What do 304 mean

When you do encounter a status code, it usually means that something has gone wrong. HTTP status codes fall into one of five categories, numbered between the s and s. Each series indicates a different type of problem. They make it clear that the information being requested was either temporarily or permanently substituted with another resource.

The Not Modified status code indicates that a conditional GET or HEAD request has been received and would have resulted in a OK response if it were not for the fact that the condition evaluated to false. In other words, there is no need for the server to transfer a representation of the target resource because the request indicates that the client, which made the request conditional, already has a valid representation; the server is therefore redirecting the client to make use of that stored representation as if it were the payload of a OK response.

In turn, your browser retrieves a saved version of the web page from the cache. The purpose of this is to improve page speed and delivery , by preventing your browser from having to repeatedly download the same information.

The server inspects these headers and also looks at the ETag value. The latter is a unique identifier used to specify the version of a particular resource. If the values for these files are the same, the server sends the HTTP Not Modified response header and the browser uses the cached copy of the resource. If the browser copy is outdated, meaning that the file has been modified since the last request, it sends an HTTP code and a new copy is used.

The most common causes include:. The status code can be due to a problem on either the server-side or the client-side, so it might take some troubleshooting in order to diagnose and resolve it. The methods you can use to resolve an HTTP status code vary from simple to fairly technical.

Search engines are responsible for indexing and caching websites , so this issue can usually be traced back to the browser being used to access the site. However, understanding what may be causing the issue for visitors can be helpful, either when trying to find a solution on your end or assisting them directly.

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Many smart phone apps that have a modern looking user interface are actually powered by a normal web application behind the scenes; one that is simply hidden from the user. Instead, it will be something on the server-side, which is performing most of the logic and processing behind the scenes, outside the purview of the local interface presented to the user.

If your application is generating unexpected Not Modified response codes there are a number of steps you can take to diagnose the problem. As such, it is critical that you perform a full backup of your application, database, and so forth, before attempting any fixes or changes to the system.

This will give you a clean testing ground with which to test all potential fixes to resolve the issue, without threatening the security or sanctity of your live application. A Not Modified response code indicates that the requested resource has not been modified since the previous transmission. This typically means there is no need to retransmit the requested resource to the client, and a cached version can be used, instead. Here are some additional tips to help you troubleshoot what might be causing the Not Modified to appear on the server-side of things:.

Your application is likely running on a server that is using one of the two most popular web server softwares, Apache or nginx. Thus, one of the first steps you can take to determine what might be causing these Not Modified response codes is to check the configuration files for your web server software for unintentional redirect instructions.

If your web server is Apache then look for an. Save the modified configuration file then restart the Apache web server to see if this fixed the problem. By default this file is named nginx.