Bad HTTP request when query contains a space

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It can be demonstrated like:

read append http://httpbin.org/get?q= {Test query}

with this output:

 [HTTP] Opening connection: tcp://httpbin.org:80
 [HTTP] Request: {GET /get?q=Test query HTTP/1.1^M
Host: httpbin.org^M
Accept: */*^M
Accept-charset: utf-8^M
Accept-Encoding: gzip,deflate,br^M
User-Agent: rebol/3.17.1 (Windows; x64)^M
}
 [HTTP] HTTP/1.1 400 Bad Request
 [HTTP] Headers: [
    Content-Length: "202"
    Content-Encoding: none
    Transfer-Encoding: none
    Last-Modified: none
    Date: "Mon, 15 Jul 2024 12:13:16 GMT"
    Content-Type: "text/html"
    Connection: "keep-alive"
]