CodeIgniter的URI和表单操作

假设我们在

somesite.com/mail

这意味着我们使用名为mail的控制器。此控制器具有以下功能：

it means we are using controller named 'mail'. This controller has function:

public function index(){ 
        $this->load->view('header');
        $this->load->view('mail/contact_form');
        $this->load->view('footer');

    }

此函数在我们输入地址栏时加载

This function is loaded when we type in adress bar just

somesite.com/mail

并按Enter键（无附加参数）。让我们看看contact_form视图的第一行：

and press enter (no additional arguments). And let's see first line of the contact_form view:

<form role="form" method="post" action="sendmail">

这是我的问题。当我用反斜杠键入地址时，如下所示：

And that's my problem. When I type adress with backslash on the end like this:

mysite.com/mail/

并使用我的联系人公式，一切正常，我的邮件控制器加载函数sendmail，现在的URL是：

and use my contact formula, everything works good and my Mail controller loads function sendmail and the URL is now:

mysite.com/mail/sendmail/

但是当我忘记反斜杠（mysite.com/mail），它寻找的控制器名为sendmail，但我不想要它。我的网址为：

But when I forget about backslash (mysite.com/mail), it looks for controller named "sendmail" but I don't want it. My url is then:

mysite.com/sendmail

但是我没有任何控制器名为sendmail。我的问题是 - 如何改变我的公式的行动或我该怎么做，使这工作良好？是唯一的答案记住反斜杠或什么？

but of course I don't have any controllers named sendmail. My question is - how to change action of my formula or what should I do to make this working good? Is the only answer to remember about backslash or what?