A comprehensive guide on HTTP Status Codes: All 63 explained

Have you ever encountered an error message while browsing the internet? It's frustrating, right? Well, those error messages are a result of HTTP status codes, a crucial part of the web browsing experience. Whether you're a website owner or just a curious internet user, understanding HTTP status codes can make a big difference in your online interactions.

Let's take a moment to dive into the world of HTTP status codes and explore their meanings. Imagine you're ordering a pizza online and eagerly waiting for it to arrive at your doorstep. Suddenly, you receive a notification saying, "Error 404 - Pizza not found." Your excitement fades, and confusion sets in. What does this error code mean?

Just like in the pizza scenario, HTTP status codes are messages from the web server to your browser, letting you know the outcome of your request. Whether it's a successful transaction (like receiving a mouthwatering pizza) or an error (like the unfortunate absence of pizza), these codes provide valuable information about the state of your interaction with a website.

In this comprehensive guide, we will explore all 63 HTTP status codes, dissect their meanings, and provide insights into how they impact your browsing experience. By the end, you'll be equipped with the knowledge to decipher any HTTP status code and understand the implications it has for you as a user or a website owner.

Key Takeaways:

• HTTP status codes are messages from the web server to your browser that indicate the outcome of your request.
• Understanding HTTP status codes is valuable for both website owners and internet users.
• There are 63 HTTP status codes, each with its own meaning and significance.
• HTTP status codes provide insights into the success or failure of a request, allowing you to troubleshoot any errors encountered.
• By familiarizing yourself with HTTP status codes, you can navigate the web more effectively and optimize your website's performance.

What Are HTTP Status Codes?

HTTP status codes are an essential part of the web browsing experience, providing information about the success or failure of a request made by your browser to a web server. When you visit a website or interact with online services, the server responds to your browser's requests with a specific status code. These codes help you and the server communicate effectively by indicating the outcome of each request.

HTTP status codes are generated by web servers and are included in the response headers sent back to your browser. They provide valuable information about various aspects of the request, such as whether it was successful, redirected, or encountered an error.

The main purpose of HTTP status codes is to inform your browser and any other software interacting with the server about the status of the requested resource. By understanding the status code, your browser knows how to handle the response and display the appropriate content to you. This ensures a smooth browsing experience and helps you troubleshoot any issues that may arise.

The 5 Tiers of HTTP Status Codes

HTTP status codes are categorized into five tiers based on their meaning and purpose. Each tier indicates a different type of response from the server to the browser. Understanding these tiers can help in troubleshooting issues and optimizing website performance.

1. Informational

Informational status codes, represented by 1xx, indicate that the server has received the request and is continuing with the process. These codes are used to provide additional information about the ongoing request or to acknowledgment it. Some examples of informational status codes include:

• 100 - Continue
• 101 - Switching Protocols

2. Successful

Successful status codes, represented by 2xx, indicate that the request was successfully received, understood, and processed by the server. These codes are used to indicate that the requested action has been successfully completed. Some examples of successful status codes include:

• 200 - OK
• 201 - Created

3. Redirection

Redirection status codes, represented by 3xx, indicate that the client needs to take additional action to complete the request. These codes are used when a resource has been moved, temporarily or permanently, to a different location. The client is then redirected to the new location. Some examples of redirection status codes include:

• 301 - Moved Permanently
• 302 - Found

4. Client Errors

Client error status codes, represented by 4xx, indicate that there was an error on the client's side of the request. These codes are used to denote issues such as invalid requests, unauthorized access, or missing resources. Some examples of client error status codes include:

• 400 - Bad Request
• 404 - Not Found

5. Server Errors

Server error status codes, represented by 5xx, indicate that there was an error on the server's side of the request. These codes are used to denote issues such as server overload, timeout, or internal server errors. Some examples of server error status codes include:

• 500 - Internal Server Error
• 503 - Service Unavailable

Table of 63 HTTP Status Codes

With 63 distinct HTTP Status Codes available, web developers and administrators have a robust framework to understand the outcome of requests sent from a browser to a web server. This guide offers a detailed overview of these codes, their meanings, and their categories, providing essential insights for effective website management.

Categories of HTTP Status Codes

• Informational HTTP Status Codes (1xx): These codes indicate that the request has been received and the process is continuing. They serve as preliminary responses before the actual data is provided.
• Successful HTTP Status Codes (2xx): This category confirms that the request was successfully received, understood, and accepted. The most familiar code in this category is 200 OK, which signals that everything is functioning as expected.
• Redirection HTTP Status Codes (3xx): Codes beginning with 3 inform the browser that further action needs to be taken to complete the request. This usually means the resource has moved to a new location or can be found elsewhere.
• Client Error HTTP Status Codes (4xx): These codes signify issues with the request that prevented the server from processing it. A common example is the 404 Not Found error, indicating that the server couldn't locate the requested resource.
• Server Error HTTP Status Codes (5xx): This group of HTTP Status Codes points to problems on the server's side, such as a 500 Internal Server Error or a 503 Service Unavailable error, highlighting issues that server administrators need to address.

Leveraging HTTP Status Codes for Troubleshooting and Optimization

This categorization of HTTP Status Codes serves as an indispensable tool for diagnosing and resolving website issues. By understanding the specific codes, web professionals can quickly pinpoint problems, from client-related errors to server-side issues, facilitating efficient troubleshooting and optimization of website performance.

The Different HTTP Status Codes Explained

In the world of web development and browsing, HTTP status codes play a crucial role in communication between servers and browsers. These codes are generated as responses from the server, indicating the success or failure of a request. Understanding the different categories of HTTP status codes and their meanings is essential for website owners and developers. In this section, we will explore each category individually, providing detailed explanations and examples for each status code.

100 Status Codes

Status codes in the 100 range are informational. They indicate that the server has received the request and is continuing to process it. These codes do not necessarily signify success or failure but serve as intermediate responses during the request-handling process. Examples include:

• 100 Continue: The server has received the initial part of the request and encourages the client to proceed with sending the remaining data.
• 101 Switching Protocols: The server acknowledges the client's request to switch protocols and is transitioning to the requested protocol.
• 102 Processing: The server has received and is processing the request, but the processing is not yet complete.
• 103 Early Hints: Provides some response headers before the final HTTP message, primarily for optimization purposes.

200 Status Codes

Status codes in the 200 range indicate a successful request. These codes inform the client that the request has been accepted and processed correctly. Examples include:

• 200 OK: The request has succeeded, and the requested resource is returned in the response.
• 201 Created: The request has been fulfilled, and a new resource has been created as a result.
• 202 Accepted: The request was accepted but is still in progress. It’s used for cases where another server handles the request or for batch processing.
• 203 Non-Authoritative Information: The data returned isn’t from the origin server. Instead, it’s a modified version collected from a third party.
• 204 No Content: The request was successfully processed, but there is no content. The headers may be useful.
• 205 Reset Content: The server fulfilled the request but asked the user to reset the document.
• 206 Partial Content: The server is delivering part of the resource. This response is used when the client sends a Range header to request only part of a resource.
• 207 Multi-Status: Provides the statuses of multiple resources, depending on how many sub-requests were made.
• 208 Already Reported: The members of a DAV:propstat element have already been listed and won’t be included again.
• 226 IM used: The server completed a GET request. And the response indicates one or more instance-manipulation results.

300 Status Codes

Status codes in the 300 range indicate redirection. These codes are used when the requested resource is available at a different URL. Examples include:

• 300 Multiple Choice: The request has more than one possible response. And the user should choose one of them.
• 301 Moved Permanently: This redirect status code indicates the requested resource has permanently moved to a new URL. The browser displays the new URL.
• 302 Found: Previously known as “Moved Temporarily,” this code indicates the requested resource has temporarily moved to a new URL.
• 303 See Other: The server redirects the user to the requested resource with a GET request at another URL.
• 304 Not Modified: Used for caching purposes. The response hasn’t been modified, so the client can continue to use the same cached version of the requested resource.
• 305 Use Proxy: The requested resource is only available through a proxy, the address for which is provided in the response. Clients are expected to repeat the request via the proxy.
• 306 Switch proxy: This status code is no longer used and is reserved for future use. It was originally intended to indicate that subsequent requests should use a new set of URIs for the resource.
• 307 Temporary Redirect: The requested resource temporarily moved to a different URL. The only difference vis-a-vis the 302 code is the user must not change the HTTP method used.
• 308 Permanent Redirect: The requested resource permanently moved to a different URL. The difference between this code and 301 is the user must not change the HTTP request method.

400 Status Codes

Status codes in the 400 range indicate client errors. These codes are generated when the server cannot fulfill the client's request due to invalid or malformed syntax or authorization issues. Examples include:

• 400 Bad Request: The server cannot understand the request due to invalid syntax.
• 401 Unauthorized: The user doesn’t have valid authentication credentials to get the requested resource.
• 402 Payment Required: Reserved for future use; it was initially intended for digital payment systems. It’s very rarely used, and no standard convention regulates it.
• 403 Forbidden: The client doesn’t have access rights to the content. For example, it may require a password. Unlike the 401 HTTP error code, the server does know the client’s identity.
• 404 Not Found: The server can’t find the requested resource, and no redirection has been set.404 errors can harm your SEO efforts.
• 405 Method Not Allowed: The server supports the request method, but the target resource doesn’t.
• 406 Not Acceptable: The server doesn’t find any content that satisfies the criteria given by the user according to the Accept headers requested.
• 407 Proxy Authentication Required: This is similar to a 401, but a proxy must authenticate the client to continue.
• 408 Request Timeout: The server timed out waiting because the client didn’t produce a request within the allotted time.
• 409 Conflict: The server can’t fulfill the request because there’s a conflict with the resource. It’ll display information about the problem so the client can fix it and resubmit.
• 410 Gone: The content requested has been permanently deleted from the server and will not be reinstated.
• 411 Length Required: The server rejects the request because it requires a defined Content-Length header field.
• 412 Precondition Failed: The client indicates preconditions in the header fields that the server fails to meet.
• 413 Payload Too Large: The client’s request is larger than the server’s defined limits, and the server refuses to process it.
• 414 URI Too Long: The URI (Uniform Resource Identifier) requested by the client is too long for the server to process.
• 415 Unsupported Media Type: The request uses a media format the server does not support.
• 416 Range Not Satisfiable: The server can’t fulfill the value indicated in the request’s Range header field.
• 417 Expectation Failed: The server can’t meet the requirements indicated by the Expect request header field.
• 418 I'm a Teapot: The server refuses the attempt to brew coffee with a teapot, indicating that it is a teapot, not a coffee machine. This code is part of an April Fools' joke from the Hyper Text Coffee Pot Control Protocol.
• 421 Misdirected Request: The client sends a request to a server that can’t produce a response.
• 422 Unprocessable Entity: The client correctly sends the request, but the server can’t process it because of semantic errors or similar issues.
• 423 Locked: The requested method’s resource is locked and inaccessible.
• 424 Failed Dependency: The request failed because a request the initial request depended on also failed.
• 425 Too Early: The server is unwilling to process a request that might be replayed.
• 426 Update Required: The server refuses to process the request using the current protocol unless the client upgrades to a different protocol.
• 428 Precondition Required: The server needs the request to be conditional.
• 429 Too Many Requests: The user sends too many requests in a certain amount of time.
• 431 Request Header Fields Too Large: The server can’t process the request because the header fields are too large.
• 451 Unavailable for Legal Reasons: The user requests a resource the server can’t legally provide.

500 Status Codes

Status codes in the 500 range indicate server errors. These codes are generated when the server encounters an error while attempting to fulfill the request. Examples include:

• 500 Internal Server Error: An unexpected error has occurred on the server, and it cannot fulfill the request.
• 501 Not Implemented: The server can’t fulfill the request or doesn’t recognize the request method.
• 502 Bad Gateway: The server acts as a gateway and gets an invalid response from an inbound host.
• 503 Service Unavailable: The server is unable to process the request. This often occurs when a server is overloaded or down for maintenance.
• 504 Gateway Timeout: The server was acting as a gateway or proxy and timed out, waiting for a response.
• 505 HTTP Version Not Supported: The server doesn’t support the HTTP version in the request.
• 506 Variant Also Negotiates: The server has an internal configuration error.
• 507 Insufficient Storage: The server doesn’t have enough storage to process the request successfully.
• 508 Loop Detected: The server detects an infinite loop while processing the request.
• 510 Not Extended: The server requires further extensions to fulfill the request but does not specify what those extensions are. This status indicates that additional extensions to the request are needed for the server to serve it.
• 511 Network Authentication Required: The client must be authenticated to access the network. The error should include a link where the user can submit credentials.

Why HTTP Status Codes and Errors Matter for Search Engine Optimization (SEO)

When it comes to optimizing your website for search engines, understanding the importance of HTTP status codes and errors is crucial. These status codes provide valuable information to search engines about the status of your website and the content it serves. By effectively managing these codes, you can improve your website's search ranking and user experience.

200 OK & SEO Impact

The HTTP status code "200 OK" indicates a successful request and is the most common status code you want to see. It tells search engines that the page has been loaded correctly and can be indexed. A "200 OK" status code has a positive impact on your website's SEO, showing that your website is functioning properly and delivering the intended content.

301 Moved Permanently & SEO Impact

The HTTP status code "301 Moved Permanently" is used when you permanently redirect a webpage to a new location. This code tells search engines that the content has been permanently moved to a new URL. Redirecting pages using "301" status codes preserves the SEO value of the original page and ensures that search engines can still find and index the updated content.

302 Found & SEO Impact

The HTTP status code "302 Found" is used when you temporarily redirect a webpage. Unlike the "301" code, the "302" code indicates that the redirect is temporary. Search engines will continue to index the original URL instead of the redirected one. It's important to note that "302" redirects may not pass on the same SEO value as "301" redirects, so use them wisely.

404 Not Found & SEO Impact

The HTTP status code "404 Not Found" is one of the most common error codes encountered on the web. It occurs when a page cannot be found on the server. From an SEO perspective, having too many "404" errors can negatively impact your website's search ranking. It's important to fix these errors by redirecting or updating the URLs to ensure a smooth user experience and maintain SEO value.

410 Gone & SEO Impact

The HTTP status code "410 Gone" is similar to the "404" code, indicating that the requested page is no longer available on the server. However, unlike "404" errors, a "410 Gone" status code tells search engines that the page has been intentionally removed and will not be coming back. While it may seem similar to "404" errors, using "410" codes properly can help search engines recognize that the content is permanently gone.

5xx Server errors & SEO Impact

HTTP status codes starting with "5" indicate server errors, such as "500 Internal Server Error" or "503 Service Unavailable." These errors occur when something goes wrong on the server side, impacting the website's functionality. While these errors may not directly affect your SEO, they can result in poor user experience and hinder search engine crawling and indexing. It's important to promptly address and fix these server errors to prevent any negative impact on your website's performance.How to Check the HTTP Status Code of a Page

Checking the HTTP status code of a web page is essential for understanding the response returned by the server. It helps you diagnose potential issues and ensure a smooth browsing experience for your users. In this section, we will explain how to check the HTTP status code using two popular tools: Google Chrome and Google Search Console.

Checking for HTTP Status Codes on Google Chrome

1. Open Google Chrome and navigate to the web page you want to check.
2. Right-click anywhere on the page and select "Inspect" from the context menu.
3. A developer console will appear. Click on the "Network" tab.
4. Refresh the page by pressing F5 or clicking the reload button.
5. You will see a list of all the network requests made by the page. Look for the topmost request, which represents the main HTML document.
6. The HTTP status code will be displayed in the "Status" column. It could be 200 (OK), 404 (Not Found), or any other code depending on the server's response.

By checking the HTTP status code in Google Chrome, you can quickly identify if a page is loading successfully or encountering an error.

Checking for HTTP Status Codes in Google Search Console

1. Log in to your Google Search Console account.
2. Select your website property from the dashboard.
3. In the left-hand menu, click on "Coverage".
4. You will see a list of URLs from your website with corresponding status codes.
5. Scroll through the list to find the specific page you want to check.
6. The status code will be displayed in the "Status" column. It could be 200 (OK), 404 (Not Found), or any other code.

Using Google Search Console, you can easily monitor the status codes of your website's pages and take appropriate actions if necessary.

Table of HTTP Status Codes

The table above provides a general overview of some common HTTP status codes. It includes the status code, its meaning, and the category it belongs to. Use this table as a reference to understand the different status codes and their implications.

How to Fix 404 Errors?

If you've ever encountered a 404 error while browsing the web, you know how frustrating it can be. The 404 status code indicates that the requested webpage could not be found on the server. But fear not, there are ways to fix these errors and ensure a smooth browsing experience for your website visitors.

Here are some practical tips and best practices for resolving 404 errors:

1. Check the URL: The first step is to double-check the URL for any typos or incorrect formatting. Even a small mistake can lead to a 404 error. Make sure the URL is correct and matches the intended page.
2. Redirect the page: If you have moved or renamed a page on your website, it's essential to set up a redirection from the old URL to the new one. This will automatically redirect visitors to the correct page and prevent 404 errors.
3. Update internal links: If you have internal links pointing to a page that no longer exists, update those links to direct users to the correct page. This will help prevent 404 errors from occurring when visitors click on internal links.
4. Provide a helpful error page: When a 404 error does occur, it's essential to provide users with a helpful error page. Customize the error page with a clear message, navigation options, and a search bar to assist visitors in finding the information they were looking for.
5. Monitor and fix broken links: Regularly monitor your website for broken links. Use online tools or website crawling software to identify broken links and fix them promptly. This will help prevent 404 errors and improve the overall user experience.

By following these tips and best practices, you can effectively handle 404 errors and ensure that your website visitors have a seamless browsing experience.

How to Fix 503 Errors?

If you've encountered a 503 error, also known as "Service Unavailable," you may be wondering how to resolve it and restore uninterrupted access to your website. A 503 error occurs when the web server is temporarily unable to handle requests due to maintenance, overload, or other issues.

To fix a 503 error, follow these strategies:

1. Check server logs: Start by checking the server logs for any error messages or clues about the cause of the 503 error. This can help you identify any specific issues that need to be addressed.
2. Temporary server overload: If the 503 error is due to a temporary server overload, you can try scaling up your server resources, such as increasing CPU power, memory, or bandwidth. Consult with your web hosting provider or IT team for assistance.
3. Check for maintenance: If you're performing scheduled maintenance on your website, ensure that you've properly configured a maintenance page or set the server to return a 503 status code during the maintenance window.
4. Review plugins or extensions: In some cases, a faulty or incompatible plugin or extension can trigger a 503 error. Disable any recently installed or updated plugins/extensions and check if the error persists.
5. Restart web server: Restarting your web server can sometimes resolve temporary issues causing the 503 error. This can be done through your hosting control panel or by contacting your web hosting provider.
6. Contact your web hosting provider: If you've tried the above steps and the 503 error still persists, it's advisable to reach out to your web hosting provider for further assistance. They can help investigate the issue and provide guidance on how to resolve it.

By following these strategies, you can troubleshoot and fix 503 errors, ensuring that your website is accessible to visitors without interruptions.

Summary

In this article, we have provided a comprehensive guide on HTTP status codes and their significance for website owners and visitors. HTTP status codes are generated as responses from the server to the browser, indicating the success or failure of a request. They play a vital role in communication between servers and browsers, ensuring a smooth browsing experience. We have categorized HTTP status codes into five tiers, each representing different types of responses.

Furthermore, we have provided a detailed explanation of each category and discussed the specific meanings and implications of different status codes within each category. Understanding these status codes is essential for optimizing website performance and search engine optimization (SEO).

To aid your understanding, we have included a comprehensive table listing all 63 HTTP status codes along with their meanings and categories. This table serves as a quick reference, enabling you to easily identify and interpret various status codes.

We have also highlighted the importance of HTTP status codes and errors in relation to SEO. Different status codes can have a significant impact on search engine rankings. We have discussed specific status codes, such as 200 OK, 301 Moved Permanently, 302 Found, 404 Not Found, 410 Gone, and 5xx server errors, and their respective SEO implications.

To check the HTTP status code of a page, we have provided instructions on using Google Chrome and Google Search Console, two widely used tools for website analysis. These tools enable you to identify the status code and evaluate its meaning.

We have addressed common HTTP status codes such as 404 - Not Found and 503 - Service Unavailable and provided strategies for resolving these errors. Resolving these errors is crucial for maintaining a positive user experience and ensuring uninterrupted access to your website.

In summary, HTTP status codes are essential in website communication and provide valuable information about the success or failure of a request. Understanding their meanings and implications is crucial for optimizing website performance and SEO. By effectively managing HTTP status codes, you can ensure a seamless browsing experience for your users and improve search engine rankings.

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Why choose Zipy Error Monitoring? Here are some key features and benefits:

1. Real-time error monitoring: Zipy Error Monitoring actively monitors your website for any error occurrences, providing instant notifications so you can address them promptly.
2. HTTP status code analysis: Gain valuable insights into the different HTTP status codes your website generates, allowing you to understand the success or failure of each request.
3. Error resolution guidance: Zipy Error Monitoring offers comprehensive error reports and recommendations on how to resolve them, saving you time and effort in troubleshooting.
4. User experience improvement: By monitoring and resolving errors quickly, Zipy Error Monitoring enhances the user experience, ensuring seamless navigation and minimizing frustration.
5. Website performance optimization: Identifying and fixing errors promptly contributes to enhanced website performance, resulting in improved loading speeds and better search engine rankings.

With Zipy Error Monitoring, monitoring website errors and managing HTTP status codes becomes effortless, allowing you to focus on delivering an exceptional online experience to your audience. Ensure the stability and reliability of your website today with Zipy Error Monitoring.

Conclusion

Understanding and effectively managing HTTP status codes is crucial for website owners. By familiarizing yourself with these status codes, you can optimize your website and provide a seamless browsing experience for your users. In this comprehensive guide, we have covered all 63 HTTP status codes and their meanings.

HTTP status codes serve as web server responses to client requests, indicating the success or failure of a particular action. By interpreting these codes, you can quickly identify and troubleshoot any issues that may arise, whether they be client errors or server errors.

These status codes also play a significant role in search engine optimization (SEO). They impact how search engines perceive your website, affecting your search ranking and visibility. By understanding the impact of specific status codes, such as 200 OK, 301 Moved Permanently, and 404 Not Found, you can make informed decisions to optimize your site's SEO.

In conclusion, by grasping the significance of HTTP status codes and incorporating this knowledge into your website management, you can enhance user experience, resolve errors promptly, and improve your overall online presence. Take the time to familiarize yourself with the different status codes discussed in this guide, and make use of the tools and tips provided. Your efforts will result in a more efficient and user-friendly website.

FAQ

What are HTTP status codes?

HTTP status codes are three-digit numbers that indicate the outcome of a Hypertext Transfer Protocol (HTTP) request made by a web browser to a web server. They provide information regarding the success or failure of a request and are crucial for communication between the server and the browser.

How are HTTP status codes categorized?

HTTP status codes are categorized into five tiers based on their meaning and purpose. These tiers include informational (1xx), successful (2xx), redirection (3xx), client errors (4xx), and server errors (5xx) codes.

What is the significance of HTTP status codes for SEO?

HTTP status codes play a significant role in search engine optimization (SEO) as search engines interpret and respond to these codes. Certain status codes, such as 200 OK and 404 Not Found, can impact a website's search ranking and overall SEO performance.

How can I check the HTTP status code of a web page?

To monitor the HTTP Status Codes for your web pages, you can utilize tools like Google Chrome and Google Search Console. In Google Chrome, the Developer Tools section offers a straightforward method to view the HTTP Status Codes for any page. This feature is invaluable for web developers and content managers in identifying and troubleshooting HTTP Status Codes issues.

Google Search Console, on the other hand, provides a broader analysis of your website, including detailed reports on HTTP Status Codes. This tool allows webmasters to track the status of their pages on a larger scale, ensuring that all content is accessible and indexable by search engines.

How can I fix 404 errors?

404 errors, indicative of "Not Found" responses, are among the most common HTTP Status Codes encountered. These errors can detrimentally impact your website's user experience and SEO. To address 404 errors, it's essential to identify and rectify the broken links or missing pages. Strategies include redirecting the URLs to relevant content, designing custom 404 error pages to guide users back to your site, or updating your sitemap to reflect the current structure of your website. Efficiently managing these HTTP Status Codes can significantly improve site navigation and search engine visibility.

How can I fix 503 errors?

503 errors, representing "Service Unavailable" HTTP Status Codes, often occur due to server overload or maintenance activities. Addressing these errors involves enhancing your server's capacity, optimizing your website for better performance, or setting up a temporary alternative website version. By effectively managing these HTTP Status Codes, you can ensure that your site remains accessible to users and search engines, even during peak traffic periods or scheduled maintenance.