Web Development

How to Fix an HTTP 304 Status Code?

Have you ever encountered an HTTP 304 status code while browsing the web? Perhaps you were trying to access a website, and instead of seeing the expected content, you were presented with…

Estimated Read Time:  10 minutes


304 status code

Have you ever encountered an HTTP 304 status code while browsing the web?

Perhaps you were trying to access a website, and instead of seeing the expected content, you were presented with this enigmatic status code. Don’t worry; you’re not alone in wondering what it means and how to fix it.

In this guide, we will explore the causes behind HTTP 304 errors, troubleshoot the underlying issues, and present practical solutions for resolving them.

Short Summary

  • The HTTP 304 status code indicates that the requested resource has not been modified since the last request, and the browser can use its cached version.

  • Common causes of HTTP 304 errors include caching issues, incorrectly configured web servers, problems with conditional requests, and client-side caching mechanisms.

  • To fix HTTP 304 errors, you can start by clearing your browser cache to ensure you’re not using outdated cached data.

Understanding the HTTP 304 Status Code

Understanding the HTTP 304 Status Code

The HTTP 304 status code, also known as “Not Modified,” is a server response that indicates the requested resource has not been modified since the last time it was accessed by the client. When a client makes a request for a web page or a resource, the server includes an entity tag (ETag) or a last-modified timestamp in the response headers.

If the client sends another request for the same resource and includes the ETag or the If-Modified-Since header, the server can compare the provided information with the current version of the resource.

If there have been no modifications, the web server responds with the HTTP status code 304, instructing the client to use its locally cached copy of the resource, thereby reducing bandwidth usage and improving performance.

Differences between a 304 and Other HTTP Status Codes:

  1. 304 vs. 200 (OK): The HTTP 200 status code indicates a successful request and a full response from the server, whereas 304 implies that the requested resource has not changed and the client should use its cached version.

  2. 304 vs. 404 (Not Found): While a 404 status code signifies that the requested resource is not available on the server, a 304 indicates that the resource is present, but it has not been modified since the last request.

  3. 304 vs. 302 (Found/Redirect): Unlike a 302 redirect, which instructs the client to redirect to a different URL, a 304 response keeps the client on the same URL but indicates that the cached version of the resource can be used.

Understanding these distinctions is crucial for troubleshooting and resolving issues related to HTTP 304 status codes effectively. In the following sections, we will explore common causes of HTTP 304 errors and provide solutions to fix them.

Common Causes of HTTP 304 Errors

Common Causes of HTTP 304 Errors

Encountering HTTP 304 errors can be frustrating, but understanding their underlying causes is key to resolving them.

Let’s explore some of the common factors that can trigger these errors:

Caching Issues

Caching plays a vital role in optimizing web performance by storing copies of resources locally. However, if caching is not properly configured or managed, it can lead to HTTP 304 errors.

When the client’s cache is outdated or misaligned with the server’s cache directives, the client may send conditional requests, expecting the server to respond with a 304 not modified status code if the resource remains unchanged. Any discrepancy in caching settings or improper cache validation can result in errors.

Incorrectly Configured Web Servers

Misconfigurations on the server side can also contribute to HTTP 304 errors. For instance, if the server fails to generate appropriate ETags or last-modified timestamps for resources, the client may not be able to send accurate conditional requests.

Additionally, incorrect caching headers or server-side cache control directives can hinder the proper functioning of caching mechanisms.

Problems with Conditional Requests

HTTP 304 errors are closely tied to conditional requests, which rely on headers like If-None-Match and If-Modified-Since. If these headers are missing or incorrectly implemented, it can lead to erroneous responses from the server.

Similarly, if the server fails to handle conditional requests properly, it may not send the expected 304 response even when the resource has not been modified.

Client-side Caching Mechanisms

Client-side caching mechanisms, such as web browsers, can contribute to HTTP 304 errors. If the browser’s cache is overly aggressive or misbehaving, it may not send conditional requests when needed or may not update its cache correctly, leading to unnecessary requests and potential errors.

How to Fix an HTTP 304 Status Code (8 Potential Methods)

How to Fix an HTTP 304 Status Code (8 Potential Methods)

Encountering an HTTP 304 status code can be resolved through various methods.

Let’s explore eight potential fixes that can help you resolve this issue effectively:

Clearing Browser Cache

Clearing your browser’s cache ensures that you start with a clean slate. Sometimes, an outdated or corrupted cache can interfere with proper resource retrieval. To clear the cache, locate the settings or preferences menu in your browser.

Look for options related to browsing data or cache, and choose to clear the cache. This action will remove any stored copies of web pages or resources, prompting your browser to fetch the latest versions from the server.

Verifying Server-side Caching Settings

Check your server’s caching settings to ensure they are correctly configured. Review cache-control headers, expiration directives, and validation mechanisms to ensure proper cache handling. Adjust these settings based on your specific requirements.

For example, you can set appropriate cache-control headers like “public” or “private” to control caching behavior. Additionally, consider setting expiration dates or maximum age values to specify how long the resource should be considered fresh in the cache.

Checking Conditional Request Headers

Inspect the conditional request headers, such as If-None-Match and If-Modified-Since, sent by the client. Ensure that they are correctly included in the request and match the appropriate ETag or last-modified timestamp of the resource.

The If-None-Match header should contain the ETag value received from the server, while the If-Modified-Since header should contain the last-modified timestamp. Double-check these values and ensure they are formatted correctly to enable accurate cache validation.

Ensuring Proper Handling of Cache Validation

Proper cache validation is crucial for the server to determine whether the requested resource has been modified. Implement mechanisms such as ETags and last-modified timestamps for accurate cache validation.

The server should compare the ETag value or the last-modified timestamp provided by the client with the current version of the resource. If they match, the server should respond with the HTTP 304 status code, indicating that the client can use its cached copy. Implementing this validation logic correctly ensures that unnecessary data transfers are avoided when the resource remains unchanged.

Try Using the Google Public DNS

Sometimes, DNS (Domain Name System) issues can contribute to HTTP 304 errors. By switching to a reliable DNS service like Google Public DNS, you can potentially resolve these issues. Here’s how to do it:

  1. Open the network settings on your device (computer, smartphone, etc.).

  2. Locate the DNS settings section in Internet Protocol Version 4.

  3. Replace the following DNS server addresses with the following Google Public DNS addresses:

    • Preferred DNS server:

    • Alternate DNS server: These addresses ensure a fast and reliable DNS resolution.

  4. Save the changes and restart your device.

  5. After rebooting, try accessing the web page that was previously triggering the HTTP 304 error. The Google Public DNS may help resolve any DNS-related issues and establish a stable connection, potentially eliminating the error.

Check Your Server Configuration Files for Incorrect Redirect Instructions

If none of the previous methods corrected the error message, the issue may be on your server configuration file. Checking server configuration files for incorrect redirect instructions is an essential step in resolving HTTP 304 errors.

By examining the configuration files specific to your web server software, such as Apache, Nginx, or IIS, you can identify and correct any misconfigured or conflicting redirect rules.

Look for directives like “Redirect,” “RewriteRule,” or “location” that may be causing improper redirection. Ensure that the target URLs are accurate and don’t result in unintended loops or errors. Once you’ve made the necessary corrections, restart your web server to apply the changes.

By addressing any incorrect redirect instructions, you can effectively eliminate potential causes of HTTP 304 errors and ensure smooth redirection on your website.

Run a Malware Scan

Sometimes, malware or malicious extensions can interfere with web requests and cause HTTP 304 errors. Running a malware scan on your system using reputable antivirus software can help detect and eliminate any potential threats.

Ensure that your antivirus software is up to date and perform a thorough scan of your system. If any malware or suspicious files are detected, follow the recommended steps to remove them. Once the scan and removal process is complete, restart your system and check if the HTTP 304 error persists.

Disable Your Browser’s Extensions

Extensions or add-ons in your browser can occasionally cause conflicts or interfere with web requests, leading to HTTP 304 errors. To identify if an extension is causing the issue, try disabling them temporarily. Go to your browser’s extension or add-on management settings and disable all installed extensions.

After disabling the extensions, reload the web page that was previously triggering the HTTP 304 error. If the error is no longer present, it indicates that one or more of the extensions were causing the conflict. You can then enable the extensions one by one to identify the specific one causing the issue and consider removing or updating it.

By employing these potential fixes, you can effectively address HTTP 304 status code errors. However, if the issue persists, it may require further investigation or consultation with web development professionals.


The HTTP 304 status code, also known as “Not Modified,” plays a crucial role in optimizing web performance by allowing clients to utilize their cached copies of resources when they haven’t changed.

Throughout this comprehensive guide, we have explored the definition and purpose of HTTP 304, discussed its differences from other status codes, and delved into common causes and fixes for HTTP 304 errors. Troubleshooting and resolving these errors are vital as they ensure efficient data transfers and enhance browsing experiences.

To avoid future errors, it is essential to implement best practices such as optimizing cache control headers, proper cache validation mechanisms, and regular monitoring and updating of caching configurations.

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Frequently Asked Questions

How can I fix an HTTP 304 status code error?

Fixing an HTTP 304 error code involves various methods, including clearing browser cache, verifying server-side caching settings, checking conditional request headers, ensuring proper handling of cache validation, running a malware scan, and disabling browser extensions. These approaches help address common causes of HTTP 304 errors and resolve them effectively.

Why is it important to troubleshoot and fix HTTP 304 errors?

Troubleshooting and fixing HTTP 304 errors are crucial for optimizing web performance and user experience. By resolving website errors and properly maintaining your website, you can ensure efficient data transfers, reduce unnecessary server requests, and enhance website speed and responsiveness. It also helps maintain the integrity of cache systems and ensures that clients receive the most up-to-date resources when necessary.

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