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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 ...
Therefore, HTTP/1.1 added status codes 303 and 307 to distinguish between the two behaviours. [1]: §15.4 303 See Other (since HTTP/1.1) The response to the request can be found under another URI using the GET method. When received in response to a POST (or PUT/DELETE), the client should presume that the server has received the data and should ...
Under HTTP 1.0, connections should always be closed by the server after sending the response. [1]Since at least late 1995, [2] developers of popular products (browsers, web servers, etc.) using HTTP/1.0, started to add an unofficial extension (to the protocol) named "keep-alive" in order to allow the reuse of a connection for multiple requests/responses.
302 found (originally "temporary redirect" in HTTP/1.0 and popularly used for CGI scripts; superseded by 303 and 307 in HTTP/1.1 but preserved for backward compatibility) 303 see other (forces a GET request to the new URL even if original request was POST) 305 use proxy (indicates that the client's requested resource is only available through a ...
Diagram of a double POST problem encountered in user agents. Diagram of the double POST problem above being solved by PRG. Post/Redirect/Get (PRG) is a web development design pattern that lets the page shown after a form submission be reloaded, shared, or bookmarked without ill effects, such as submitting the form another time.
A request that upgrades from HTTP/1.1 to HTTP/2 MUST include exactly one HTTP2-Settings header field. The HTTP2-Settings header field is a connection-specific header field that includes parameters that govern the HTTP/2 connection, provided in anticipation of the server accepting the request to upgrade.
[7] [a] On February 25, 2008, the W3C published the Working Draft Level 2 specification. [8] Level 2 added methods to monitor event progress, allow cross-site requests, and handle byte streams. At the end of 2011, the Level 2 specification was absorbed into the original specification.
Unless the request method was HEAD, the entity should contain a small hypertext note with a hyperlink to the new URL(s). If the 301 status code is received in response to a request of any type other than GET or HEAD, the client must ask the user before redirecting.