Using site speed detection services such as Pingdom, GTmetrix, or Google Pagespeed Insights, you may see a confusing warning ” Specify a Vary: Accept-Encoding header. ” Vary: Accept-Encoding is an HTTP header that makes sure the client will accept your gzip-compressed resources. It is with the absence of this heading that the warning is associated. In this topic, we will discuss how to fix the “Specify a Vary: Accept-Encoding Header” Warning.
What Does This Warning Mean?
Before we go about this problem’s problem-solution, let’s examine what this error is and where we can see a vary: accept-encoding header warning. This error is often a problem encountered with special web servers such as Apache and Nginx.
What is the Source of the “Specify a Vary: Accept-Encoding Header” Problem?
The accept-encoding header functions as the HTTP header with responses included on all source servers. This process’s main task is to understand by browsers that the website is using compressed versions.
When CDN or private servers do not use this header, they are likely to see the “Vary: Accept-Encoding” error. This will mean that websites on both systems are using uncompressed versions. While this process is not urgent or essential, it is useful for visitors’ speed performance to your site.
Where Can I Find This Problem?
The easiest way for website owners to find out if they have this error; They can access performance analysis using tools such as GTmetrix or Pingdom. Using such tools, you can see errors in your performance. If you have this title error, do not worry, we will tell you how the problem was solved in detail in our titles below.
Fixing “Specify a Vary: Accept-Encoding” Header
To add this header to Apache, add the following code to your .htaccess file via FTP or online file manager. This file can be found in the server root folder.
Important! Editing .htaccess can break your site. If you are doing this for the first time, you must first read more about this file or contact the hosting support service.
<IfModule mod_headers.c> <FilesMatch ". (Js | css | xml | gz | html) $"> Header append Vary: Accept-Encoding </FilesMatch> </IfModule>
“Vary Header: Accept-Encoding” in NGINX
Time needed: 30 minutes.
Here are the steps you need to take in Nginx
- Add header.
To add a header to NGINX, add the following code to your config file. All NGINX configuration files are discovered in the / etc / nginx / directory. The principal configuration file is /etc/nginx/nginx.conf. sudo nano /etc/nginx/nginx.conf
- Find the compression heading.
In the file that opens, try to find the compression heading. We will assume that you already have gzip compression configured and enabled. In this case, add a line like this: gzip_vary on
- Check if your configurations are correct.
Then check if your configurations are correct and restart NGINX: sudo service nginx configtest … sudo service nginx restart.
FAQs About How to Fix “Specify a Vary Accept-Encoding” Header
The Specify a Vary: Accept-Encoding Header error is a problem you will encounter with special web servers such as Apache and Nginx.
The accept-encoding header functions as the HTTP header with responses included on all source servers.
They are likely to see the “Vary: Accept-Encoding” error. Another reason for this error to pop up is that websites on both systems are using uncompressed versions.
You can access performance analysis using tools such as GTmetrix or Pingdom.
If this is your first time, you should first read more about this file or contact the hosting support service.
How to Fix “Specify a Vary: Accept-Encoding” Header in Short
One of the most critical issues for site owners and visitors is site performance. Therefore, you should eliminate the problems that affect your site performance. We have explained the solution of the “Specify a Vary: Accept-Encoding Header ” problem, which is one of these problems.
When you apply the items we mentioned in our topic carefully, you can quickly solve Nginx or Apache servers’ errors. The most important thing is that when you use these codes on your server, add them carefully because an incorrect action could damage your server. Now that you know what this header means, you can head over to Google PageSpeed insights and start using it without having any difficulties.