在开发过程中，调用对外接口，返回了一长串的标签提示，如下

<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN" "http://www.w3.org/TR/html4/strict.dtd">

<html><head>

<meta type="copyright" content="Copyright (C) 1996-2017 The Squid Software Foundation and contributors">

<meta http-equiv="Content-Type" content="text/html; charset=utf-8">

<title>ERROR: The requested URL could not be retrieved</title>

<style type="text/css"><!--

 /*

 * Copyright (C) 1996-2017 The Squid Software Foundation and contributors

 *

 * Squid software is distributed under GPLv2+ license and includes

 * contributions from numerous individuals and organizations.

 * Please see the COPYING and CONTRIBUTORS files for details.

 */

/*

 Stylesheet for Squid Error pages

 Adapted from design by Free CSS Templates

 http://www.freecsstemplates.org

 Released for free under a Creative Commons Attribution 2.5 License

*/

/* Page basics */

* {

    font-family: verdana, sans-serif;

}

html body {

    margin: 0;

    padding: 0;

    background: #efefef;

    font-size: 12px;

    color: #1e1e1e;

}

/* Page displayed title area */

#titles {

    margin-left: 15px;

    padding: 10px;

    padding-left: 100px;

    background: url('/squid-internal-static/icons/SN.png') no-repeat left;

}

/* initial title */

#titles h1 {

    color: #000000;

}

#titles h2 {

    color: #000000;

}

/* special event: FTP success page titles */

#titles ftpsuccess {

    background-color:#00ff00;

    width:100%;

}

/* Page displayed body content area */

#content {

    padding: 10px;

    background: #ffffff;

}

/* General text */

p {

}

/* error brief description */

#error p {

}

/* some data which may have caused the problem */

#data {

}

/* the error message received from the system or other software */

#sysmsg {

}

pre {

    font-family:sans-serif;

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/* special event: FTP / Gopher directory listing */

#dirmsg {

    font-family: courier;

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#dirlisting {

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#dirlisting tr.entry td.icon,td.filename,td.size,td.date {

    border-bottom: groove;

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#dirlisting td.size {

    width: 50px;

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hr {

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#footer {

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body

:lang(fa) { direction: rtl; font-size: 100%; font-family: Tahoma, Roya, sans-serif; float: right; }

:lang(he) { direction: rtl; }

 --></style>

</head><body id=ERR_ACCESS_DENIED>

<div id="titles">

<h1>ERROR</h1>

<h2>The requested URL could not be retrieved</h2>

</div>

<hr>

<div id="content">

<p>The following error was encountered while trying to retrieve the URL: <a href="https://cloud.zdns.cn/*">https://cloud.zdns.cn/*</a></p>

<blockquote id="error">

<p><b>Access Denied.</b></p>

</blockquote>

<p>Access control configuration prevents your request from being allowed at this time.

Please contact your service provider if you feel this is incorrect.</p>

<p>Your cache administrator is

 <a href="mailto:webmaster?subject=CacheErrorInfo%20-%20ERR_ACCESS_DENIED&amp;

 body=CacheHost%3A%20xzproxy01%0D%0AErrPage%3A%20ERR_ACCESS_DENIED%0D%0AErr%3A%20%

 5Bnone%5D%0D%0ATimeStamp%3A%20Fri,%2013%20Mar%202020%2002%3A56%3A20%20GMT%0D%0A%0D%

 0AClientIP%3A%2010.49.9.125%0D%0A%0D%0AHTTP%20Request%3A%0D%0ACONNECT%20%2F%20HTTP%2F1.1%0

 AUser-Agent%3A%20Apache-HttpClient%2F4.5.2%20(Java%2F1.8.0_181)%0D%0AHost%3A%20cloud.zdns.c

 n%3A443%0D%0A%0D%0A%0D%0A">webmaster</a>.</p>

<br>

</div>

<hr>

<div id="footer">

<p>Generated Fri, 13 Mar 2020 02:56:20 GMT by xzproxy01 (squid/3.5.25)</p>

<!-- ERR_ACCESS_DENIED -->

</div>

</body></html>

　　该提示之后，发现请求不通，代理服务器拦截了这个请求，squid是代理服务器控制软件。在网上搜了下，看到一篇不错的文章，

链接如下，用于扩充吧

The requested URL could not be retrieved/ TCP_DENIED/403

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