我想使用 rebol 下载我博客的 xml 备份
http://reboltutorial.com/wp-admin/export.php
形式是
<form action="" method="get">
<h3>Options</h3>
<table class="form-table">
<tr>
<th><label for="author">Restrict Author</label></th>
<td>
<select name="author" id="author">
<option value="all" selected="selected">All Authors</option>
<option value='1'>admin</option></select>
</td>
</tr>
</table>
<p class="submit"><input type="submit" name="submit" class="button" value="Download Export File" />
<input type="hidden" name="download" value="true" />
</p>
</form>
我想我首先需要登录http://reboltutorial.com/login/然后然后呢？做类似事情的任何代码示例（获取cookie，...）？
<form name="loginform" id="loginform" action="" method="post">
<p>
<label>Username<br />
<input type="text" name="log" id="user_login" class="input" value="" size="20" /></label>
</p>
<p>
<label>Password<br />
<input type="password" name="pwd" id="user_pass" class="input" value="" size="20" /></label>
</p>
<p class="forgetmenot"><label><input name="rememberme" type="checkbox" id="rememberme" value="forever" /> Remember Me</label></p>
<p class="submit">
<input type="hidden" name="post-from" id="post-from" value="page" />
<input type="hidden" name="action" id="action" value="login" />
<input type="submit" name="wp-submit" id="wp-submit" value="Log In" />
<input type="hidden" name="redirect_to" value="http://reboltutorial.com/wp-admin/" />
<input type="hidden" name="testcookie" value="1" />
</p>
</form>