greenbytes was founded in June 2000 as consulting and software development company with a heavy bias on technologies driving the Net.

Open Source

In 2015 we developed the implementation of the HTTP/2 protocol for the famous Apache HTTP Server, which is used in about half of the web sites on our planet. Initially sponsored by the GSMA, the implementation has been donated to the Apache Software Foundation and become part of the core product.

As a member of the Apache httpd project committee (PMC) we continue to work on improvements and features, especially in the exciting area of HTTP/2 and web performance.


During the last years we have been very active in various working groups in the "Applications Area" of the Internet Engineering Task Force (IETF): (→WebDAV )

  • The HTTP Working Group, which works on new the HTTP specifications. We contributed in updating the Basic Authentication Scheme, now RFC 7617, client initiated content encoding, Accept-Encoding and in reviewing work by others in this group.
  • The HTTPbis Working Group, which works on revising the HTTP specification. RFC 2616 (the latest specification of HTTP/1.1) was published in 1999, and since then, work on HTTP-based protocols such as WebDAV or AtomPub has revealed many areas where the original specification lacks precision, for instance by not taking read/write use cases or extension methods into account. Greenbytes supports this maintenance task heavily by contributing one of the new editors.
  • The WebDAV Working Group, which worked on several extensions to HTTP supporting distributed authoring of Web resources. We contributed to most of the specifications, and participated as authors on many of them. Nowadays, WebDAV clients are implemented in all modern operation systems, and few document management systems ship without WebDAV support.
  • The Atom Working Group, which specified both a robust replacement for the ambiguously defined RSS format, and an HTTP based authoring protocol for feeds. In the meantime, both specifications are used in many unforeseen places, which usually is an indication of smart protocol design.

Document Management

Our work in the Document Management space has also led us into other standardization efforts, such as the W3C HTML5 Working Group, the JSR-283 (Java Content Repository) Expert Group, and the OASIS Content Management Interoperability Services (CMIS) Technical Committee. If you're looking for experts in these areas, do not look further!

This expertise has been applied successfully into our customers' products and we took experience from those projects back into the standardization work. It is our belief that this way of working will generate the best standards and interoperable, excellent applications. (→customers )