I'm using wp_remote_post() on a project and it works great. But seems like the server on which I need to make the POST request is a Windows (ISS) server. So the third-party service that provides this specific endpoint requires that all POST requests has a Windows-1252 character encoding, otherwise there will be issues with special characters (like á, é, û, etc).

I did some research and seems like the way to go is to set a Content-Type HTTP header which includes a charset (like charset=Windows-1252). Tried to add the charset along with the content type (like application/x-www-form-urlencoded;charset=Windows-1252), but nothing seems to work.

Does anyone know how to proper set the charset for an HTTP POST request using wp_remote_post()?

Thanks in advance!

  • Normally the charset is assigned with =, so you could try application/x-www-form-urlencoded;charset=Windows-1252
    – birgire
    Jun 11, 2017 at 11:11
  • I noticed that according to this list the Content-Type is a response field, not a request field. I thought it was also valid as a request field? There we see e.g. the Accept-Charset request field, but I'm don't think that's what you need. Have you tried encoding the POST data manually ?
    – birgire
    Jun 12, 2017 at 16:11
  • 1
    @birgire you're totally right, and that's what I was using, the snippet here is incorrect but on my source code it is correct. Just fixed the typo on my question. Jun 12, 2017 at 16:14
  • @birgire actually on the link you sent the Content-Type is also a request field. And to define the charset, it seems that this is the correct approach: w3.org/International/articles/http-charset/index.en Jun 12, 2017 at 16:19
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    @birgire thanks for the help, your tip about encoding the POST data, I found a workaraound! See my answer below. Jun 18, 2017 at 19:56

1 Answer 1


After trying several times to set the proper charset, I wasn't successful. Then I searched for an workaround and found one that worked with my problem.

In addition to set the charset like I mentioned above, what I did is to convert all strings on my POST body with this php snippet:

$message = @iconv("UTF-8","Windows-1252//IGNORE",$message);

This converts all of your characters into compatible Windows-1252 strings. For me, it worked, and all special characters are properly recognizable on the ISS server.

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