June 2015 Web Server Survey

In the June 2015 survey we received responses from 863,105,652 sites and 5,346,650 web-facing computers, representing an increase of 5.2 million websites and 65,000 additional computers.

Microsoft was responsible for the majority of this month's hostname growth, with a gain of 6.6 million sites, but only contributed 11,700 additional web-facing computers. This has caused Microsoft's market share by hostnames to overtake its declining market share by computers, with both standing at just under 30%.

Apache led this month's web-facing computer growth with a net gain of 24,800, while nginx followed closely with 22,800. This has resulted in nginx's market share increasing by 0.28 to 12.4%, and despite showing the largest net growth, Apache's share fell slightly.

Apache, Microsoft and nginx together account for more than 88% of all web-facing computers in the world, making these vendors by far the most popular choices. However, nginx is the only vendor experiencing consistent increases in market share, up by 3 percentage points over the last year while both Apache and Microsoft have seen losses. The next most commonly used server is lighttpd (pronounced "lighty"), which is used by a mere 0.46% of web-facing computers.

nginx's market share has also been steadily increasing within the top million websites. Its share now stands at 21.9%, and although Apache's use within the million busiest sites has been steadily declining this decade, Apache looks likely to retain the lead for at least a few more years.

Three months after the death of Sir Terry Pratchett, approximately 84,000 websites are now serving the X-Clacks-Overhead: GNU Terry Pratchett header in tribute. Invisible to the majority of users, this HTTP header is a reference to the Discworld novel Going Postal, which features a series of communication towers called the clacks.

In the book, a similar header ("GNU John Dearheart"), is transmitted around the clacks after the inventor's son is killed in an accident while working on a clacks tower. The G means send the message on, N means do not log the message, and U means turn the message around at the end of the line and send it back again — this ensures that the message is transmitted indefinitely, allowing his son to be memorialised forever. Similarly, by transmitting Pratchett's name around the internet, the sites participating in this HTTP header tribute hope to keep his legacy alive. After all, as it says in the book, "A man is not dead while his name is still spoken."

One of the most popular sites to use the X-Clacks-Overhead: GNU Terry Pratchett header is www.theguardian.com, which alone reached more than 5 million unique browsers per day in 2014. With each header taking up 40 bytes of an uncompressed HTTP request, all of the sites involved in the tribute could be generating terrabytes of additional bandwidth usage every day.

Total number of websites

Web server market share

DeveloperMay 2015PercentJune 2015PercentChange
Apache336,813,95939.26%334,731,03538.78%-0.48
Microsoft247,784,66828.88%254,408,17929.48%0.59
nginx123,697,64514.42%122,965,52214.25%-0.17
Google20,103,0682.34%20,130,7322.33%-0.01
Web server market share for active sites

DeveloperMay 2015PercentJune 2015PercentChange
Apache89,387,11450.98%88,433,58649.53%-1.46
nginx24,204,57213.81%24,135,46313.52%-0.29
Microsoft18,984,65410.83%21,996,75412.32%1.49
Google13,931,2387.95%13,788,0127.72%-0.22

For more information see Active Sites

Web server market share for top million busiest sites

DeveloperMay 2015PercentJune 2015PercentChange
Apache488,31348.83%485,31548.53%-0.30
nginx216,43321.64%218,91321.89%0.25
Microsoft121,27412.13%120,23912.02%-0.10
Google24,1702.42%23,7512.38%-0.04
Web server market share for computers

DeveloperMay 2015PercentJune 2015PercentChange
Apache2,468,71246.74%2,493,54646.64%-0.10
Microsoft1,556,71329.47%1,568,37929.33%-0.14
nginx640,02812.12%662,81812.40%0.28