How to change ajax-charset?

Question

How can I change the default encoding used by $.post()?

The arguments are encoded with UTF-8. How can I encode it with ISO 8859-1?

Answer 1

See section 4.5.6.4.4.3 of the XHR spec: https://xhr.spec.whatwg.org/#the-send()-method

If contentTypeRecord is not failure, contentTypeRecord’s parameters["charset"] exists, and parameters["charset"] is not an ASCII case-insensitive match for "UTF-8", then:

Set contentTypeRecord’s parameters["charset"] to "UTF-8".

The spec forces browsers to always send as UTF-8.

You may however, use the fetch API. Since it's not an XHR, posting using fetch will honour your encoding.

fetch(url, {
  method: 'POST',
  headers: {
    'Content-Type': `text/plain; charset=${yourCustomEncoding}`
  },
  body
}).then(...