XMLHttpRequest request header encoding

Question

When I set custom request headers for XMLHttprequest with setRequestHeader(), how will it be encoded? There must be some encoding, because JavaScript strings are utf-16, and I don't think each character is sent as 2 bytes to the server. HTTP specifies headers to be iso-8859-1 encoded. Are the headers encoded to iso-8850-1? Or are they sent as utf-8? http://www.w3.org/TR/XMLHttpRequest/ says nothing about it.

Galdor · Accepted Answer · 2014-11-07 17:10:36Z

2

Meanwhile I did some tests:

Chrome v23, Linux: sends as utf-8

IE 9: sends as utf-8

FF 33, Linux: sends as iso-8859-1, does not send headers with characters outside of range

tested with äöü€

answered Nov 7, 2014 at 17:10

Galdor

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