I can't change HTTP request header Content-Type value using jQuery

Question

I tried to override HTTP request header content by using jQuery's AJAX function. It looks like this

$.ajax({
  type : "POST",
  url : url,
  data : data,
  contentType: "application/x-www-form-urlencoded;charset=big5",
  beforeSend: function(xhr) {
      xhr.setRequestHeader("Accept-Charset","big5");
      xhr.setRequestHeader("Content-Type","application/x-www-form-urlencoded;charset=big5");
  },
  success: function(rs) {
    target.html(rs);
  }
});

Content-Type header is default to "application/x-www-form-urlencoded; charset=UTF-8", but it obviously I can't override its value no matter I use 'contentType' or 'beforeSend' approaches. Could anyone adivse me a hint that how do I or can I change the HTTP request's content-type value? thanks a lot.

btw, is there any good documentation that I can study JavaScript's XMLHttpRequest's encoding handling?

See stackoverflow.com/questions/1145588/…, a duplicate question to this one. — Jim Ferrans
– Jim Ferrans, Commented Oct 30, 2009 at 5:23
@Jim: not really; that other Q is about the Accept header, not about setting the content-type. — Martijn Pieters
– Martijn Pieters, Commented May 7, 2011 at 22:37
From the jQuery ajax documentation: Data will always be transmitted to the server using UTF-8 charset; you must decode this appropriately on the server side. api.jquery.com/jQuery.ajax — Bkress
– Bkress, Commented May 20, 2011 at 20:50

Edgar · Accepted Answer · 2011-06-10 15:25:40Z

2

According to the jQuery docs, charset will always be UTF-8: http://jqapi.com/#p=jQuery.ajax. I guess the same goes for accept-charset.

Big5 is a subset of UTF-8, right? So it should be possible to encode and decode it server-side.

answered Jun 10, 2011 at 15:25

Edgar

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1 Comment

Roland Illig Over a year ago

[nitpicking] No, Big5 is not a subset of UTF-8, but it may well be a subset of Unicode.

Scott Evernden · Accepted Answer · 2009-10-30 05:20:24Z

0

Have you checked the w3.org documentation? There appears to be some limitation in using Accept-Charset header. http://www.w3.org/TR/XMLHttpRequest/#the-setrequestheader-method

answered Oct 30, 2009 at 5:20

Scott Evernden

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1 Comment

Matt Over a year ago

thanks, but even Accept-Charset is removed, problem remains the same.

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