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The requested resource is available only through a proxy, the address for which is provided in the response. For security reasons, many HTTP clients (such as Mozilla Firefox and Internet Explorer) do not obey this status code. [10] 306 Switch Proxy No longer used. Originally meant "Subsequent requests should use the specified proxy."
In HTTP, "Referer" (a misspelling of "Referrer" [1]) is an optional HTTP header field that identifies the address of the web page (i.e., the URI or IRI) from which the resource has been requested. By checking the referrer, the server providing the new web page can see where the request originated.
The same is usually true even for programmers writing CGI scripts, though some servers allow scripts to add custom headers (e.g. by enabling "non-parsed-headers"). Many web servers will generate a 3xx status code if a script outputs a "Location:" header line. For example, in PHP, one can use the "header" function:
A query string is a part of a uniform resource locator that assigns values to specified parameters.A query string commonly includes fields added to a base URL by a Web browser or other client application, for example as part of an HTML document, choosing the appearance of a page, or jumping to positions in multimedia content.
Replies referring to the control and data connections. x3x: Authentication and accounting Replies for the login process and accounting procedures. x4x: Unspecified as of RFC 959. x5x: File system These replies indicate the status of the Server file system vis-a-vis the requested transfer or other file system action.
A link register (LR for short) is a register which holds the address to return to when a subroutine call completes. This is more efficient than the more traditional scheme of storing return addresses on a call stack, sometimes called a machine stack. The link register does not require the writes and reads of the memory containing the stack ...
The HTTP response status code 303 See Other is a way to redirect web applications to a new URI, particularly after a HTTP POST has been performed, since RFC 2616 (HTTP 1.1). According to RFC 7231, which obsoletes RFC 2616, "A 303 response to a GET request indicates that the origin server does not have a representation of the target resource ...
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 a 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.