xml utf-8 encoding error

[graw-prog via Digitalmars-d-learn]

Hi, I'm having some trouble getting an xml file using 
std.net.curl. I'm using get() to receive device info from a roku 
television using this code:


char[] inputQuery(string input) {
     string url = ip ~ "query/" ~ input;
     auto client = HTTP();

     auto content = get(url,client);


     return content;
}


I've had no problem in the past using similar code to receive 
JSON data from a web server. However in this case I run into this 
error:


std.encoding.EncodingException at std/encoding.d(2346): Unrecognized 
Encoding: "utf-8"
----------------
??:? std.encoding.EncodingScheme 
std.encoding.EncodingScheme.create(immutable(char)[]) [0x9773ff]
/usr/include/dmd/phobos/std/net/curl.d:1196 char[] 
std.net.curl._decodeContent!(char)._decodeContent(ubyte[], 
immutable(char)[]) [0x7951cb]
/usr/include/dmd/phobos/std/net/curl.d:1049 char[] 
std.net.curl._basicHTTP!(char)._basicHTTP(const(char)[], 
const(void)[], std.net.curl.HTTP) [0x793559]
/usr/include/dmd/phobos/std/net/curl.d:540 char[] 
std.net.curl.get!(std.net.curl.HTTP, char).get(const(char)[], 
std.net.curl.HTTP) [0x795b77]
source/backend.d:26 immutable(char)[] 
backend.inputQuery(immutable(char)[]) [0x7886bd]


When I use cURL directly to get the info I get this:


curl -v --request  GET http://192.168.1.140:8060/query/device-info

  Connected to 192.168.1.140 (192.168.1.140) port 8060 (#0)
> GET /query/device-info HTTP/1.1
> Host: 192.168.1.140:8060
> User-Agent: curl/7.47.0
> Accept: */*
> 
< HTTP/1.1 200 OK
< Server: Roku UPnP/1.0 MiniUPnPd/1.4
< Content-Length: 1826
< Cache-Control: no-cache
< Content-Type: text/xml; charset="utf-8"
<
<?xml version="1.0" encoding="UTF-8" ?>


This seems to be the relevant code in curl.d:

private auto _decodeContent(T)(ubyte[] content, string encoding)
{
     static if (is(T == ubyte))
     {
         return content;
     }
     else
     {
         import std.format : format;

         // Optimally just return the utf8 encoded content
         if (encoding == "UTF-8"||encoding == "utf-8")
             return cast(char[])(content);

         // The content has to be re-encoded to utf8
         auto scheme = EncodingScheme.create(encoding);
         enforce!CurlException(scheme !is null,
                                 format("Unknown encoding '%s'", 
encoding));

I'm not sure what the problem is. It seems to be may the 
lowercase 'utf-8' in the charset section but I'm not sure if the 
problem is some mistake I made, a bug in DMD or just lousy xml. 
Either way is there any way around this issue?