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微信支付退款接口返回501

https://api.mch.weixin.qq.com/secapi/pay/refund

请求参数:

<?xml version="1.0" encoding="UTF-8" standalone="no"?>

<xml>

<transaction_id>4200000983202103169424794341</transaction_id>

<refund_desc>SELECT

*

FROM

hp_supplier.certificate 

WHERE

order_item_id = (

SE</refund_desc>

<nonce_str>3iK67uul4qV1p3PzsfmABsnkJmEptlrX</nonce_str>

<out_refund_no>1371653782945009664</out_refund_no>

<sign>34B9E326505DB52C610C22CE81BD3979</sign>

<sub_appid>wx2c275785e1d97e01</sub_appid>

<sub_mch_id>1605543578</sub_mch_id>

<notify_url>https://dev-api.liuwa.co/notify/v2/refund</notify_url>

<mch_id>1539442211</mch_id>

<total_fee>2</total_fee>

<refund_fee>2</refund_fee>

<appid>wxf32298a71c55ba76</appid>

<sign_type>MD5</sign_type>

</xml>

响应:

<html>

<head><title>501 Not Implemented</title></head>

<body bgcolor="white">

<center><h1>501 Not Implemented</h1></center>

<hr><center>nginx</center>

</body>

</html>


请问下返回501是啥情况啊


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