The values are sent in the request body, in the format that the content type specifies.
Usually the content type is application/x-www-form-urlencoded, so the request body uses the same format as the query string:
parameter=value&also=another
When you use a file upload in the form, you use the multipart/form-data encoding instead, which has a different format. It’s more complicated, but you usually don’t need to care what it looks like, so I won’t show an example, but it can be good to know that it exists.
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