Since robots.txt files impact crawling, it’s important for site owners to understand how it’s treated by search engines. Columnist Glenn Gabe covers two cases involving multiple robots.txt files (by subdomain and protocol).
Please visit Search Engine Land for the full article.
Source: Search Engine Land
Link: Mixed Directives: A reminder that robots.txt files are handled by subdomain and protocol, including www/non-www and http/https [Case Study]