问题
I have pages with structure like this some_page?id=123
Sometimes records are deleted, but those pages still get visited by people and search engines. One problem is that I have a php script and no MVC structure, so I have to query the DB all on the same page before I find out that the user record does not exist.
Should I return a 404 in that case? Or what is best practice?
Thanks!
回答1:
If the client (users, search engines, etc.) requests a resource that does not exist and has never existed, a 404 status ("Not Found") should be returned.
However, if a resource is requested that once existed and has since been permanently removed, a 410 status ("Gone") should be returned. A 410 status specifically states that the resource will never be available in the future, and triggers search engines to remove that page from their indexes.
A 301 status is used if a resource's location has changed permanently.
回答2:
A 404 is when something is not found and since the resource being looked up is not found, it seems entirely appropriate to me.
回答3:
That depends if you want to keep the user on your site. If you redirect permanently to another page, then make sure you also have a 301 in the headers so that search engines don't penalize you for to many links pointing to the same page.
A 404 is ok, but you will get bounces from that page if users' browsers don't render any content.
I personally think the best approach is show a friendly page for users and set headers correctly for search engines.
http://en.wikipedia.org/wiki/List_of_HTTP_status_codes
回答4:
yes. that would be proper provided you have no substitute to capitalize with. it would be better for you to server up a similarly subjected resource or even a re-direct.
回答5:
Yes - but don't forget to offer the visitor some additional related content. Just because the url isn't found doesn't mean that the visitor should be ignored. Show a custom 404 page with some other sections of the site that may pertain - possibly the most visited pages,...
来源：https://stackoverflow.com/questions/8650898/if-record-is-not-found-in-the-database-should-i-return-a-404