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The PATCH method is not idempotent. It can be made idempotent by using a conditional request. [ 1 ] When a client makes a conditional request to a resource, the request succeeds only if the resource has not been updated since the client last accessed that resource.
404 Not Found The requested resource could not be found but may be available in the future. Subsequent requests by the client are permissible. 405 Method Not Allowed A request method is not supported for the requested resource; for example, a GET request on a form that requires data to be presented via POST, or a PUT request on a read-only ...
Similarly, a request to DELETE a certain user will have no effect if that user has already been deleted. In contrast, the methods POST, CONNECT, and PATCH are not necessarily idempotent, and therefore sending an identical POST request multiple times may further modify the state of the server or have further effects, such as sending multiple ...
A sequence of idempotent subroutines where at least one subroutine is different from the others, however, is not necessarily idempotent if a later subroutine in the sequence changes a value that an earlier subroutine depends on—idempotence is not closed under sequential composition. For example, suppose the initial value of a variable is 3 ...
A rule of thumb in determining if a reply fits into the 4xx or the 5xx (Permanent Negative) category is that replies are 4xx if the commands can be repeated without any change in command form or in properties of the User or Server (e.g., the command is spelled the same with the same arguments used; the user does not change his file access or ...
Search engines might not pass the SEO value to the new URL. [5] 307 Temporary Redirect: Like 302, but guarantees that the method and the body will not be changed when the redirected request is made. 303 See Other: Used when the result of a POST or another non-idempotent request method is a resource that should be retrieved using a GET.
Per RFC 7231, the POST method is not idempotent, meaning that multiple identical requests might not have the same effect as transmitting the request only once.POST is therefore suitable for requests which change the state each time they are performed, for example submitting a comment to a blog post or voting in an online poll.
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