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

POST request method - HTTP

Baseline Widely available

The POST HTTP method sends data to the server. The type of the body of the request is indicated by the Content-Type header.

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). Successive identical POST requests may have additional effects, such as creating the same order several times.

HTML forms typically send data using POST and this usually results in a change on the server. For HTML forms the format/encoding of the body content is determined by the enctype attribute of the <form> element or the formenctype attribute of the <input> or <button> elements. The encoding may be one of the following:

• application/x-www-form-urlencoded: the keys and values are encoded in key-value tuples separated by an ampersand (&), with an equals symbol (=) between the key and the value (e.g., first-name=Frida&last-name=Kahlo). Non-alphanumeric characters in both keys and values are percent-encoded: this is the reason why this type is not suitable to use with binary data and you should use multipart/form-data for this purpose instead.
• multipart/form-data: each value is sent as a block of data ("body part"), with a user agent-defined delimiter (for example, boundary="delimiter12345") separating each part. The keys are described in the Content-Disposition header of each part or block of data.
• text/plain

When the POST request is sent following a fetch() call, or for any other reason than an HTML form, the body can be any type. As described in the HTTP 1.1 specification, POST is designed to allow a uniform method to cover the following functions:

• Annotation of existing resources
• Posting a message to a bulletin board, newsgroup, mailing list, or similar group of articles
• Adding a new user through a signup form
• Providing a block of data, such as the result of submitting a form, to a data-handling process
• Extending a database through an append operation

POST <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.

A form using application/x-www-form-urlencoded content encoding (the default) sends a request where the body contains the form data in key=value pairs, with each pair separated by an & symbol, as shown below:

POST /test HTTP/1.1
Host: example.com
Content-Type: application/x-www-form-urlencoded
Content-Length: 27

field1=value1&field2=value2

The multipart/form-data encoding is used when a form includes files or a lot of data. This request body delineates each part of the form using a boundary string. An example of a request in this format:

POST /test HTTP/1.1
Host: example.com
Content-Type: multipart/form-data;boundary="delimiter12345"

--delimiter12345
Content-Disposition: form-data; name="field1"

value1
--delimiter12345
Content-Disposition: form-data; name="field2"; filename="example.txt"

value2
--delimiter12345--

The Content-Disposition header indicates how the form data should be processed, specifying the field name and filename, if appropriate.

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