feat: allow custom base urls

[AbdelrahmanElawady]

Added the option to specify a custom base URL instead of the default one.

[melroy89]

Are you running your own speedtest.net server at home or?

[r3inbowari]

This is a bit hard to understand, how to run the base server at home

[melroy89]

This is a bit hard to understand, how to run the base server at home

Yes so that is why I do not understand this pr.

[AbdelrahmanElawady]

You could run a server that implements speedtest APIs. This PR can be used if speedtest requests are behind a proxy or for local testing as well. I needed these changes for something I was working on and thought it might be useful for upstream, if this is not the case, feel free to close the PR.

[melroy89]

You could run a server that implements speedtest APIs. This PR can be used if speedtest requests are behind a proxy or for local testing as well. I needed these changes for something I was working on and thought it might be useful for upstream, if this is not the case, feel free to close the PR.

Do you maybe have an example of a project that is using the speedtest api?