总结

1、

502没有收到相应,或者收到了但不及时? cannot get a response in time

540收到了无效的响应 received an invalid response from the upstream server,

HTTP/1.1: Status Code Definitions https://www.w3.org/Protocols/rfc2616/rfc2616-sec10.html#sec10

10.5 Server Error 5xx

Response status codes beginning with the digit "5" indicate cases in which the server is aware that it has erred or is incapable of performing the request. Except when responding to a HEAD request, the server SHOULD include an entity containing an explanation of the error situation, and whether it is a temporary or permanent condition. User agents SHOULD display any included entity to the user. These response codes are applicable to any request method.

10.5.1 500 Internal Server Error

The server encountered an unexpected condition which prevented it from fulfilling the request.

10.5.2 501 Not Implemented

The server does not support the functionality required to fulfill the request. This is the appropriate response when the server does not recognize the request method and is not capable of supporting it for any resource.

10.5.3 502 Bad Gateway

The server, while acting as a gateway or proxy, received an invalid response from the upstream server it accessed in attempting to fulfill the request.

10.5.4 503 Service Unavailable

The server is currently unable to handle the request due to a temporary overloading or maintenance of the server. The implication is that this is a temporary condition which will be alleviated after some delay. If known, the length of the delay MAY be indicated in a Retry-After header. If no Retry-After is given, the client SHOULD handle the response as it would for a 500 response.

      Note: The existence of the 503 status code does not imply that a
server must use it when becoming overloaded. Some servers may wish
to simply refuse the connection.

10.5.5 504 Gateway Timeout

The server, while acting as a gateway or proxy, did not receive a timely response from the upstream server specified by the URI (e.g. HTTP, FTP, LDAP) or some other auxiliary server (e.g. DNS) it needed to access in attempting to complete the request.

      Note: Note to implementors: some deployed proxies are known to
return 400 or 500 when DNS lookups time out.

10.5.6 505 HTTP Version Not Supported

The server does not support, or refuses to support, the HTTP protocol version that was used in the request message. The server is indicating that it is unable or unwilling to complete the request using the same major version as the client, as described in section 3.1, other than with this error message. The response SHOULD contain an entity describing why that version is not supported and what other protocols are supported by that server.

 

Cause of 502 Bad Gateway Errors

Bad Gateway errors are often caused by issues between online servers that you have no control over. However, sometimes, there is no real issue but your browser thinks there is one thanks to an issue with your browser, a problem with your home networking equipment, or some other in-your-control reason.

 

Microsoft IIS web servers often give more information about the cause of a particular 502 Bad Gateway error by adding an extra digit after the 502, as in HTTP Error 502.3 - Web server received an invalid response while acting as a gateway or proxy, which means Bad Gateway: Forwarder Connection Error (ARR). You can see a complete list here.

An HTTP Error 502.1 - Bad Gateway error refers to a CGI application timeout problem and is better to troubleshoot as a 504 Gateway Timeout issue.

The HTTP status code in IIS 7.0, IIS 7.5, and IIS 8.0 https://support.microsoft.com/en-us/help/943891/the-http-status-code-in-iis-7-0-iis-7-5-and-iis-8-0

How to Fix the 504 Gateway Timeout Error

  1. Retry the web page by clicking the refresh/reload button, pressing F5, or trying the URL from the address bar again.
    1. Even though the 504 Gateway Timeout error is reporting an error outside of your control, the error might only be temporary. Simply retrying the page is a quick and easy thing to try.
  2. Restart all of your network devices. Temporary problems with your modem, routerswitches, or other networking hardware could be causing the 504 Gateway Timeout issue you're seeing. Just restarting these devices could help.
    1. Tip: While the order you turn off these devices isn't important, the order that you turn them back on is. In general, you want to turn devices on from the outside-in. If you're not sure what that means, check out the link at the beginning of this step for a complete tutorial.
  3. Check the proxy server settings in your browser or application and make sure they're correct. Incorrect proxy settings can cause 504 errors.
    1. Tip: See Proxy.org for an updated, respected list of proxy servers that you can choose from. There are also several websites that offer free proxy server list downloads.
    2. Note: Most computers do not have proxy settings at all, so if yours are empty, don't worry, just skip this step.
 
  1. Change your DNS servers. It's possible that the 504 Gateway Timeout error you're seeing is caused by an issue with the DNS servers you happen to be using.
    1. Note: Unless you've previously changed them, the DNS servers you have configured right now are probably the ones automatically assigned by your ISP. Fortunately, a number of other DNS servers are available for your use that you can choose from. See our Free & Public DNS Servers list for your options.
    2. Tip: If not all your network devices are getting an HTTP 504 error but they're all on the same network, changing your DNS servers probably isn't going to work. If this sounds like your situation, move on to the next idea.
  2. If nothing has worked up to this point, contacting the website is probably the next best thing to do. There's a good chance the website administrators are already working to fix the root cause of the 504 Gateway Timeout error, assuming they're aware of it, but there's nothing wrong touching base with them.
    1. See our Website Contact Information page for help figuring out how to contact popular websites. Most major sites have social networking accounts they use to help support their services and some even have telephone numbers and email addresses.
    2. Tip: If it's starting to look like the website might be giving a 504 error for everyone, searching Twitter for real-time information about the site's outage is often helpful. The best way to do this is to search for #websitedown on Twitter. For example, if Facebook might be down, search #facebookdown.
 
  1. Contact your Internet Service Provider. It's very likely at this point, after following all the troubleshooting above, that the 504 Gateway Timeout that you're seeing is a problem caused by a network issue that your ISP is responsible for.
    1. Tip: See How to Talk to Tech Support for tips on talking to your Internet Service Provider about this problem.
  2. Come back later. You've exhausted all your options at this point and the 504 Gateway Timeout error is either in the hands of the website or your ISP to correct.
    1. Check back with the site regularly. No doubt it'll start working again soon.

https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/504

The HyperText Transfer Protocol (HTTP) 504 Gateway Timeout server error response code indicates that the server, while acting as a gateway or proxy, cannot get a response in time.

https://developer.mozilla.org/en-US/docs/Web/HTTP/Status/502

The HyperText Transfer Protocol (HTTP) 502 Bad Gateway server error response code indicates that the server, while acting as a gateway or proxy, received an invalid response from the upstream server.

504 Gateway Timeout Error 502 Bad Gateway的更多相关文章

  1. 解决 504 Gateway Time-out和502 Bad Gateway(nginx)

    504 Gateway Time-out 问题所在: 所请求的网关没有请求到,简单来说就是没有请求到可以执行的PHP-CGI. 一般看来, 这种情况可能是由于nginx默认的fastcgi进程响应的缓 ...

  2. 504 Gateway Time-out 和 502 Bad Gateway相关处理

    若报:504 Gateway Time-out则与nginx有关 解决方案: #vim nginx.conf 添加以下代码: http{ fastcgi_connect_timeout 300; fa ...

  3. Nginx 502/504 Gateway time-out错误完美解决方案【转发】

      在安装完Nginx+PHP-fpm+Mysql后,跑PHP的应用会经常出现504 Gateway Time-out 或者502 Bad Gateway的情况. Nginx 504 Gateway ...

  4. nginx出现504 Gateway Time-out的解决思路

    http://www.xbc.me/nginx-fix-504-gateway-timeout/ 在安装完Nginx+PHP-fpm+Mysql后 (如何安装LNMP环境,请参考快速配置LNMP环境N ...

  5. 解决 502、504 Gateway Time-out(nginx)

    一.504 Gateway Time-out问题常见于使用nginx作为web server的服务器的网站 我遇到这个问题是在升级discuz论坛的时候遇到的 一般看来, 这种情况可能是由于nginx ...

  6. Nginx + php-fpm 执行 PHP 脚本超时 报错 502 Bad Gateway + 504 Gateway Time-out 的解决办法

    上周写好的发送邮件的计划任务只发送了一部分,检查计划任务日志,发现 502 Bad Gateway 的错误(已经在脚本中设置了 set_time_limit(0)). 后来在网上查找资料,可以通过以下 ...

  7. 记一次接口504 Gateway Time-out原因及解决方法

    今天在刷新公司项目页面时发现有个板块一直刷新不出数据,最后发现接口报错(504 Gateway Time-out) 通过查看代码发现有个sql语句,如下,特别慢 select `vdc1`,      ...

  8. Nginx报504 gateway timeout错误的解决方法

    转载文章来源:http://www.111cn.net/sys/nginx/90669.htm(若侵删) Nginx报504 gateway timeout错误引起,一个是文件配置问题,另一个是相关处 ...

  9. WDCP LNMPA和LNMP 504 Gateway time-out错误的解决方法

    Nginx的特点是处理静态很给力,Apache的特点是处理动态很稳定,两者结合起来便是LNMPA,nginx处理前端,apache处理后端,这样处理静态会很快,处理动态会很稳定.当我以为安装完成以后便 ...

随机推荐

  1. 在Linux 双机下自己手动实现浮动ip技术

    两台Linux服务器,一台为主机(IP:124.158.26.30)对外提供了一定的网络服务,另一台从机(IP:124.158.26.31)能提供相同的服务,但ip地址没有对外部公开客户端连接的都是1 ...

  2. c# datetime是一年中的第几周

    public static int WeekOfYear(DateTime dt, CultureInfo ci) { return ci.Calendar.GetWeekOfYear(dt, ci. ...

  3. OBS插件开发以及OBS插件的选择(obs直播插件)研究思路

    obs版本的选择: 工作室版,优化了很多东西,缺点是不能用插件,在部分机型不稳定,因为更新的很频繁.不过这个插件不能用的说法还是停留在早起,截至到今天已经完美支持,所以在不久的将来会越来越好,如果是开 ...

  4. js 日期计算星座 根据生日的月份和日期,一行代码计算星座的js小函数(转)

    本博客根据 开源中国作者清风徐不来 的文章 根据生日的月份和日期,一行代码计算星座的js小函数(转) 原文出自CSDN 无心的专栏 的文章,知识产权归原文作者所有! 点击查看原文:js 日期计算星座

  5. 转: JDK包含的基本组件

    JDK(Java Development Kit)是Sun Microsystems针对Java开发员的产品.自从Java推出以来,JDK已经成为使用最广泛的Java SDK.JDK 是整个Java的 ...

  6. JDK5新特性之线程同步工具类(三)

    一. Semaphore Semaphore能够控制同一时候訪问资源的线程个数, 比如: 实现一个文件同意的并发訪问数. Semaphore实现的功能就类似厕全部5个坑, 增加有十个人要上厕所, 那么 ...

  7. vim  模式查找

    1. / 正向查找, ?反向查找 2. \v 激活very magic搜索模式,撰写正则表达式更接近于perl的正则表达式,大多数字符不需要进行转义 3. \V 激活noVeryMagic模式,按字符 ...

  8. Android 开发资源

    0x00 Android 入门资料 a. Android 学习之路 b.<第一行代码> 介绍及购买链接:http://blog.csdn.net/guolin_blog/article/d ...

  9. HTML5 手机网页制作笔记

    http://top.css88.com/archives/546 http://www.w3cfuns.com/blog-5470280-5406828.html 最近在卓手机网页,第一次入手.把要 ...

  10. URL Handle in Swift (一) -- URL 分解

    更新时间: 2018-6-6 在程序开发过程之中, 我们总是希望模块化处理某一类相似的事情. 在 ezbuy 开发中, 我接触到了对于 URL 处理的优秀的代码, 学习.改进.记录下来.希望对你有所帮 ...