do search engines crawl the source or destination page when using 301,302 redirect?

Question

What search do when they found different status code?

• 302
• 301
• 404
• etc...

I knew they would ignore the pages with 404 status code but what about the other statuses

do search engines crawl the source or destination page?

Answer 1

From "301 Redirects and Search Engine Optimization" :

From a search engine perspective, 301 redirects are the only acceptable way to redirect URLs. In the case of moved pages, search engines will index only the new URL, but will transfer link popularity from the old URL to the new one so that search engine rankings are not affected. The same behavior occurs when additional domains are set to point to the main domain through a 301 redirect.

Edit:
Take a look at these pages describing the difference between 301 and 302 redirects, and why 302's should usually be avoided: Here , Here and Here .