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Sponsored https://www.slayed.com/ SLAYED: High-End 4K Videos Featuring Beautiful Women Together Watch unforgettable connections between stunning women in premium cinematic scenes. SLAYED delivers sensual all-female experiences and breathtaking 4K visuals... https://daniel.haxx.se/blog/2026/03/21/bye-bye-rtmp/ bye bye RTMP | daniel.haxx.se In May 2010 we merged support for the RTMP protocol suite into curl, in our desire to support the world's internet transfer protocols. RTMP The protocol is an... daniel haxx sebyertmp https://daniel.haxx.se/blog/2019/12/18/internetmuseum/ Internetmuseum | daniel.haxx.se daniel haxx seinternetmuseum Sponsored https://www.xlovecam.com/ Athletic Girls - Xlovecam Chat with hundreds of English and foreign Sexy WebCam Girls, Discover their Live Cam XXX Show for Free, Without Registration and in HD quality at XloveCam... https://daniel.haxx.se/blog/2025/02/03/european-open-source-achievement-award/ European Open Source Achievement Award | daniel.haxx.se I have been awarded the European Open Source Achievement Award! Proud, happy and humble I decided to accept it, as well as the associated nomination for... daniel haxx seeuropean open https://daniel.haxx.se/blog/2025/11/05/curl-8-17-0/ curl 8.17.0 | daniel.haxx.se daniel haxx securl https://daniel.haxx.se/blog/2021/04/19/mars-2020-helicopter-contributor/ Mars 2020 Helicopter Contributor | daniel.haxx.se daniel haxx semarshelicopter https://daniel.haxx.se/blog/2019/01/21/quic-and-missing-apis/ QUIC and missing APIs | daniel.haxx.se daniel haxx sequicmissingapis https://daniel.haxx.se/blog/2025/10/22/aixcc-curl-details/ AIxCC curl details | daniel.haxx.se 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... daniel haxx seaixcccurl https://daniel.haxx.se/blog/2025/10/01/how-i-maintain-release-notes-for-curl/ How I maintain release notes for curl | daniel.haxx.se I believe a good product needs clear and thorough documentation. I think shipping a quality product requires you to provide detailed and informative release... curl daniel haxxrelease notes https://daniel.haxx.se/blog/2023/11/01/mastering-libcurl/ mastering libcurl | daniel.haxx.se On November 16 2023, I will do a multi-hour tutorial video on how to use libcurl. How to master it. As a follow-up to my previous video class called mastering... libcurl daniel haxxmastering https://daniel.haxx.se/blog/2024/10/02/im-a-professional/ I’m a professional | daniel.haxx.se I received this email today. tldr; I am not selling my soul. From: Microsoft Subject: Congratulations on your Microsoft MVP award You’ve been accepted to the... daniel haxx seprofessional https://daniel.haxx.se/blog/2025/10/16/chart-which-host-which-protocol/ chart: which host, which protocol | daniel.haxx.se 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... daniel haxx sehost protocol https://daniel.haxx.se/blog/2023/05/24/polhemsradet/ Polhemsrådet | daniel.haxx.se daniel haxx se https://daniel.haxx.se/blog/2016/08/18/http2-connection-coalescing/ HTTP/2 connection coalescing | daniel.haxx.se Section 9.1.1 in RFC7540 explains how HTTP/2 clients can reuse connections. This is my lengthy way of explaining how this works in reality. Many connections in... daniel haxx sehttpconnection https://daniel.haxx.se/blog/2024/09/25/talk-keeping-the-world-from-burning/ Talk: Keeping the world from Burning | daniel.haxx.se On Monday this week, I did a talk at the Nordic Software Security Summit conference in Stockholm Sweden. I titled it CVEMITRECVSSNVDCNAOSS WTF with the... daniel haxx setalkkeeping https://daniel.haxx.se/blog/2025/11/13/parsing-integers-in-c/ Parsing integers in C | daniel.haxx.se In the standard libc API set there are multiple functions provided that do ASCII numbers to integer conversions. They are handy and easy to use, but also... daniel haxx separsingintegers https://daniel.haxx.se/blog/2026/02/25/curl-security-moves-again/ curl security moves again | daniel.haxx.se 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... daniel haxx securlsecurity https://daniel.haxx.se/blog/2026/03/26/dont-trust-verify/ Don’t trust, verify | daniel.haxx.se Software and digital security should rely on verification, rather than trust. I want to strongly encourage more users and consumers of software to verify curl.... daniel haxx setrust verify https://daniel.haxx.se/blog/2025/03/31/https-rr-in-curl/ HTTPS RR in curl | daniel.haxx.se RFC 9460 describes a DNS Resource Record (RR) named HTTPS. To highlight that it is exactly this DNS record called HTTPS we speak of, we try to always call it... curl daniel haxxhttpsrrse https://daniel.haxx.se/blog/2021/08/11/a-github-star/ A GitHub star | daniel.haxx.se daniel haxx segithubstar https://daniel.haxx.se/blog/2025/07/14/death-by-a-thousand-slops/ Death by a thousand slops | daniel.haxx.se I have previously blogged about the relatively new trend of AI slop in vulnerability reports submitted to curl and how it hurts and exhausts us. This trend... daniel haxx sedeaththousand Sponsored https://www.fanvue.com/lina-rose Lina Rose - Fanvue Baddest bitch on Fanvue. You have no idea what you've gotten yourself into. Only enter if you can handle me... https://daniel.haxx.se/blog/2021/09/15/curl-7-79-0-secure-local-cookies/ curl 7.79.0 – secure local cookies | daniel.haxx.se daniel haxxcurlsecurelocal Sponsored https://www.erito.com/ Erito Checkout the official Spicevids pornsite featuring top rated Asian pornstars in HD XXX videos. https://daniel.haxx.se/blog/2025/08/15/car-brands-running-curl/ car brands running curl | daniel.haxx.se Seven years ago I wrote about how a hundred million cars were running curl and as I brought up this blog post in a discussion recently, I came to reflect over... curl daniel haxxcar brandsse https://daniel.haxx.se/blog/2025/02/16/openssl-does-a-quic-api/ OpenSSL does a QUIC API | daniel.haxx.se But will it satisfy the world? I have blogged several times in the past about how OpenSSL decided to not ship the API for QUIC a long time ago, even though the... daniel haxx sequic apiopenssl https://daniel.haxx.se/blog/2024/06/10/http-3-in-curl-mid-2024/ HTTP/3 in curl mid 2024 | daniel.haxx.se daniel haxx sehttpcurlmid https://daniel.haxx.se/blog/2024/05/24/google-peer-bonus-number-five/ Google Peer Bonus number five | daniel.haxx.se It is not quite a gold medal, but it is now the fifth time I have the honor of receiving a Google Open Source Peer Bonus. I might soon start to think I have... daniel haxx senumber fivepeer https://daniel.haxx.se/blog/ daniel.haxx.se | curl, open source and networking curl, open source and networking daniel haxx seopen sourcecurl https://daniel.haxx.se/blog/2021/10/25/the-quic-api-openssl-will-not-provide/ The QUIC API OpenSSL will not provide | daniel.haxx.se In a world that is now gradually adopting HTTP/3 (which, as you know, is implemented over QUIC), the problem with the missing API for QUIC is still a key... daniel haxx sequic apiopenssl https://daniel.haxx.se/blog/2016/12/01/2nd-best-in-sweden/ 2nd best in Sweden | daniel.haxx.se daniel haxx sebestsweden https://daniel.haxx.se/blog/2025/04/07/writing-c-for-curl/ Writing C for curl | daniel.haxx.se It is a somewhat common question to me: how do we write C in curl to make it safe and secure for billions of installations? Some precautions we take and... curl daniel haxxwritingse https://daniel.haxx.se/blog/2020/09/23/a-google-grant-for-libcurl-work/ a Google grant for libcurl work | daniel.haxx.se Earlier this year I was the recipient of a monetary Google patch grant with the expressed purpose of improving security in libcurl. This was an upfront payout... daniel haxx segoogle grant https://daniel.haxx.se/blog/2025/09/19/bye-bye-kerberos-ftp/ Bye bye Kerberos FTP | daniel.haxx.se 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... daniel haxx sebyekerberosftp https://daniel.haxx.se/blog/2025/01/16/presentation-curl-from-start-to-end/ Presentation: curl from start to end | daniel.haxx.se On Tuesday January 21st 2025, at 16:00 CET (15:00 UTC) I will do a presentation titled as per above. I have not done this one before. The talk will be a... daniel haxx sepresentationend https://daniel.haxx.se/blog/2024/01/02/the-i-in-llm-stands-for-intelligence/ The I in LLM stands for intelligence | daniel.haxx.se daniel haxx sellmstands Sponsored https://www.deeper.com/ DEEPER: Bold and Sensual 4K Experiences with a Kinky Twist DEEPER invites you into a world of passion, power, and sensual discovery. Explore elegant encounters with stunning women and light kink themes... https://daniel.haxx.se/blog/category/floss/curl/ cURL and libcurl | daniel.haxx.se curl and/or libcurl related libcurl daniel haxxse https://daniel.haxx.se/blog/2022/02/14/the-great-curl-roadmap-2022-webinar/ The great curl roadmap 2022 webinar | daniel.haxx.se daniel haxx segreatcurl https://daniel.haxx.se/blog/2019/03/20/happy-21st-curl/ Happy 21st, curl! | daniel.haxx.se Another year has passed. The curl project is now 21 years old. I think we can now say that it is a grown-up in most aspects. What have we accomplished in the... curl daniel haxxhappyse https://daniel.haxx.se/blog/2022/01/17/enforcing-the-pyramid-of-open-source/ Enforcing the pyramid of Open Source | daniel.haxx.se The well-known log4j security vulnerability of December 2021 triggered a lot of renewed discussions around software supply chain security, and sometimes it has... daniel haxx seopen source https://daniel.haxx.se/blog/2022/01/10/dont-mix-url-parsers/ Don’t mix URL parsers | daniel.haxx.se I have had my share of adventures with URL parsers and their differences in the past. The current state of my research on the topic of (failed) URL... daniel haxx seurl parsersmix https://daniel.haxx.se/blog/2025/09/13/developer-of-the-year/ Developer of the year | daniel.haxx.se 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... daniel haxx sedeveloperyear https://daniel.haxx.se/blog/2025/10/10/a-new-breed-of-analyzers/ A new breed of analyzers | daniel.haxx.se (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... daniel haxx senewbreed https://daniel.haxx.se/blog/2025/08/04/even-happier-eyeballs/ Even happier eyeballs | daniel.haxx.se Back in 2012, the Happy Eyeballs RFC 6555 was published. It details how a sensible Internet client should proceed when connecting to a server. It basically... daniel haxx seeven happier https://daniel.haxx.se/blog/2025/08/18/ai-slop-attacks-on-the-curl-project/ AI slop attacks on the curl project | daniel.haxx.se In August 16 2025 I did a keynote with this title on the FrOSCon conference in Bonn, Germany. The room held a few hundred seats and every single one was... daniel haxx seai slopattacks https://daniel.haxx.se/blog/2023/08/08/mastering-the-curl-command-line/ Mastering the curl command line | daniel.haxx.se For the first time ever, I am going to present a single, very long, video class with the title shown above. This session will be streamed and recorded live on... curl command linedaniel haxx Sponsored https://www.grannyhunter.com/ GrannyHunter https://daniel.haxx.se/blog/2025/11/04/yes-really-curl-is-still-developed/ Yes really, curl is still developed | daniel.haxx.se 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... daniel haxx seyes reallycurl https://daniel.haxx.se/blog/2020/08/05/upcoming-webinar-curl-how-to-make-your-first-code-contribution/ Upcoming Webinar: curl: How to Make Your First Code Contribution | daniel.haxx.se When: Aug 13, 2020 10:00 AM Pacific Time (US and Canada) (17:00 UTC)Length: 30 minutes Abstract: curl is a wildly popular and well-used open source tool and... upcoming webinarcurlmakefirst https://daniel.haxx.se/blog/2025/10/25/a-gold-ceremony-to-remember/ A gold ceremony to remember | daniel.haxx.se 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... daniel haxx segoldceremony https://daniel.haxx.se/blog/2022/11/25/89-operating-systems/ 89 operating systems | daniel.haxx.se daniel haxx seoperating https://daniel.haxx.se/blog/2026/03/22/ntlm-and-smb-go-opt-in/ NTLM and SMB go opt-in | daniel.haxx.se The NTLM authentication method was always a beast. It is a proprietary protocol designed by Microsoft which was reverse engineered a long time ago. That effort... daniel haxx sentlmsmbgoopt https://daniel.haxx.se/blog/2025/10/23/on-110-operating-systems/ On 110 operating systems | daniel.haxx.se 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... daniel haxx seoperating https://daniel.haxx.se/blog/author/daniel/ Daniel Stenberg | daniel.haxx.se daniel stenberghaxx se https://daniel.haxx.se/blog/tag/curl-and-libcurl/ cURL and libcurl | daniel.haxx.se curl, open source and networking libcurl daniel haxxse