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What a 504 Gateway Timeout Error is, and How to Fix it

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How To Fix a 504 Gateway Timeout Error

The 504 Gateway Timeout Error. It’s one of the many server-side issues that prevents your website from loading properly. It’s frustrating to see, especially for your users. 

Think of it like walking up to a busy restaurant; if your waiter doesn’t come to your table in time, you will get frustrated and consider leaving–that’s what your users will do if they see a 504 error on your website. And every second it’s up, it’ll keep hurting your website’s performance and rankings.

So how do you fix a 504 Gateway Timeout error? Well, keep reading. This article will help you understand them in detail, and teach you how to diagnose and fix it.

What is a 504 Gateway Timeout Error?

A 504 Gateway Timeout error is one of the many status codes that can be returned by a web server.

Whenever a user wants to load a page on your website, their web server will attempt to communicate with an upstream server, on which all of your website’s content and data is stored. If this connection is successful, then the page will load like normal.

But in this step, mistakes can happen. In the case of 504 errors, the mistake is this: these two servers are unable to communicate fast enough–which prevents the page’s content from being sent, leading to a timeout of sorts. 

Webmaster’s Note: This post is part of our advanced guide to Technical SEO, where I cover everything you need to know about crawlability, indexing, and page speed optimization, as well as helpful tips on how to troubleshoot common website errors. I also cover other 5xx errors in other posts.

Like other 5xx errors, websites can show a 504 error in many different ways. 

Variations of the 503 Service Unavailable Error

  • 504 Gateway Timeout
  • Gateway Timeout Error
  • HTTP 504 Error
  • Gateway Timeout (504)
  • 504 Error
  • HTTP Error 504 – Gateway Timeout
  • The page request got canceled because it took too long to complete.
  • 504 Gateway Time-out – The server didn’t respond in time.
  • This page isn’t working – Domain took too long to respond.

How Do I Fix the 504 Gateway Timeout Error?

Since a 504 Gateway Timeout Error is generic, you need to do some trial and error to find what exactly is causing the communication breakdown between the web server and the upstream server. Here are the steps you can take to resolve the issue:

  1. Check your internet connection
  2. Reload the page
  3. Clear browser cache
  4. Wait and retry
  5. Check server status
  6. Monitor server health
  7. Optimize server configuration
  8. Load balancing
  9. Check upstream server health
  10. Increase timeout settings
  11. Implement caching
  12. Use a Content Delivery Network (CDN)
  13. Resolve Domain Name System (DNS) issues
  14. Review your third-party services
  15. Monitor and test

Check your Internet Connection

If you’re experiencing the error as an end user, ensure that your internet connection is stable and functioning properly. Sometimes, network issues on your end could be causing the error.

Reload the Page

Sometimes, the error might be temporary. Try reloading the page by pressing F5 or using the refresh button in your browser.

Clear Browser Cache

Cached data can sometimes cause issues, which can show a 504 error on your end (but not necessarily all of the users trying to load your website). Clear your browser’s cache and cookies, and then try accessing the site again. 

Wait and Retry

The 504 error might be caused by a temporary server overload, especially if it’s getting a lot more traffic than you usually do. To see if this is the cause, just wait for a while and then try accessing your site again. The issue might resolve itself once the server load decreases. 

Check Server Status

Contact your server host or check your website’s backend to see if the administrators have acknowledged any ongoing issues or maintenance. If so, the issue can be resolved once your server is back online.

Monitor Server Health

If you’re managing your website yourself, you should monitor your server’s health, CPU usage, memory usage, and network traffic. This will help you check if your server is currently experiencing high, sudden traffic load, or dealing resource constraints. If so, then it’s a likely culprit to your 504 error.

Optimize Server Configuration

Review and optimize your server’s configuration settings, including proxy and gateway configurations. Ensure that these settings are correctly configured to support quick communication between web servers and upstream servers. Here’s a guide you can use to avoid server misconfiguration issues if your web maintenance is done in-house. 

Load Balancing

If possible, try to implement or adjust load balancing mechanisms to distribute incoming traffic more evenly among multiple servers. This can help prevent overloading.

Check Upstream Server Health

Ensure that the upstream server is healthy and responsive. Monitor its resource usage, check for any ongoing maintenance, and address any issues.

Increase Timeout Settings

Adjust the timeout settings on the gateway server to provide more time for the upstream server to respond, especially if the server processing is naturally slow.

Implement Caching

Implement caching mechanisms to store frequently accessed content on the server. This can help reduce the load on your upstream servers, and reduce the chances of loading issues like a 504 Gateway Timeout error. 

Use a Content Delivery Network (CDN)

Use a CDN to distribute content across several servers in different locations. This can help deliver your website’s content even to users located far from your main server, which also alleviates server load and improves overall site speed

Resolve Domain Name System (DNS) Issues

Check your DNS–particularly your DNS cache. If it’s outdated or corrupted, it could be causing an HTTP error 504 code. Otherwise, if you have recently changed your domain’s DNS server, then web servers might still be trying to find your website with the old DNS records stored in your Operating System’s cache.

In both cases, fixing the error is simple: you just need to flush your DNS cache.

Review Third-Party Services

If your website relies on third-party services or plugins, make sure they are functioning properly. Sometimes, issues with external services can impact your site’s performance.

Monitor and Test

Continuously monitor your website’s performance, conduct regular load testing, and be prepared to scale your infrastructure as needed.

Remember that resolving a 504 Gateway Timeout error might require you to work with your hosting provider and website development team, especially if the issue involves server configurations or network problems.

If you’re having trouble maintaining your website, SEO Hacker also offers web development and design services–we have years of experience creating beautiful, functional, and SEO-friendly websites from the ground up.

What Can Cause a 504 Gateway Timeout Error?

A 504 Gateway Timeout error can be caused by many things that affect the communication and responsiveness between two servers in your web infrastructure. Here are some common causes:

  1. Slow upstream server 
  2. Network connectivity issues
  3. Server misconfiguration
  4. Server overload
  5. Maintenance or downtime
  6. DNS issues

Slow Upstream Server 

Imagine a busy toll booth on a highway. If too many vehicles are trying to pass through the toll booth at once, the toll collectors might struggle to process all the transactions quickly. 

Similarly, if the server that needs to process requests from the gateway is overwhelmed with too many requests, it might not be able to respond on time, causing a 504 error.

A slow upstream server can cause a 504 gateway timeout error because the upstream server’s delayed processing and generation of a response exceeds the timeout threshold set by the gateway server. 

Network Connectivity Issues

Network issues can cause a 504 Gateway Timeout error because they disrupt the smooth flow of data between the gateway server and the upstream server, leading to delays in communication. 

Think of a telephone conversation between two people. If there’s static or interference on the line, the conversation might become garbled or drop altogether. Similarly, if there are network problems or “static” between the gateway and the upstream server, the communication might be delayed or disrupted, leading to a timeout error. 

Server Misconfiguration

Server misconfiguration can cause a 504 Gateway Timeout error due to improper settings or configurations that hinder the communication between the gateway server and the upstream server.

When you introduce processing bottlenecks, incorrect routing, or other issues that hinder the timely communication between the gateway server and the upstream server, that’s when server misconfiguration takes place. 

Imagine a translator who is supposed to convey messages between two individuals who speak different languages. If the translator misunderstands the message or doesn’t know the language well, there’s going to be a communication breakdown. 

Likewise, if the server configurations are not set up correctly, then the intended message might not get through, resulting in a 504 error. 

Server Overload

To understand why server overload causes a 504 Gateway Timeout error, picture a chef trying to prepare multiple complex dishes at the same time in a small kitchen. With too many tasks to handle, the chef might start to slow down and struggle to keep up with the orders. 

Similarly, if the gateway server is trying to manage too many incoming and outgoing requests simultaneously, it’s going to struggle to accommodate those requests, eventually leading to timeouts. 

Server overloads can happen if there’s a sudden surge of visitors on your website, or if your website is experiencing a malicious attack. Either way, this causes your server to exhaust its resources, which prevents it from accommodating user requests, leading potentially to 504 errors.

Maintenance or Downtime

Your server being in maintenance or downtime means that it just won’t respond to any server requests. It’s like a bridge that’s temporarily closed for maintenance. During this time, cars cannot cross the bridge, causing delays. It’s the same for your website–if the server is down or temporarily unavailable, it won’t respond to requests, resulting in a timeout error. 

DNS Issues

DNS issues can cause a 504 Gateway Timeout error when your DNS fails to resolve the IP address of the upstream server, preventing the gateway server from establishing a connection. 

The timeout mechanism on the gateway server is in place to ensure that requests don’t hang indefinitely, but if the DNS issues hinder IP address resolution, the gateway server generates the 504 error message. 

Imagine trying to find a specific house in a new town without a proper address. If you can’t locate the house’s address, you won’t be able to reach your destination. Similarly, if there are problems with DNS resolution, the gateway server might not be able to locate the IP address of the upstream server, preventing communication. 

How 504 Gateway Timeout Errors Affect SEO

504 Gateway Timeout errors can have negative implications for user experience, which means they can also hurt your SEO (Search Engine Optimization) and website rankings. 

  • User Experience – User experience is a critical factor for SEO. When visitors encounter 504 errors, it reflects poorly on the website’s reliability and can frustrate users. Users who experience such errors are more likely to leave the site and seek information or services elsewhere.
  • Crawling and Indexing – Search engine crawlers regularly scan websites to index their content. If these crawlers encounter 504 errors while trying to access specific pages, they might not be able to index the content properly. This can affect how well your content ranks in search results.
  • Website Accessibility – If search engines find that a website frequently returns 504 errors, they might consider the site less accessible and reliable. This could potentially impact how search engines rank the site over time.
  • Algorithm Updates – While not a direct factor in search engine algorithms, user experience is becoming increasingly important for search engine rankings. Search engines aim to provide the best results for users, and sites with frequent 504 errors might be perceived as less user-friendly.
  • Backlinks and Referrals – If other websites link to your site and users encounter 504 errors when following those links, it can negatively affect your referral traffic and potential backlinks, which can influence SEO.
  • Indexing Frequency – Search engines might adjust how often they crawl and index your site based on its reliability and uptime. Frequent 504 errors could result in less frequent indexing, affecting how quickly new content is added to search results.
  • Competitive Advantage – A website that consistently provides a smooth user experience, without 504 errors, could gain a competitive advantage over sites that keep serving them. This advantage might translate to more engagement and longer visit durations.

To mitigate the potential negative impact of 504 Gateway Timeout errors on SEO, it’s crucial to promptly address the underlying issues causing these errors. Regular monitoring of server health, configurations, and network infrastructure can help prevent or minimize the occurrence of such errors. 

In addition, providing clear error messages to users and maintaining an informative maintenance page during planned downtimes can also contribute to a better user experience.

Key Takeaway

504 Gateway Timeout errors can happen from time to time on your website, so keep this troubleshooting guide in mind whenever you see this error message pop up on your pages. Fixing this as quickly as possible is key to maintaining seamless user experience, and ultimately contributes to a website’s reputation and effectiveness. 

With the right knowledge and tools, you can get past this hiccup, lessen its effect on your website, and continue delivering a great online experience to your audience.

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Google Clarifies Organization Merchant Returns Structured Data

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Google updates organization structured data for merchant returns

Google quietly updated their organization structured data documentation in order to clarify two points about merchant returns in response to feedback about an ambiguity in the previous version.

Organization Structured Data and Merchant Returns

Google recently expanded their Organization structured data so that it could now accommodate a merchant return policy. The change added support for adding a sitewide merchant return policy.

The original reason for adding this support:

“Adding support for Organization-level return policies

What: Added documentation on how to specify a general return policy for an Organization as a whole.

Why: This makes it easier to define and maintain general return policies for an entire site.”

However that change left unanswered about what will happen if a site has a sitewide return policy but also has a different policy for individual products.

The clarification applies for the specific scenario of when a site uses both a sitewide return policy in their structured data and another one for specific products.

What Takes Precedence?

What happens if a merchant uses both a sitewide and product return structured data? Google’s new documentation states that Google will ignore the sitewide product return policy in favor of a more granular product-level policy in the structured data.

The clarification states:

“If you choose to provide both organization-level and product-level return policy markup, Google defaults to the product-level return policy markup.”

Change Reflected Elsewhere

Google also updated the documentation to reflect the scenario of the use of two levels of merchant return policies in another section that discusses whether structured data or merchant feed data takes precedence. There is no change to the policy, merchant center data still takes precedence.

This is the old documentation:

“If you choose to use both markup and settings in Merchant Center, Google will only use the information provided in Merchant Center for any products submitted in your Merchant Center product feeds, including automated feeds.”

This is the same section but updated with additional wording:

“If you choose to use both markup (whether at the organization-level or product-level, or both) and settings in Merchant Center, Google will only use the information provided in Merchant Center for any products submitted in your Merchant Center product feeds, including automated feeds.”

Read the newly updated Organization structured data documentation:

Organization (Organization) structured data – MerchantReturnPolicy

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What Is It & How To Write It

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What Is It & How To Write It

In this guide, you will learn about alternative text (known as alt text): what it is, why it is important for on-page SEO, how to use it correctly, and more.

It’s often overlooked, but every image on your website should have alt text. More information is better, and translating visual information into text is important for search engine bots attempting to understand your website and users with screen readers.

Alt text is one more source of information that relates ideas and content together on your website.

This practical and to-the-point guide contains tips and advice you can immediately use to improve your website’s image SEO and accessibility.

What Is Alt Text?

Alternative text (or alt text) – also known as the alt attribute or the alt tag (which is not technically correct because it is not a tag) – is simply a piece of text that describes the image in the HTML code.

What Are The Uses Of Alt Text?

The original function of alt text was simply to describe an image that could not be loaded.

Many years ago, when the internet was much slower, alt text would help you know the content of an image that was too heavy to be loaded in your browser.

Today, images rarely fail to load – but if they do, then it is the alt text you will see in place of an image.

Screenshot from Search Engine Journal, May 2024

Alt text also helps search engine bots understand the image’s content and context.

More importantly, alt text is critical for accessibility and for people using screen readers:

  • Alt text helps people with disabilities (for example, using screen readers) learn about the image’s content.

Of course, like every element of SEO, it is often misused or, in some cases, even abused.

Let’s now take a closer look at why alt text is important.

Why Alt Text Is Important

The web and websites are a very visual experience. It is hard to find a website without images or graphic elements.

That’s why alt text is very important.

Alt text helps translate the image’s content into words, thus making the image accessible to a wider audience, including people with disabilities and search engine bots that are not clever enough yet to fully understand every image, its context, and its meaning.

Why Alt Text Is Important For SEO

Alt text is an important element of on-page SEO optimization.

Proper alt text optimization makes your website stand a better chance of ranking in Google image searches.

Yes, alt text is a ranking factor for Google image search.

Depending on your website’s niche and specificity, Google image search traffic may play a huge role in your website’s overall success.

For example, in the case of ecommerce websites, users very often start their search for products with a Google image search instead of typing the product name into the standard Google search.

Screenshot from search for [Garmin forerunner]Screenshot from search for [Garmin forerunner], May 2024

Google and other search engines may display fewer product images (or not display them at all) if you fail to take care of their alt text optimization.

Without proper image optimization, you may lose a lot of potential traffic and customers.

Why Alt Text Is Important For Accessibility

Visibility in Google image search is very important, but there is an even more important consideration: Accessibility.

Fortunately, in recent years, more focus has been placed on accessibility (i.e., making the web accessible to everyone, including people with disabilities and/or using screen readers).

Suppose the alt text of your images actually describes their content instead of, for example, stuffing keywords. In that case, you are helping people who cannot see this image better understand it and the content of the entire web page.

Let’s say one of your web pages is an SEO audit guide that contains screenshots from various crawling tools.

Would it not be better to describe the content of each screenshot instead of placing the same alt text of “SEO audit” into every image?

Let’s take a look at a few examples.

Alt Text Examples

Finding many good and bad examples of alt text is not difficult. Let me show you a few, sticking to the above example with an SEO audit guide.

Good Alt Text Examples

So, our example SEO guide contains screenshots from tools such as Google Search Console and Screaming Frog.

Some good examples of alt text may include:

”The
”Google
”List
”Screaming

Tip: It is also a good idea to take care of the name of your file. Using descriptive file names is not a ranking factor, but I recommend this as a good SEO practice.

Bad And/Or Spammy Alt Text Examples

I’ve also seen many examples of bad alt text use, including keyword stuffing or spamming.

Here is how you can turn the above good examples into bad examples:

”google search console coverage report
”google
”seo
”seo

As you can see, the above examples do not provide any information on what these images actually show.

You can also find examples and even more image SEO tips on Google Search Central.

Common Alt Text Mistakes

Stuffing keywords in the alt text is not the only mistake you can make.

Here are a few examples of common alt text mistakes:

  • Failure to use the alt text or using empty alt text.
  • Using the same alt text for different images.
  • Using very general alt text that does not actually describe the image. For example, using the alt text of “dog” on the photo of a dog instead of describing the dog in more detail, its color, what it is doing, what breed it is, etc.
  • Automatically using the name of the file as the alt text – which may lead to very unfriendly alt text, such as “googlesearchconsole,” “google-search-console,” or “photo2323,” depending on the name of the file.

Alt Text Writing Tips

And finally, here are the tips on how to write correct alt text so that it actually fulfills its purpose:

  • Do not stuff keywords into the alt text. Doing so will not help your web page rank for these keywords.
  • Describe the image in detail, but still keep it relatively short. Avoid adding multiple sentences to the alt text.
  • Use your target keywords, but in a natural way, as part of the image’s description. If your target keyword does not fit into the image’s description, don’t use it.
  • Don’t use text on images. All text should be added in the form of HTML code.
  • Don’t write, “this is an image of.” Google and users know that this is an image. Just describe its content.
  • Make sure you can visualize the image’s content by just reading its alt text. That is the best exercise to make sure your alt text is OK.

How To Troubleshoot Image Alt Text

Now you know all the best practices and common mistakes of alt text. But how do you check what’s in the alt text of the images of a website?

You can analyze the alt text in the following ways:

Inspecting an element (right-click and select Inspect when hovering over an image) is a good way to check if a given image has alt text.

However, if you want to check that in bulk, I recommend one of the below two methods.

Install Web Developer Chrome extension.

Screenshot of Web Developer Extension in Chrome by authorScreenshot from Web Developer Extension, Chrome by author, May 2024

Next, open the page whose images you want to audit.

Click on Web Developer and navigate to Images > Display Alt Attributes. This way, you can see the content of the alt text of all images on a given web page.

The alt text of images is shown on the page.Screenshot from Web Developer Extension, Chrome by author, May 2024

How To Find And Fix Missing Alt Text

To check the alt text of the images of the entire website, use a crawler like Screaming Frog or Sitebulb.

Crawl the site, navigate to the image report, and review the alt text of all website images, as shown in the video guide below.

You can also export only images that have missing alt text and start fixing those issues.

Alt Text May Not Seem Like A Priority, But It’s Important

Every source of information about your content has value. Whether it’s for vision-impaired users or bots, alt text helps contextualize the images on your website.

While it’s only a ranking factor for image search, everything you do to help search engines understand your website can potentially help deliver more accurate results. Demonstrating a commitment to accessibility is also a critical component of modern digital marketing.

FAQ

What is the purpose of alt text in HTML?

Alternative text, or alt text, serves two main purposes in HTML. Its primary function is to provide a textual description of an image if it cannot be displayed. This text can help users understand the image content when technical issues prevent it from loading or if they use a screen reader due to visual impairments. Additionally, alt text aids search engine bots in understanding the image’s subject matter, which is critical for SEO, as indexing images correctly can enhance a website’s visibility in search results.

Can alt text improve website accessibility?

Yes, alt text is vital for website accessibility. It translates visual information into descriptive text that can be read by screen readers used by users with visual impairments. By accurately describing images, alt text ensures that all users, regardless of disability, can understand the content of a web page, making the web more inclusive and accessible to everyone.

More resources: 


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Google Dials Back AI Overviews In Search Results, Study Finds

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Photo of a mobile device in mans hand with generative google AI Overview on the screen.

According to new research, Google’s AI-generated overviews have undergone significant adjustments since the initial rollout.

The study from SE Ranking analyzed 100,000 keywords and found Google has greatly reduced the frequency of AI overviews.

However, when they appear, they’re more detailed than they were previously.

The study digs into which topics and industries are more likely to get an AI overview. It also looks at how the AI snippets interact with other search features like featured snippets and ads.

Here’s an overview of the findings and what they mean for your SEO efforts.

Declining Frequency Of AI Overviews

In contrast to pre-rollout figures, 8% of the examined searches now trigger an AI Overview.

This represents a 52% drop compared to January levels.

Yevheniia Khromova, the study’s author, believes this means Google is taking a more measured approach, stating:

“The sharp decrease in AI Overview presence likely reflects Google’s efforts to boost the accuracy and trustworthiness of AI-generated answers.”

Longer AI Overviews

Although the frequency of AI overviews has decreased, the ones that do appear provide more detailed information.

The average length of the text has grown by nearly 25% to around 4,342 characters.

In another notable change, AI overviews now link to fewer sources on average – usually just four links after expanding the snippet.

However, 84% still include at least one domain from that query’s top 10 organic search results.

Niche Dynamics & Ranking Factors

The chances of getting an AI overview vary across different industries.

Searches related to relationships, food and beverages, and technology were most likely to trigger AI overviews.

Sensitive areas like healthcare, legal, and news had a low rate of showing AI summaries, less than 1%.

Longer search queries with ten words were more likely to generate an AI overview, with a 19% rate indicating that AI summaries are more useful for complex information needs.

Search terms with lower search volumes and lower cost-per-click were more likely to display AI summaries.

Other Characteristics Of AI Overviews

The research reveals that 45% of AI overviews appear alongside featured snippets, often sourced from the exact domains.

Around 87% of AI overviews now coexist with ads, compared to 73% previously, a statistic that could increase competition for advertising space.

What Does This Mean?

SE Ranking’s research on AI overviews has several implications:

  1. Reduced Risk Of Traffic Losses: Fewer searches trigger AI Overviews that directly answer queries, making organic listings less likely to be demoted or receive less traffic.
  2. Most Impacted Niches: AI overviews appear more in relationships, food, and technology niches. Publishers in these sectors should pay closer attention to Google’s AI overview strategy.
  3. Long-form & In-Depth Content Essential: As AI snippets become longer, companies may need to create more comprehensive content beyond what the overviews cover.

Looking Ahead

While the number of AI overviews has decreased recently, we can’t assume this trend will continue.

AI overviews will undoubtedly continue to transform over time.

It’s crucial to monitor developments closely, try different methods of dealing with them, and adjust game plans as needed.


Featured Image: DIA TV/Shutterstock

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