peticion.http

Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.9
Accept-Encoding: gzip, deflate, br
Accept-Language: es-ES,es;q=0.9,en;q=0.8
Cache-Control: no-cache
Connection: keep-alive
Content-Length: 46

#El formato de la petición POST del navegador.
#Las aplicaciones modernas ya casi no utilizan el formato 'x-www-form-urlencoded', sino el formato json.
Content-Type: application/x-www-form-urlencoded

Host: localhost
Origin: http://localhost
Pragma: no-cache
Referer: http://localhost/contacts-app/add.php
sec-ch-ua: "Chromium";v="92", " Not A;Brand";v="99", "Google Chrome";v="92"
sec-ch-ua-mobile: ?0
Sec-Fetch-Dest: document
Sec-Fetch-Mode: navigate
Sec-Fetch-Site: same-origin
Sec-Fetch-User: ?1
Upgrade-Insecure-Requests: 1
User-Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/92.0.4515.159 Safari/537.36

#Lo que ha mandado el navegador al dar al boton de submit
#Así es como se vería la petición 'POST' del navegador
#Se llama array asociativo, ya que es un array que asocia valores con claves
name=Sergio&phone_number=65432143

# array(2) {
#   ["name"]=>
#   string(6) "Sergio"
#   ["phone_number"]=>
#   string(8) "65432143"
# }