Php Google Apps电子邮件审计API：发布创建用户监视器的请求'；s邮箱

使用谷歌应用程序电子邮件审核API尝试创建一个监视器，该监视器将复制用户邮箱中的所有信件rabbit@mydomain.com至auditor@mydomain.com。在接收到错误消息时：“prolog中不允许有内容。”

$url='1！'https://apps-apis.google.com/a/feeds/compliance/audit/mail/monitor/mydomain.com/rabbit';
$txtXML=”

关于授权请求：
https://developers.google.com/admin-sdk/email-audit/auth

对服务器到服务器应用程序使用OAuth 2.0：
https://developers.google.com/identity/protocols/OAuth2ServiceAccount

 $url = 'https://apps-apis.google.com/a/feeds/compliance/audit/mail/monitor/mydomain.com/rabbit';

 $txtXML  = "<atom:entry xmlns:atom='http://www.w3.org/2005/Atom' xmlns:apps='http://schemas.google.com/apps/2006'>";
 $txtXML .= "<apps:property name='destUserName' value='auditor'/>";
 $txtXML .= "<apps:property name='endDate' value='2015-12-31 00:00'/>";
 $txtXML .= "</atom:entry>";

 $post_data = array( "xml" => $txtXML );

 $context = stream_context_create(
     array( 'http' => array(
              'method' => 'POST',
              'header'  => 'Content-length: '. strlen( $txtXML ) . PHP_EOL .
              'Content-type: application/atom+xml' . PHP_EOL . 
              'Authorization: Bearer ' . trim( $accessToken2v3 ) . PHP_EOL .
              '',
              'content' => http_build_query( $post_data )
              )
          )
 );

 $response = file_get_contents( $url, false, $context );