为何NGINX 报502错 -PHP Tutorial-php.cn

Home

Backend Development

PHP Tutorial

为何NGINX 报502错

WBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWBOYWB

Jun 13, 2016 pm 12:50 PM

gatewaynbsp

为啥NGINX 报502错
最近修改公司的一个网站，添加一个页面。在线下测试的时候OK，但是到了线上就显示502 Bad Gateway。

我把代码重新优化了一下，在线下的时候页面加载速度很快，但是到了线上加载速度慢，超时了。然后就报错

------解决方案--------------------
关于502 bad gateway报错的解决办法
　　通俗解释一下
　　1.什么是502 bad gateway 报错
　　简单来说 502 是报错类型代码 bad gateway 错误的网关
　　2.产生错误的原因
　　连接超时我们向服务器发送请求由于服务器当前链接太多，导致服务器方面无法给于正常的响应,产生此类报错
　　3.解救的办法
　　最好的解决办法当然还是在服务器上做对大家来说不太可能
　　那么我们有什么解救的方法呢？
　　说白了很简单
　　就是――刷新(不是一般的刷新哦)
　　刷新的原理：很多人可能不知道刷新也是有两种的。
　　所谓刷新其实就是从服务器下载数据到本地的硬盘浏览器,
　　再从本地硬盘中读取数据到浏览器显示给我们看。
　　①基本刷新：就是点击刷新或者使用F5快捷键
　　基本刷新只是从本地的硬盘重新拿取数据到浏览器，并不重新向服务器发出请求。
　　大部分用户很多时候都是这样刷新的，遇到502报错的就没有任何效果。
　　②从服务器刷新：如果你重新直接点击你想要浏览的网页链接，你会发现刚才还是显示502 bad getway的页面现在又可以正常浏览了！
　　明白道理了吧？当你点击你想要浏览的网页链接的时候，是会从服务器重新下载数据的。
　　解决方法就是从服务器上刷新：快捷键 ctrl+F5，这样就是重新向服务器发送请求了。
　　如果服务器能正常给予你响应你就可以看到页面了。

Statement

The content of this article is voluntarily contributed by netizens, and the copyright belongs to the original author. This site does not assume corresponding legal responsibility. If you find any content suspected of plagiarism or infringement, please contact admin@php.cn

The Continued Use of PHP: Reasons for Its EnduranceApr 19, 2025 am 12:23 AM

What’s still popular is the ease of use, flexibility and a strong ecosystem. 1) Ease of use and simple syntax make it the first choice for beginners. 2) Closely integrated with web development, excellent interaction with HTTP requests and database. 3) The huge ecosystem provides a wealth of tools and libraries. 4) Active community and open source nature adapts them to new needs and technology trends.

PHP and Python: Exploring Their Similarities and DifferencesApr 19, 2025 am 12:21 AM

PHP and Python are both high-level programming languages that are widely used in web development, data processing and automation tasks. 1.PHP is often used to build dynamic websites and content management systems, while Python is often used to build web frameworks and data science. 2.PHP uses echo to output content, Python uses print. 3. Both support object-oriented programming, but the syntax and keywords are different. 4. PHP supports weak type conversion, while Python is more stringent. 5. PHP performance optimization includes using OPcache and asynchronous programming, while Python uses cProfile and asynchronous programming.

PHP and Python: Different Paradigms ExplainedApr 18, 2025 am 12:26 AM

PHP is mainly procedural programming, but also supports object-oriented programming (OOP); Python supports a variety of paradigms, including OOP, functional and procedural programming. PHP is suitable for web development, and Python is suitable for a variety of applications such as data analysis and machine learning.

PHP and Python: A Deep Dive into Their HistoryApr 18, 2025 am 12:25 AM

PHP originated in 1994 and was developed by RasmusLerdorf. It was originally used to track website visitors and gradually evolved into a server-side scripting language and was widely used in web development. Python was developed by Guidovan Rossum in the late 1980s and was first released in 1991. It emphasizes code readability and simplicity, and is suitable for scientific computing, data analysis and other fields.

Choosing Between PHP and Python: A GuideApr 18, 2025 am 12:24 AM

PHP is suitable for web development and rapid prototyping, and Python is suitable for data science and machine learning. 1.PHP is used for dynamic web development, with simple syntax and suitable for rapid development. 2. Python has concise syntax, is suitable for multiple fields, and has a strong library ecosystem.

PHP and Frameworks: Modernizing the LanguageApr 18, 2025 am 12:14 AM

PHP remains important in the modernization process because it supports a large number of websites and applications and adapts to development needs through frameworks. 1.PHP7 improves performance and introduces new features. 2. Modern frameworks such as Laravel, Symfony and CodeIgniter simplify development and improve code quality. 3. Performance optimization and best practices further improve application efficiency.

PHP's Impact: Web Development and BeyondApr 18, 2025 am 12:10 AM

PHPhassignificantlyimpactedwebdevelopmentandextendsbeyondit.1)ItpowersmajorplatformslikeWordPressandexcelsindatabaseinteractions.2)PHP'sadaptabilityallowsittoscaleforlargeapplicationsusingframeworkslikeLaravel.3)Beyondweb,PHPisusedincommand-linescrip

How does PHP type hinting work, including scalar types, return types, union types, and nullable types?Apr 17, 2025 am 12:25 AM

PHP type prompts to improve code quality and readability. 1) Scalar type tips: Since PHP7.0, basic data types are allowed to be specified in function parameters, such as int, float, etc. 2) Return type prompt: Ensure the consistency of the function return value type. 3) Union type prompt: Since PHP8.0, multiple types are allowed to be specified in function parameters or return values. 4) Nullable type prompt: Allows to include null values and handle functions that may return null values.

See all articles