daniel.haxx.se
daniel.haxx.se
Daniel Stenberg
I’m Daniel Stenberg, an internet protocol geek and developer of network related open source projects. I live and work in Sweden. daniel.haxx.se is my site and I post what I feel like.
Latest Posts
A lot! One of the most common reactions or questions I get about curl when I show up at conferences somewhere and do presentations: — is curl still being actively developed? How many more protocols can there be? This of course being...
There are those moments in life you know already from the start are going to be the rare once in a lifetime events. This evening was one of those times. On a dark and wet autumn Friday afternoon my entire family and me dressed up to the...
In November 2022, after I had been keeping track and adding names to this slide for a few years already, we could boast about curl having run on 89 different operating systems and only one year later we celebrated having reached 100...
At the AIxCC competition at DEF CON 33 earlier this year, teams competed against each other to find vulnerabilities in provided Open Source projects by using (their own) AI powered tools. An added challenge was that the teams were also...
The Royal Swedish Academy of Sciences (IVA, the same org that selects winners for three of the Nobel prize categories) awards me a gold medal 2025 for my work on curl. (English version of IVA article) This academy, established 1919 by...
A flow chart describing some steps and decisions done within curl when a HTTP URL is provided. For hostnames, protocol and port numbers. This flow chart ignores proxies, authentication considerations and use of unix domain sockets to...
(See how I cleverly did not mention AI in the title!) You know we have seen more than our fair share of slop reports sent to the curl project so it seems only fair that I also write something about the state of AI when we get to enjoy...
I believe a good product needs clear and thorough documentation. I think shipping a quality product requires you to provide detailed and informative release notes. I try to live up to this in the curl project, and this is how we do it....
As the Cyber Resilience Act (CRA) is getting closer and companies wanting to sell digital services in goods within the EU need to step up, tighten their procedures, improve their documentation and get control over their dependencies I...
We are dropping support for this feature in curl 8.17.0. Kerberos5 FTP to be exact. The last Kerberos support we had for FTP. Badness On September 16, 2025 we received a security report that accurately identified a possible stack based...
Every curl security report starts out with someone submitting an issue to us on https://hackerone.com/curl. The reporter tells us what they suspect and what they think the problem is. This report is kept private, visible only to the curl...
Developers Day is a recent annual Swedish gala organized by the Stockholm-based company Developers Bay. This is its third year running. They have an ambition to highlight and celebrate Swedish software developers (or perhaps it is...
Welcome to one of the more feature-packed curl releases we have had in a while. Exactly eight weeks since we shipped 8.15.0. Release presentation Numbers the 270th release17 changes56 days (total: 10,036)260 bugfixes (total: 12,538)453...
One of these mantras I keep repeating is how we in the curl project keep improving, keep polishing and keep tightening every bolt there is. No one can do everything right from day one, but given time and will we can over time get a lot...
This was the title of my keynote at the Open Source Summit Europe 2025 conference in Amsterdam that I delivered on August 25, 2025. The giants, as in fact large parts of modern infrastructure, stand on the shoulders of Open Source...