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Multiple Redirects: Using multiple 301 redirects in succession (A to B, then B to C) can lead to increased page load times and may dilute SEO value. Mixed Content Issues : When redirecting from HTTP to HTTPS, ensure that all resources (images, scripts, stylesheets) on the page are also loaded over HTTPS to prevent mixed content warnings.
[14] [15] A timeout of zero seconds effects an immediate redirect. This is treated like a 301 permanent redirect by Google, allowing transfer of PageRank to the target page. [16] This is an example of a simple HTML document that uses this technique:
A .htaccess file is often used to specify security restrictions for a directory, hence the filename "access". The .htaccess file is often accompanied by a .htpasswd file which stores valid usernames and their passwords. [5] URL rewriting Servers often use .htaccess for rewriting long, overly comprehensive URLs to shorter and more memorable ones.
308 Permanent Redirect This and all future requests should be directed to the given URI. 308 parallels the behavior of 301, but does not allow the HTTP method to change. So, for example, submitting a form to a permanently redirected resource may continue smoothly.
Not all redirection is treated equally; the redirection instruction sent to a browser can contain in its header HTTP response status codes such as 301 (moved permanently), 302 (found), 307 (temporary redirect) or 308 (permanent redirect). There are several techniques to implement URL shortening.
There are principally two types of redirects used: [note 2] HTTP 301 (permanent redirect) and HTTP 302 (regular redirect). In the former it is recommended that the site update the URL to use the new address. While in contrast, the latter is optional and should be reviewed by a human operator.
using redirection mechanisms such as HTTP 301 to automatically refer browsers and crawlers to relocated content. [citation needed] using content management systems which can automatically update links when content within the same site is relocated or automatically replace links with canonical URLs [24] integrating search resources into HTTP 404 ...
Chrome 3.0 threats HTTP 301 differently and will cache the URLs and redirect (on the client, without a server call) subsequent requests for the same URL to the moved location. But even in Chrome this "permanent" redirection only lasts for the current browser instance.