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; } /* special event: FTP / Gopher directory listing */ #dirmsg { font-family: courier; color: black; font-size: 10pt; } #dirlisting { margin-left: 2%; margin-right: 2%; } #dirlisting tr.entry td.icon,td.filename,td.size,td.date { border-bottom: groove; } #dirlisting td.size { width: 50px; text-align: right; padding-right: 5px; } /* horizontal lines */ hr { margin: 0; } /* page displayed footer area */ #footer { font-size: 9px; padding-left: 10px; } 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& 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
标签: 异常
