title: FormData: change the field charset
body: <p>According to this post <a href="https://stackoverflow.com/questions/4085449/multipart-form-data-what-is-the-default-charset-for-fields">multipart/form-data, what is the default charset for fields?</a> , posting a formdata, the default charset of the fields is ISO-8859-1.</p>
  
  <p>When I send a FormData (with or without jquery), the FormData is parsed by the browser which constructs the request, but I couldn't force the charset by field (no way to change the way the browser parse the FormData).</p>
  
  <p>However, if I don't specify this charset by field, then my server receives latin1 encoding (whereas I need UTF-8). Is there any way to force this charset, with or without js library?</p>
  
  <p>For information, the charset cannot be set in the global Content-Type with FormData (if I force the content-type then it breaks the "boundary" tag so the server cannot parse the data). </p>