How do server headers work?
When you visit a website, your web browser sends a request to the server hosting the website. The server then responds with an HTTP response. It consists of a set of header lines, the so-called HTTP headers, and usually a body such as an HTML file. The headers are sent before the actual content. One of these headers is the server header, which provides the browser with information about the server itself and the software it is using. The information in the server header can be very useful. For example, based on this information, it is possible to determine what type of server software the host is using, what operating system is running, and whether the server may be vulnerable to certain types of attacks.
Why are server headers important?
Server headers are important for various reasons. For one, they play a role in website security. A server header with a detailed version number (for example “Apache/2.4.1 (Unix)”) can give attackers clues as to whether the server is vulnerable to known security flaws. It is therefore advisable to hide the version information, for example with “ServerTokens Prod” on the Apache web server or “server_tokens off” on nginx. Keeping the server software up to date remains more important, however.
What information is included in the server header?
The information included in the server header can vary depending on the server and configuration. However, it typically contains basic information such as the name and version of the server software as well as the name of the operating system. In some cases, the server header may also contain additional information, such as the name of the hosting company.
How can I check the server header of my website?
If you want to check your website to see what information is included in the server header, there are various tools you can use. One way is to open your browser’s developer tools and switch to the “Network” tab. Here, you can send a request to your website and view the server’s response, including the server header.
If you have questions regarding server headers or need assistance with web server configuration, feel free to send us a message or call us on: +49 228 243 313 53
