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
The annual curl users and developers meeting, curl up, takes place May 23-24 2026 in Prague, Czechia. We are in fact returning to the same city and the exact same venue as in 2025. We liked it so much! curl up This is a cozy and friendly...
tldr: curl goes back to Hackerone. When we announced the end of the curl bug-bounty at the end of January 2026, we simultaneously moved over and started accepting curl security reports on GitHub instead of its previous platform. This...
Last spring I wrote a blog post about our ongoing work in the background to gradually simplify the curl source code over time. This is a follow-up: a status update of what we have done since then and what comes next. In May 2025 I had...
The title of my ending keynote at FOSDEM February 1, 2026. As the last talk of the conference, at 17:00 on the Sunday lots of people had already left, and presumably a lot of the remaining people were quite tired and ready to call it a...
In January 2025 I received the European Open Source Achievement Award. The physical manifestation of that prize was a trophy made of translucent acrylic (or something similar). The blog post I above has a short video where I show it off....
I had the honor and pleasure to hand over this prize to its first real laureate during the award gala on Thursday evening in Brussels, Belgium. This annual award ceremony is one of the primary missions for the European Open Source...
We are doing another curl + distro online meeting this spring in what now has become an established annual tradition. A two-hour discussion, meeting, workshop for curl developers and curl distro maintainers. 2026 curl distro meeting...
We introduced curl’s -J option, also known as --remote-header-name back in February 2010. A decent amount of years ago. The option is used in combination with -O (--remote-name) when downloading data from a HTTP(S) server and instructs...
tldr: an attempt to reduce the terror reporting. There is no longer a curl bug-bounty program. It officially stops on January 31, 2026. After having had a few half-baked previous takes, in April 2019 we kicked off the first real curl...
One of the trickier things in software is gradual degradation. Development that happens in the wrong direction slowly over time which never triggers any alarms or upset users. Then one day you suddenly take a closer look at it and you...
Back in 2020 we added MQTT support to curl. When curl 8.19.0 ships in the beginning of March 2026, we have also added MQTTS; meaning MQTT done securely over TLS. This bumps the number of supported transfer protocols to 29 not too long...
Some of you may of course think what, only 20,000 commits after almost thirty years in the project, what kind of slacker is that guy? But yes, today I merged my 20,000th commit into the curl repository – out of a total of 37,604 commits...
In the curl project we have a long tradition of offering multiple optional backends for specific protocols. In this spirit we have added experimental support for a number of different HTTP/3 + QUIC backends over time. A while ago we...
Download curl from curl.se! Release presentation Numbers the 272nd release5 changes63 days (total: 10,155)391 bugfixes (total: 13,376)758 commits (total: 37,486)0 new public libcurl function (total: 100)0 new curl_easy_setopt() option...
I am heading to FOSDEM again at the end of January. I go there every year and I have learned that there is a really sticker-happy audience there. The last few times I have been there, I have given away several thousands of curl stickers....