Documentation and ramblings of Daniel Stenberg, founder and lead developer of curl.
Visit daniel.haxx.se → On Hacker News Dec 2010 – Aug 2026
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The protocol that's been called HTTP-over-QUIC for quite some time has now changed name and will officially become HTTP/3. This was triggered by this original suggestion by Mark Nottingham. The QUIC Working Group in the IETF works on creating the QUIC transport protocol. QUIC is a TCP replacement done over UDP…
DNS over HTTPS (DOH) is a feature where a client shortcuts the standard native resolver and instead asks a dedicated DOH server to resolve names. Compared to regular unprotected DNS lookups done over UDP or TCP, DOH increases privacy, security and sometimes even performance. It also makes it easy to use a name server…
There is again a pull-request submitted to the curl project to bring support for the Gemini protocol. It seems like a worthwhile effort that I support, even if it is also a lot of work involved and it might take some time before it reaches the state in which it can be merged. A previous … Continue reading The Gemini…
My name and email address can be found in the VPN client application made by Cisco called AnyConnect. They are present there as part of the curl license, because this product - like thousands of others - uses libcurl. My name appears in many products. Apparently, people often have problems finding an appropriate…
When I started the precursor to the curl project, httpget, back in 1996, I wrote my first URL parser. Back then, the universal address was still called URL: Uniform Resource Locators. That spec was published by the IETF in 1994. The term "URL" was then used as source for inspiration when naming the tool and … Continue…
IDN, International Domain Names, is the concept that lets us register and use international characters in domain names, and by international we of course mean characters outside of the ASCII range. Recently I have fought some battles against IDN and IDN decoding so I felt this urge to write a lot of words about it ……
In this little piece I'll explain why there won't be any version 8 of curl and libcurl in a long time. I won't rule out that it might happen at some point in the future. Just that it won't happen anytime soon and explain the reasons why. Seven point twenty nine, really? We've done 29 … Continue reading Why no curl 8 →
The InterPlanetary File System (IPFS) is according to the Wikipedia description: "a protocol, hypermedia and file sharing peer-to-peer network for storing and sharing data in a distributed file system.". It works a little like bittorrent and you typically access content on it using a very long hash in an ipfs:// URL…
Everyone knows that on most systems you can specify IPv4 addresses just 4 decimal numbers separated with periods (dots). Example: 192.168.0.1 Useful when you for example want to ping your local wifi router and similar. "ping 192.168.0.1" Other bases The IPv4 string is usually parsed by the inet_addr() function or at…
Pádraig Brady taught me a great trick in a comment to a previous blog post and it was so neat I feel a need to highlight it further as it also makes it easier for me to find it again later! To simulate a far away server, add RTT time to the localhost device. For … Continue reading Add latency to localhost →
At around 06:49 CEST on the morning of August 27 2014, Google deployed an HTTP/2 draft-14 implementation on their front-end servers that handle logins to Google accounts (and possibly others). Those at least take care of all the various login stuff you do with Google, G+, gmail, etc. The little problem with that was…
I attended a TCP/IP Geeks Stockholm meetup yesterday and did a talk about HTTP/2. Below is the slide set, but as usual it might not be entirely self explanatory... HTTP/2 - for TCP/IP Geeks Stockholm from Daniel Stenberg
$ curl ‐‐http2 https://daniel.haxx.se/ curl: (1) Unsupported protocol curl on mac curl has been shipped by default on Mac OS X since many years - I actually couldn't even manage to figure out exactly how many. It is built and bundled with the operating system by Apple itself and on Apple's own terms and even ……