# Trackback

## 주소 찾기

```html
<rdf:RDF xmlns:rdf="http://www.w3.org/1999/02/22-rdf-syntax-ns#"
         xmlns:dc="http://purl.org/dc/elements/1.1/"
         xmlns:trackback="http://madskills.com/public/xml/rss/module/trackback/">
    <rdf:Description
                     rdf:about="http://www.foo.com/archive.html#foo"
                     dc:identifier="http://www.foo.com/archive.html#foo"
                     dc:title="Foo Bar"
                     trackback:ping="http://www.foo.com/tb.cgi/5" />
</rdf:RDF>
```

## 전송

```
POST /trackback HTTP/1.1
Host: example.com
Content-Type: application/x-www-form-urlencoded; charset-utf-8

title=Foo+Bar&url=http://www.bar.com/&excerpt=My+Excerpt&blog_name=Foo
```

- title
- excerpt
- url
- blog_name

## 응답

```xml
<?xml version="1.0" encoding="utf-8"?>
<response>
    <error>0</error>
</response>
```

### 오류 응답

```xml
<?xml version="1.0" encoding="utf-8"?>
<response>
    <error>1</error>
    <message>The error message</message>
</response>
```