There are very few headers that we call search engine friendly.

1) 2oo OK: This is the primary headers that needs to be for all working sites. Search engines will understand 200 ok to be ideal for crawling and indexing a site.

2. ) 301 Permanent redirect: This is again a search engine friendly header return, 301 redirect is used where you want to permanently move a particular page to an other page or an other URL. This is search engine friendly since your redirect won't affect any search engine crawlers since they will understand that your page has moved to a new location.

3. 503 status code: 503 is best to prevent search engine crawlers from crawling your website If your site is hacked or attached by a virus best is to prevent the search engines from crawling , Google's webmaster central blog has some useful information on that here.

Search Engine Genie

Labels: Search Engine Optimization, search engines