UTF-8 GET using Indy 10.5.8.0 and Delphi XE2
- by Bogdan Botezatu
I'm writing my first Unicode application with Delphi XE2 and I've stumbled upon an issue with GET requests to an Unicode URL. Shortly put, it's a routine in a MP3 tagging application that takes a track title and an artist and queries Last.FM for the corresponding album, track no and genre.
I have the following code:
function GetMP3Info(artist, track: string) : TMP3Data //<---(This is a record)
var
TrackTitle,
ArtistTitle : WideString;
webquery : WideString;
[....]
WebQuery := UTF8Encode('http://ws.audioscrobbler.com/2.0/?method=track.getcorrection&api_key=' + apikey + '&artist=' + artist + '&track=' + track);
//[processing the result in the web query, getting the correction for the artist and title]
// eg: for artist := Bucovina and track := Mestecanis, the corrected values are
//ArtistTitle := Bucovina;
// TrackTitle := Mestecani?;
//Now here is the tricky part:
webquery := UTF8Encode('http://ws.audioscrobbler.com/2.0/?method=track.getInfo&api_key=' + apikey + '&artist=' + unescape(ArtistTitle) + '&track=' + unescape(TrackTitle));
//the unescape function replaces spaces (' ') with '+' to comply with the last.fm requests
[some more processing]
end;
The webquery looks in a TMemo just right (http://ws.audioscrobbler.com/2.0/?method=track.getInfo&api_key=e5565002840xxxxxxxxxxxxxx23b98ad&artist=Bucovina&track=Mestecani?)
Yet, when I try to send a GET() to the webquery using IdHTTP (with the ContentEncoding property set to 'UTF-8'), I see in Wireshark that the component is GET-ing the data to the ANSI value '/2.0/?method=track.getInfo&api_key=e5565002840xxxxxxxxxxxxxx23b98ad&artist=Bucovina&track=Mestec?ni?'
Here is the full headers for the GET requests and responses:
GET /2.0/?method=track.getInfo&api_key=e5565002840xxxxxxxxxxxxxx23b98ad&artist=Bucovina&track=Mestec?ni? HTTP/1.1
Content-Encoding: UTF-8
Host: ws.audioscrobbler.com
Accept: text/html, */*
Accept-Encoding: identity
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 6.1; en-US; rv:1.9.2.23) Gecko/20110920 Firefox/3.6.23 SearchToolbar/1.22011-10-16 20:20:07
HTTP/1.0 400 Bad Request
Date: Tue, 09 Oct 2012 20:46:31 GMT
Server: Apache/2.2.22 (Unix)
X-Web-Node: www204
Access-Control-Allow-Origin: *
Access-Control-Allow-Methods: POST, GET, OPTIONS
Access-Control-Max-Age: 86400
Cache-Control: max-age=10
Expires: Tue, 09 Oct 2012 20:46:42 GMT
Content-Length: 114
Connection: close
Content-Type: text/xml; charset=utf-8;
<?xml version="1.0" encoding="utf-8"?>
<lfm status="failed">
<error code="6">
Track not found
</error>
</lfm>
The question that puzzles me is am I overseeing anything related to setting the property of the tidhttp control? How can I stop the well-formated URL i'm composing in the application from getting wrongfully sent to the server?
Thanks.
