我正在尝试注册自定义路由，以验证登录页的groupon凭单代码。我在函数中注册了路由。php类似：

    // Adding Custom Voucher Route 

add_action(\'rest_api_init\',\'register_voucher_endpoint\');

function register_voucher_endpoint() {
    register_rest_route(
        \'voucher\',
        \'verify/(?<voucher_code>)\',
        array(
            \'methods\'=> \'POST\',
            \'callback\'=>\'verify_voucher\'
        ));
}


function verify_voucher($request) {
    return $request[\'voucher_code\']; 
}

我在表单操作上设置了如下链接

<form action="/voucher/verify" method="POST">
                            <h5 class="title">Please enter your 8-character Groupon Voucher Code to redeem your
                                purchase</h5>
                            <p>Note: You will have a voucher code for each product you buy on Groupon. For example,
                                if you bought 2 CBD sprays on Groupon, you\'ll have to enter 2 voucher codes, one
                                for each spray.</p> 
                                <input required="" class="branded-input margin-bottom" type="text"
                                minlength="8" maxlength="8" title="voucher-code" name="voucher-code" placeholder="Enter your 8 Character Groupon code">
                            <input type="submit" value="Redeem My CBD!" class="btn btn-color-primary btn-style-bordered btn-size-large">

当我单击提交按钮或手动转到注册的路由时，它会重定向到主页，网络选项卡显示“验证”路由返回301。站点正在使用重定向，但没有任何选项包括我注册的自定义路由。

两个主要问题：

为什么会发生这种重定向

function register_voucher_endpoint() {
    register_rest_route(
        \'voucher\',
        \'/verify/(?P<voucher_code>[a-zA-Z0-9-]+)\',
        array(
            \'methods\'=> \'POST\',
            \'callback\'=>\'verify_voucher\'
        ));
}