some Alternate of Canonical URLs

There are few methods as an alternative of canonical URLs, these methods are
effective work well. But there is a problem with these methods. Most of the
methods support non indexing…
) 301 Redirect-: in many cases the best way to combat duplicate content is
to set up a 301 redirect from duplicate page to the original page. In apache
server you can do this with an .htaccess file; in IIS you can do this through the
administrative console.

2) Robot.txt:- it is a text file you can put it on your site to tell search robots which
pages you would like them not to visit. There is a problem with this method,
that if you use it for the page, then that page is not going to be index in search
engines.

3) Meta robots : No Index it is a another way to block the duplicate content, in this
we use <meta name=”robots”content=”no index,follow”/> this method also tells
the search engine that it is a duplicate content so not to index this as well. But
we can get the link juice value from it.

4) Alternate Link Tag:- it is quite similar to the canonical tag, but mostly it is used
for multilingual sites.
<Link rel=”alternate” hreflang=”en” href=”www.xyz.com/path”/>
<Link rel=”alternate” hreflang=”en” href=”www.xyz.co.uk/path”/>
In this all pages will stay indexed in search engines