响应码：外部链接 4xx 错误
站内链接到的外部网址返回 4xx 错误，例如 400、403、404（页面不存在，即常说的死链）、410、429 等。
如何修复：把失效的外部链接更新为正确地址或删除。403 通常是对方服务器拒绝爬虫访问，如果在浏览器里能正常打开，一般不是问题。下方「出现在」一列给出链接所在页面和锚文本。
Screaming Frog 英文原文
External URLs with a client-side error. This indicates a problem occurred with the URL request and can include responses such as 400 bad request, 403 Forbidden, 404 Page Not Found, 410 Removed, 429 Too Many Requests and more. A 404 'Page Not Found' is the most common, and often referred to as a broken link. View URLs that link to errors using the lower 'inlinks' tab and export them in bulk via 'Bulk Export > Response Codes > External > Client Error (4xx) inlinks'.
How to fix: All links on a website should ideally resolve to 200 'OK' URLs. Errors such as 404 broken links should be updated so users are taken to the correct URL, or removed. A 403 forbidden error occurs when a web server denies access to the SEO Spider's request and can often be resolved by switching the user-agent to Chrome via 'Config > User-Agent'. If they can be viewed in a browser, then it's often not an issue.
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