Update FransLinkfinder.py

[safe6Sec]

add url status check

[InitRoot]

Hi, holding off on this now as it would create additional traffic out of band for the user. The mapping function, which the user can select will automatically attempt to then remap it.

Could you maybe add some logic on to why user's might want to do the out of band requests to check if URL is valid? Have you tested this on large sites and what does the performance impact look like?