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95 lines
3.4 KiB
Markdown
[#]: subject: "Debug a web page error from the command line"
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[#]: via: "https://opensource.com/article/21/9/wget-debug-web-server"
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[#]: author: "Jim Hall https://opensource.com/users/jim-hall"
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[#]: collector: "lujun9972"
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[#]: translator: "geekpi"
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[#]: reviewer: " "
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[#]: publisher: " "
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[#]: url: " "
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从命令行调试网页错误
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======
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调试网络服务器的一种方法是使用 wget 命令行程序。
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![Digital creative of a browser on the internet][1]
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有时在管理一个网站时，事情会被搞得一团糟。你可能会删除一些陈旧的内容，用重定向到其他页面来代替。后来，在做了其他改动后，你发现一些网页变得完全无法访问了。你可能会在浏览器中看到一个错误：“该页面没有正确重定向”，并建议你检查你的 cookies。
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![Redirect loop example in Firefox][2]
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Screenshot by Jim Hall，[CC-BY SA 4.0][3]
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调试这种情况的一个方法是使用 `wget` 命令行程序，使用 `-S` 选项来显示所有的服务器响应。当使用 `wget` 进行调试时，我也喜欢使用 `-O` 选项将输出保存到一些临时文件中，以备以后需要查看其内容。
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```
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$ wget -O /tmp/test.html -S <http://10.0.0.11/announce/>
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\--2021-08-24 17:09:49-- <http://10.0.0.11/announce/>
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Connecting to 10.0.0.11:80... connected.
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HTTP request sent, awaiting response...
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HTTP/1.1 302 Found
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Date: Tue, 24 Aug 2021 22:09:49 GMT
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Server: Apache/2.4.48 (Fedora)
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X-Powered-By: PHP/7.4.21
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Location: <http://10.0.0.11/assets/>
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Content-Length: 0
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Keep-Alive: timeout=5, max=100
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Connection: Keep-Alive
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Content-Type: text/html; charset=UTF-8
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Location: <http://10.0.0.11/assets/> [following]
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\--2021-08-24 17:09:49-- <http://10.0.0.11/assets/>
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Reusing existing connection to 10.0.0.11:80.
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HTTP request sent, awaiting response...
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HTTP/1.1 302 Found
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Date: Tue, 24 Aug 2021 22:09:49 GMT
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Server: Apache/2.4.48 (Fedora)
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X-Powered-By: PHP/7.4.21
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Location: <http://10.0.0.11/announce/>
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Content-Length: 0
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Keep-Alive: timeout=5, max=99
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Connection: Keep-Alive
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Content-Type: text/html; charset=UTF-8
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Location: <http://10.0.0.11/announce/> [following]
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\--2021-08-24 17:09:49-- <http://10.0.0.11/announce/>
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Reusing existing connection to 10.0.0.11:80.
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.
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.
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.
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20 redirections exceeded.
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```
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我在这个输出中省略了很多重复的内容。通过阅读服务器的响应，你可以看到 `http://10.0.0.11/announce/` 立即重定向到 `http://10.0.0.11/assets/`，然后又重定向到 `http://10.0.0.11/announce/`。以此类推。这是一个无休止的循环，`wget` 将在 20 次重定向后退出。但有了这些调试信息，你可以修复重定向，避免循环。
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--------------------------------------------------------------------------------
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via: https://opensource.com/article/21/9/wget-debug-web-server
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作者：[Jim Hall][a]
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选题：[lujun9972][b]
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译者：[geekpi](https://github.com/geekpi)
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校对：[校对者ID](https://github.com/校对者ID)
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本文由 [LCTT](https://github.com/LCTT/TranslateProject) 原创编译，[Linux中国](https://linux.cn/) 荣誉推出
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[a]: https://opensource.com/users/jim-hall
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[b]: https://github.com/lujun9972
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[1]: https://opensource.com/sites/default/files/styles/image-full-size/public/lead-images/browser_web_internet_website.png?itok=g5B_Bw62 (Digital creative of a browser on the internet)
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[2]: https://opensource.com/sites/default/files/uploads/firefox-redirect-loop.png (Redirect loop example in Firefox)
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[3]: https://creativecommons.org/licenses/by-sa/4.0/ |