当您访问的网站缺少检索或显示您的网络浏览器请求的信息的功能时，会出现“501 未实施”错误。501 错误是您的浏览器可能显示的几个HTTP状态代码之一。(HTTP)
您的浏览器将显示服务器错误响应（或HTTP状态代码），数字范围为 500–599。这些错误代码有不同的手段和不同的解决方案。本文将向您展示如何在多个设备和操作系统上修复“501 Not Implemented”错误。
501 未实施：这是什么意思(Mean)？
当您访问一个网站时，您的浏览器会向该网站的服务器发送一个请求。如果一切顺利，网站会提供所请求的数据。该响应可以是文本、图像、文件等。如果网络服务器出现问题并且无法处理您的请求，您的浏览器将显示“501 Not Implemented”错误。
这个错误意味着服务器缺乏满足或“实现”浏览器请求的功能。更准确地说，服务器无法识别浏览器使用的HTTP 请求方法。(HTTP request method)
大多数情况下，501 错误是由网站服务器的问题引起的。但是，在极少数情况下，您的网络浏览器和网络设置问题也可能触发错误。无论是什么原因，下面列出的故障排除技巧都可以解决问题。
1.重新加载或刷新页面
“501 Not Implemented”错误有时是暂时的，可能是由于服务器过载或流量激增。如果站点管理员快速修复问题，重新加载网页可能会解决错误。按键盘上的F5或Ctrl + R（Mac上为Command + R）刷新受影响的网页。尽可能多地这样做。如果多次刷新页面后错误仍然存在，请继续执行下一个故障排除解决方案。
2.查看网站服务器状态(Server Status)
站点监控工具（如DownDetector或IsItDownRightNow）为网站和在线服务提供服务器中断的实时报告。使用上述工具在显示“501 错误”的网站上执行服务器状态检查。
如果这些工具报告服务器停机或中断，您需要等待网站重新上线。如果错误在数小时或数天后仍然存在，请联系网站管理员。
3.尝试不同的浏览器
在不同的浏览器中访问网站可以帮助确定问题是否源于您的浏览器、设备或网站的服务器。
如果其他 Web 浏览器正确加载该网站，则排除了服务器端错误的可能性。在这种情况下，清除浏览器的缓存可能会解决问题。
4.清除浏览器缓存
缓存的网络数据(Cached web data)应该可以帮助您的浏览器更快地加载网页。但是，如果您的浏览器缓存数据损坏或过时，您的浏览器可能会遇到加载网页的问题。
如果 501 错误响应代码特定于特定浏览器，请清除浏览器的缓存并重新加载网页。按照以下步骤清除(clear cached web data)Chrome、Firefox、Safari和Microsoft Edge中缓存的 Web 数据。
清除 Google Chrome 中的浏览器缓存(Clear Browser Cache in Google Chrome)
- 打开 Chrome，将chrome://settings/clearBrowserData粘贴到地址栏中，然后按Enter / Return。
- 前往“高级”选项卡，将“时间(Time)范围”设置为所有时间(All time)，检查缓存图像和文件(Cached images and files)，然后选择清除数据(Clear data)。
清除 Microsoft Edge 中的浏览器缓存(Clear Browser Cache in Microsoft Edge)
打开一个新的浏览器选项卡，在地址栏中粘贴edge://settings/clearBrowserData ，然后按键盘上的Enter或Return 。检查缓存的图像和文件(Cached images and files)并选择立即清除(Clear now)。
在 Mozilla Firefox 中清除浏览器缓存(Clear Browser Cache in Mozilla Firefox)
打开一个新的浏览器选项卡，在地址栏中粘贴about:preferences#privacy ，然后按键盘上的Enter / Return 。在“ Cookies and Site Data”部分中选择清除数据，选中(Clear Data)缓存的 Web 内容(Cached Web Content)并选择清除(Clear)。
在 Safari 中清除浏览器缓存(Clear Browser Cache in Safari)
打开 Safari，在菜单栏上选择Safari ，然后选择(Safari)Preferences。前往“隐私(Privacy)”选项卡，选择“管理网站数据(Manage Website Data)”，选择“全部删除”(Remove All)，然后在确认信息中选择“删除”。(Remove)
5.禁用代理服务器
您计算机的代理设置(computer’s proxy settings)会影响您的网络浏览器加载某些网站的方式。如果您通过代理服务器上网(surfing the web via a proxy server)，请（暂时）禁用它并检查是否会停止 501 错误代码。
默认情况下，许多 Web 浏览器使用您计算机的代理设置。因此，除非您在浏览器中设置手动/自定义代理配置，否则在系统级别禁用代理应该可以解决问题。
在 Windows 中，转到设置(Settings)>网络和互联网(Network & internet)>代理(Proxy)以及页面上的任何手动或自动代理设置。
要在 macOS 中禁用代理设置，请前往System Preferences > Network > Advanced > Proxies，然后取消选中所有代理或HTTP协议。选择确定(OK)以保存更改并在浏览器中重新加载网站。
在 Chromebook 上，转到设置(Settings)>网络(Network)> Wi-Fi或以太网(Ethernet)，然后选择活动网络。然后(Afterward)，展开代理(Proxy)下拉菜单，并将“连接(Connection)类型”设置为直接互联网连接(Direct internet connection)。
6. 执行病毒扫描
您计算机上的恶意软件(Malware)感染会影响您的计算机和网站服务器之间的信息交换。在执行恶意软件扫描之前，请尝试访问另一台计算机上的网页。如果其他设备加载该网页，则您计算机上的 501 错误可能是由于恶意软件感染所致。
如果您使用的是 Windows PC，请打开Windows Defender（或 Windows 安全中心）(Windows Defender (or Windows Security))并对所有文件和正在运行的程序运行全面扫描。在运行恶意软件扫描时让浏览器保持打开状态。您还可以使用第三方应用程序来诊断安全威胁并修复 Windows 中的恶意软件感染(fix malware infections in Windows)。
对于非 Windows 用户，请查看一些适用于 Mac 的防病毒选项、适用(antivirus options for Mac)于 Linux 的免费防病毒程序(antivirus programs for Linux)以及适用于 Chromebook 的防恶意软件解决方案(antimalware solutions for Chromebook)。
网站(Website)管理员的故障排除提示(Tips)
过期的服务器软件或订阅可能会使您的站点访问者进入HTTP 501错误页面，服务器设置中的NGINX 配置不正确也会如此。(NGINX configuration)如果您拥有或管理显示 501 错误的网站，请确保已支付您的托管费用。此外，请确保您的 Web 应用程序是最新的。
未能及时修复此错误可能会对您网站的SEO排名产生负面影响。如果您没有解决后端服务器相关问题的技术知识，请联系您的托管服务提供商寻求帮助。
What Is a 501 Not Implemented Error (and How to Fix It)
Α “501 Not Implemented” error occurs when a website you visit lackѕ the functionality to retrieve or show information that your web browsеr has requested. A 501 error is one of severаl HTTP status codes your browser might display.
Your browser will display server error responses (or HTTP status codes) with numbers ranging from 500–599. These error codes have different means and different solutions. This article will show you how to fix the “501 Not Implemented” error on several devices and operating systems.
501 Not Implemented: What Does It Mean?
When you visit a website, your browser sends a request to the site’s server. If everything goes right, the website supplies the requested data. This response could be text, images, files, and so on. If there’s a problem with the web server and it fails to handle your request, your browser will display the “501 Not Implemented” error.
What this error means is that the server lacks the functionality to fulfill or “implement” your browser’s request. Even more precisely, the server fails to recognize the HTTP request method used by the browser.
Most of the time, a 501 error is caused by a problem with the website’s server. However, on rare occasions, problems with your web browser and network settings could also trigger the error. Whatever the cause, the troubleshooting tricks listed below could fix the issue.
1. Reload or Refresh the Page
The “501 Not Implemented” error is sometimes temporary, perhaps due to server overload or traffic surge. If the site administrator fixes the problem quickly, reloading the webpage may resolve the error. Press F5 or Ctrl + R (Command + R on Mac) on your keyboard to refresh the affected webpage. Do that as many times as you can. Proceed to the next troubleshooting solution if the error persists after refreshing the page multiple times.
2. Check the Website’s Server Status
Site monitoring tools (like DownDetector or IsItDownRightNow) provide real-time reports of server outages for websites and online services. Perform a server status check on the website displaying the “501 error” using the tools mentioned above.
If the tools report a server downtime or outage, you’ll need to wait for the website to come back online. Contact the website administrator if the error persists after several hours or days.
3. Try a Different Browser
Visiting the website in a different browser can help determine if the problem stems from your browser, device, or the website’s servers.
If other web browsers load the website properly, that rules out the possibility of a server-side error. In that case, clearing your browser’s cache might resolve the problem.
4. Clear Your Browser Cache
Cached web data is supposed to help your browser load web pages faster. However, your browser may encounter issues loading web pages if its cache data becomes corrupt or outdated.
If the 501 error response code is specific to a particular browser, clear the browser’s cache and reload the webpage. Follow the steps below to clear cached web data in Chrome, Firefox, Safari, and Microsoft Edge.
Clear Browser Cache in Google Chrome
- Open Chrome, paste chrome://settings/clearBrowserData in the address bar, and press Enter/Return.
- Head to the “Advanced” tab, set the “Time range” to All time, check Cached images and files, and select Clear data.
Clear Browser Cache in Microsoft Edge
Open a new browser tab, paste edge://settings/clearBrowserData in the address bar, and press Enter or Return on the keyboard. Check Cached images and files and select Clear now.
Clear Browser Cache in Mozilla Firefox
Open a new browser tab, paste about:preferences#privacy in the address bar, and press Enter/Return on the keyboard. Select Clear Data in the “Cookies and Site Data” section, check Cached Web Content and select Clear.
Clear Browser Cache in Safari
Open Safari, select Safari on the menu bar, and select Preferences. Head to the Privacy tab, select Manage Website Data, choose Remove All, and select Remove on the confirmation.
5. Disable Proxy Server
Your computer’s proxy settings affect how your web browser(s) load certain websites. If you’re surfing the web via a proxy server, disable it (temporarily) and check if that stops the 501 error code.
By default, many web browsers use your computer’s proxy settings. So, unless you set up a manual/custom proxy configuration in your browser, disabling proxy at the system level should do the trick.
In Windows, go to Settings > Network & internet > Proxy and any manual or automatic proxy setup on the page.
To disable proxy settings in macOS, head to System Preferences > Network > Advanced > Proxies, and uncheck all proxy or HTTP protocols. Select OK to save the changes and reload the website in your browser.
On a Chromebook, go to Settings > Network > Wi-Fi or Ethernet and select the active network. Afterward, expand the Proxy drop-down menu, and set the “Connection type” to Direct internet connection.
6. Perform a Virus Scan
Malware infection on your computer can affect information exchange between your computer and the website’s servers. Before performing a malware scan, try visiting the webpage on another computer. If other devices load the webpage, the 501 error on your computer could be due to malware infection.
If you’re using a Windows PC, open Windows Defender (or Windows Security) and run a full scan of all files and running programs. Leave your browser open while you run the malware scan. You can also use third-party apps to diagnose security threats and fix malware infections in Windows.
For non-Windows users, check out some antivirus options for Mac, free antivirus programs for Linux, and antimalware solutions for Chromebook.
Troubleshooting Tips For Website Administrators
Expired server software or subscription could land your site visitors on an HTTP 501 error page, as will incorrect NGINX configuration in your server settings. If you own or manage the website displaying the 501 error, ensure your hosting bills are paid. Additionally, make sure your web application is up-to-date.
Failure to fix this error in time could negatively impact your site’s SEO ranking. Contact your hosting provider for assistance if you have no technical knowledge of troubleshooting server-related issues on the backend.
