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Showing content from https://developer.mozilla.org/en-US/docs/Web/HTTP/Reference/Methods/PUT below:

PUT - HTTP | MDN

PUT

The PUT HTTP method creates a new resource or replaces a representation of the target resource with the request content.

The difference between PUT and POST is that PUT is idempotent: calling it once is no different from calling it several times successively (there are no side effects).

Syntax

PUT <request-target>["?"<query>] HTTP/1.1

<request-target>: Identifies the target resource of the request when combined with the information provided in the Host header. This is an absolute path (e.g., /path/to/file.html) in requests to an origin server, and an absolute URL in requests to proxies (e.g., http://www.example.com/path/to/file.html).
<query> Optional: An optional query component preceded by a question-mark ?. Often used to carry identifying information in the form of key=value pairs.

Examples Successfully creating a resource

The following PUT request asks to create a resource at example.com/new.html with the content <p>New File</p>:

PUT /new.html HTTP/1.1
Host: example.com
Content-type: text/html
Content-length: 16

<p>New File</p>

If the target resource does not have a current representation and the PUT request successfully creates one, then the origin server must send a 201 Created response:

HTTP/1.1 201 Created
Content-Location: /new.html

If the target resource does have a current representation and that representation is successfully modified with the state in the request, the origin server must send either a 200 OK or a 204 No Content to indicate successful completion of the request:

HTTP/1.1 204 No Content
Content-Location: /existing.html

Specifications Browser compatibility

The browser doesn't use the PUT method for user-initiated actions, so "browser compatibility" doesn't apply. Developers can set this request method using fetch().