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Unlikely server bannersĪmongst the 1.2 billion websites, there are plenty of examples of unlikely server banners. Sometimes this is done in a deliberate attempt to cloak the truth or to mislead, while in others it may simply be done as a joke waiting to be found by anyone curious enough to look for the banner. Of course, with this amount of flexibility, a cheeky or malicious administrator can configure a web server to pretend to be anything they want.

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Our Web Server Survey includes a few websites that return the following Server header, which takes a deliberate swipe at the effectiveness of hiding this sort of information: A common reason for changing the default value is to reduce the amount of information that would be revealed to an attacker.įor example, if a web server advertises itself as running a vulnerable version of Apache, such as “ Apache/2.4.49” it could be more likely to come under attack than a server that reveals only “ Apache”. Web server software usually allows its server banner to be modified.

This string is not ordinarily exposed to users, but most browsers allow it to be viewed in the Network Inspector panel. It does not reveal a version number.Ī web server reveals its server banner via the Server HTTP response header. One such example is “ Apache/2.2.32 (Unix) mod_ssl/2.2.32 OpenSSL/1.0.2k-fips DAV/2 PHP/5.5.38”.Ĭhrome’s Network Inspector showing the HTTP response headers for, which uses the nginx web server. Many of these server banners are simply short strings like “ Apache”, while others may include additional details that reveal which other software – and which versions – are installed on the server. Most of these sites return a server banner that shows which web server software they use, thus allowing us to determine the market shares of each server vendor since 1995. Netcraft’s most recent Web Server Survey includes nearly 1.2 billion websites.