Hello!

Having a way to pass paramters via URL seems like a very important thing to have and I think a on() handler that uses startsWith should therefore be added.
As this was essential in one of my projects, I did the changes to my local copy of the esp8266webserver library but I really strongly suggest adding this feature to allow for more interactive websites and easier programming of things like: http://esp8266.local/configure/mdns_name/this_is_my_new_name and similar use cases like passing strings via the url.

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