Browser does not allow operation with FollowRedirects false

[fgm]

The Browser.shouldRedirect() method prevents operations when FollowRedirects is false, which is needed in some case, like debugging a form-based workflow to ascertain the data during intermediary redirect.

This is normally supported by returning ErrUseLastResponse instead of a nondescript error like that function does.

This suggests two ways to address the problem

• either just return the ErrUseLastResponse error, which is probably the most logical, but will likely break a number of uses
• support injecting either the Client.CheckRedirect or even the complete client in the Browser object, to allow use of a custom redirect handler, as well as other changes. One nice way to do this in compatible fashion would be for NewBrowser to take a variadic Options providing the ability to customize the browser.