XMLHttpRequest

https://developer.mozilla.org/en-US/docs/Web/API/FormData/Using_FormData_Objects

• https://developer.mozilla.org/en-US/docs/Web/API/FormData

  • https://developer.mozilla.org/en-US/docs/Web/API/FormData/Using_FormData_Objects

• https://learn.javascript.ru/xmlhttprequest

  • https://learn.javascript.ru/xhr-forms (OLD)