file) is 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, establish a Local Testing connection using --pac-file flag, along with the PAC file’s absolute path.

Run the binary using the following command:

BrowserStackLocal --key YOUR_ACCESS_KEY --pac-file <pac_file_abs_path>

To resolve all requests on our remote browsers and mobile devices through your local 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.