{"id":7993,"date":"2025-05-07T10:00:41","date_gmt":"2025-05-07T04:30:41","guid":{"rendered":"https:\/\/www.notiontechnologies.com\/blog\/?p=7993"},"modified":"2025-06-19T14:44:27","modified_gmt":"2025-06-19T09:14:27","slug":"what-are-4xx-http-status-codes","status":"publish","type":"post","link":"https:\/\/www.notiontechnologies.com\/blog\/what-are-4xx-http-status-codes\/","title":{"rendered":"What Are 4xx HTTP Status Codes?"},"content":{"rendered":"\n

Introduction to 4xx HTTP Status Codes<\/strong> – When you visit a website, your browser sends a request to the server. The server responds with an HTTP status code<\/strong>. These codes tell if the request was successful or if there was an error.<\/p>\n\n\n\n

4xx HTTP status codes<\/strong> are client-side errors<\/strong>. This means the problem is usually on the user\u2019s side. It could be a wrong URL, missing page, or permission issue.<\/p>\n\n\n\n

Understanding these codes helps users and developers fix problems quickly. Below, we explain the most common 4xx status codes<\/strong> and how to resolve them.<\/p>\n\n\n\n

Common 4xx HTTP Status Codes<\/h2>\n\n\n\n

1. 400 Bad Request<\/h3>\n\n\n\n

The 400 Bad Request<\/strong> error means the server couldn\u2019t understand the request. This happens when:<\/p>\n\n\n\n

    \n
  • The request has incorrect syntax.<\/li>\n\n\n\n
  • The URL is malformed.<\/li>\n\n\n\n
  • There\u2019s corrupted data in the request.<\/li>\n<\/ul>\n\n\n\n

    How to fix it:<\/strong><\/p>\n\n\n\n

      \n
    • Check the URL for typos.<\/li>\n\n\n\n
    • Clear browser cache and cookies.<\/li>\n\n\n\n
    • Contact the website admin if the issue persists.<\/li>\n<\/ul>\n\n\n\n

      2. 401 Unauthorized<\/h3>\n\n\n\n

      The 401 Unauthorized<\/strong> error means you need authentication to access the page. Even if you log in with wrong credentials, you may see this error.<\/p>\n\n\n\n

      How to fix it:<\/strong><\/p>\n\n\n\n

        \n
      • Enter the correct username and password.<\/li>\n\n\n\n
      • Check if you have permission to access the resource.<\/li>\n\n\n\n
      • Refresh the page or re-login.<\/li>\n<\/ul>\n\n\n\n

        3. 403 Forbidden<\/h3>\n\n\n\n

        The 403 Forbidden<\/strong> error means the server refuses to fulfill the request. Unlike 401<\/strong>, authentication won\u2019t help here. The server is blocking access.<\/p>\n\n\n\n

        Possible reasons:<\/strong><\/p>\n\n\n\n

          \n
        • No permission to view the file.<\/li>\n\n\n\n
        • The website has restricted access.<\/li>\n<\/ul>\n\n\n\n

          How to fix it:<\/strong><\/p>\n\n\n\n

            \n
          • Check file permissions (for website owners).<\/li>\n\n\n\n
          • Contact support if you believe access should be granted.<\/li>\n<\/ul>\n\n\n\n

            4. 404 Not Found<\/h3>\n\n\n\n

            The 404 Not Found<\/strong> error is the most common 4xx status code<\/strong>. It means the server can\u2019t find the requested page.<\/p>\n\n\n\n

            Why it happens:<\/strong><\/p>\n\n\n\n

              \n
            • The page was deleted or moved.<\/li>\n\n\n\n
            • The URL is mistyped.<\/li>\n<\/ul>\n\n\n\n

              How to fix it:<\/strong><\/p>\n\n\n\n

                \n
              • Double-check the URL spelling.<\/li>\n\n\n\n
              • Use the website\u2019s search bar to find the page.<\/li>\n\n\n\n
              • If you\u2019re a website owner, set up 301 redirects<\/strong> for deleted pages.<\/li>\n<\/ul>\n\n\n\n
                \n\n\n\n

                Other Important 4xx Status Codes<\/h2>\n\n\n\n

                5. 405 Method Not Allowed<\/h3>\n\n\n\n

                This error occurs when the server knows the request method (like GET or POST) but doesn\u2019t allow it for that URL.<\/p>\n\n\n\n

                How to fix it:<\/strong><\/p>\n\n\n\n

                  \n
                • Use the correct HTTP method.<\/li>\n\n\n\n
                • Check server configuration if you\u2019re a developer.<\/li>\n<\/ul>\n\n\n\n

                  6. 408 Request Timeout<\/h3>\n\n\n\n

                  The 408 Request Timeout<\/strong> means the server didn\u2019t receive a complete request in time.<\/p>\n\n\n\n

                  How to fix it:<\/strong><\/p>\n\n\n\n

                    \n
                  • Refresh the page.<\/li>\n\n\n\n
                  • Check your internet connection.<\/li>\n\n\n\n
                  • Reduce server load if you\u2019re hosting the website.<\/li>\n<\/ul>\n\n\n\n

                    7. 429 Too Many Requests<\/h3>\n\n\n\n

                    This error appears when a user sends too many requests in a short time. Websites use this to prevent abuse.<\/p>\n\n\n\n

                    How to fix it:<\/strong><\/p>\n\n\n\n

                      \n
                    • Wait and try again later.<\/li>\n\n\n\n
                    • If you\u2019re a developer, optimize API calls.<\/li>\n<\/ul>\n\n\n\n
                      \n\n\n\n

                      How to Troubleshoot 4xx Errors<\/h2>\n\n\n\n

                      Since 4xx errors<\/strong> are client-side, users can often fix them. Here\u2019s a quick guide:<\/p>\n\n\n\n

                        \n
                      1. Check the URL<\/strong> \u2013 A small typo can cause a 404 error<\/strong>.<\/li>\n\n\n\n
                      2. Clear browser cache<\/strong> \u2013 Corrupted cache may trigger 400 or 403 errors<\/strong>.<\/li>\n\n\n\n
                      3. Log in again<\/strong> \u2013 Fixes 401 Unauthorized<\/strong> issues.<\/li>\n\n\n\n
                      4. Contact support<\/strong> \u2013 If the error persists, the website may have a problem.<\/li>\n<\/ol>\n\n\n\n

                        For website owners<\/strong>, use tools like Google Search Console<\/strong> to monitor 4xx errors<\/strong>. Fixing them improves SEO and user experience.<\/p>\n\n\n\n

                        \n\n\n\n

                        Conclusion<\/h2>\n\n\n\n

                        4xx HTTP status codes<\/strong> indicate client-side errors. The most common ones are 400, 401, 403, and 404<\/strong>. Understanding these codes helps users and developers resolve issues faster.<\/p>\n\n\n\n

                        If you see a 4xx error<\/strong>, check the URL, refresh the page, or clear your cache. Website owners should fix broken links to improve site health.<\/p>\n\n\n\n

                        By learning about HTTP status codes<\/strong>, you can navigate the web more efficiently and troubleshoot errors like a pro!<\/p>\n\n\n\n

                        This guide covers the basics of 4xx HTTP status codes<\/strong> in simple terms. If you have questions, feel free to research further or ask an expert!<\/p>\n","protected":false},"excerpt":{"rendered":"

                        Introduction to 4xx HTTP Status Codes – When you visit a website, your browser sends a request to the server. The server responds with an HTTP status code. These codes…<\/p>\n","protected":false},"author":7,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[49],"tags":[],"class_list":["post-7993","post","type-post","status-publish","format-standard","hentry","category-resources"],"yoast_head":"\nWhat Are 4xx HTTP Status Codes?<\/title>\n<meta name=\"description\" content=\"Learn what 4xx HTTP status codes mean, their types, and how to fix them. 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