encoding of query string parameters in IE10

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Yes, your observation of the behavior is accurate. Internet Explorer 10 and below follow a complicated algorithm for encoding the URL. This was allegedly updated in Internet Explorer 11, but I’ve found that the new option doesn’t seem to work.

The “Always show encoded addresses option” concerns whether PunyCode is shown for IDN hostnames, and does not impact the query string. Send UTF-8 URLs mostly applies to the encoding of the path, although it can also affect other codepaths

The behavior isn’t fully documented anywhere. I’d meant to write a full post on my IEInternals blog about it but ended up moving on from Microsoft before doing so. There’s a partial explanation in this blog post.

Yes, there are settings that impact the behavior. The Send UTF-8 URLs checkbox inside Tools > Internet Options > Advanced is one of the variables that determines how URLs are sent, but the option does not blindly do what it implies (it only UTF-8 encodes the path, not the query string). Other variables involved include:

  1. Where the URL was typed (e.g. address bar vs. Start > Run, etc)
  2. What the system’s ANSI codepage is (e.g. what locale the OS uses as default)
  3. The charset of the currently loaded page in the browser

As a consequence of these variables, you cannot reliably use URLs which are not properly encoded (e.g. %-escaped UTF8) in Internet Explorer.

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