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HTTP POST request is used for sending data to a server. You can use POST requests for upload a file or submitting a web form, make sure that the receiving application agrees on the format.
Additional headers are sent with the POST request: Content-Type: header which is usually application/x-www-form-urlencoded and the Content-Length: header gives the length of the URL-encoded form data. These additional headers are used to describe the message body.

The POST body is the block of data sent with the request and the request URI is not a resource to retrieve; it’s usually an application to handle the data you’re sending.
The HTTP response is normally application response to your file upload request or form submission, not a static file.

You can check related posts, what is HTTP, and what is HTTP GET request.

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