问谁能告诉我如何从此$http标头中删除印前检查请求

EN

    //individual logins
    $rootScope.setting.instances.forEach(function(ins) {

        var header = { 
                    "Accept": "application/json",
                    "Authorization": "Basic " + btoa( ins.uname + ':' + ins.pword ),
                    "Access-Control-Allow-Origin" : "*",
                    "Access-Control-Allow-Methods" : "GET, POST, DELETE, PUT, JSONP"

                };      

         $http({ method : 'post', url : ins.url, headers: header })
         .success( function( data )
         {
            console.log( ins.name +" login success" );
            $("#fail" + ins.id ).hide();
            $("#succ" + ins.id ).show();
            //logins : a global variable declared in app.js
            logins.push('{"ins" : '+ ins.id + ',"isAvailable" : "true"}');
            checkFinished();
         })
         .error( function( data)
         {
            console.log( ins.name +" login failed" );
            $("#fail" + ins.id ).show();
            $("#succ" + ins.id ).hide();
            //logins : a global variable declared in app.js
            logins.push('{"ins" : '+ ins.id + ',"isAvailable" : "false"}');
            checkFinished();
         });
    });
}