Hi I wanna one question, in you directory suppose robot.txt file is present. when search engine crawler crawl this file, I mean which file will be crawl by crawler first, is it index.html or robot.txt.
not sure about that, since its kinda part of their algorithm. And how exactly they perform the crawling only google knows.
I think robots.txt are now getting crawled but it is one of the first file bots looking to see which pages are restricted or not set to be crawled.