The internet's hidden humour
In comments, protocol header information and in various other places you can find suprisingly funny things, which nobody really sees unless you start searching for it. But you really need to look closely to actually find it.
Humour is not quite a universal thing. Some people find something hilarious while other find the same thing offending, stupid or childish. But humour is important. It loosens our daily lifes up or can take the awkwardness out of uncomfortable situations. In this short post, we will look at humour (mostly geekish humour) that is all over the internet, but which is invisible to most internet users as it is hidden from plain sight.
The meowing duck
The meowing duck is probably the most widely received humorous picture on the planet. But it has been seen by very few people that actually have received it. The reason why it has been received by so many people is that Amazon is sending the duck to eveybody visiting their website. That would be about two billion ducks per month by Amazon.com alone:
So many ducks!
Maybe at this point you wonder where this duck can be found and how it looks like. The duck is hidden in the HTML source of the website where it is embedded at the very end in form of a comment (so the browser does not display it):
<!-- _ .__(.)< (MEOW) \___) ~~~~~~~~~~~~~~~~~~-->
If you don’t believe it, you can look at the site’s HTML source inside your browser. You can also look at it on the command line. Just open a shell and type:
curl https://www.amazon.com --compressed --user-agent "Chromium/Mozilla 5.0"
The website should fly by on the terminal. At the end however, you should see the duck in front of you, as it is at the end of the HTML page.
Quotes of geek literature
There are quite a number of real classics amongst geek literature. Douglas Adams’ “The Hitchhiker’s Guide to the Galaxy” e.g. or Terry Pratchett’s “Discworld” series are certainly at the top of that list. Most geeks therefore know at least a couple of quotes from these classics. It is therefore not surprising, that constantly, a number of these are transmitted invisibly to the common internet user. This time, they are not found in the HTML source of web pages but in control information of the protocol that is used to transfer those pages: the Hypertext Transfer Protocol (HTTP).
Within HTTP, there are no comments. HTTP however contains a number of HTTP headers,
one per line, which start with a keyword, followed by a semi-colon, followed by
a value. In the example with the meowing duck using
curl we actually set one
of those headers: the
User-Agent, so that Amazon believed the request came
from a proper browser. The problem is, the HTTP standard is evolving and new
headers are being defined. So when you add headers, that are not part of the standard
now, they might be in the future. In order to avoid such future header name collisions,
you can add your own, proprietary headers, starting with
X-. This will not be used
in standard headers, so future collisions can be avoided and people can add anything
they like as long as it starts with
X-. However, RFC 7231 - part of the HTTP specification - has this to say about this still common
Authors of specifications defining new fields are advised to keep the name as short as practical and not to prefix the name with "X-" unless the header field will never be used on the Internet. (The "X-" prefix idiom has been extensively misused in practice; it was intended to only be used as a mechanism for avoiding name collisions inside proprietary software or intranet processing, since the prefix would ensure that private names never collide with a newly registered Internet name; see [BCP178] for further information).
Let’s ignore the fact for now, that these headers are not to be used on the
public internet and let’s see if there is a humoristic side to them. Of all
webservers, the German Heise publishing house, responsible for popular IT
magazines such as c’t and iX and a popular news site on IT topics is using these
headers for an hommage to geek literature. Let’s use curl again to inspect the
HTTP headers used when requesting
heise.de (careful, do not use
curl -I http://heise.de
This is the result:
HTTP/1.1 301 Moved Permanently Date: Sun, 15 Mar 2020 13:49:03 GMT Server: Apache X-Cobbler: servo65.heise.de X-Pect: The Spanish Inquisition X-Clacks-Overhead: GNU Terry Pratchett X-42: DON'T PANIC Location: https://www.heise.de/ Connection: close Content-Type: text/html; charset=iso-8859-1
Four headers start with the
X- prefix. Real geeks instantly know at least some
of the references hidden inside. For all the rest of you, this is what’s inside:
Douglas Adams was already mentioned.
X-42: DON'T PANIC refers to two well-known
passages of his “The Hitchhiker’s Guide to the Galaxy”. 42 is the answer to the
“ultimate question of life, the universe, and everything”, which a super computer
came up with, that was purpose-built just for answering that question. It is probably
the best known jewel from his book series. “Don’t panic” is written on the cover
of the book “The Hitchhiker’s Guide to the Galaxy” as it is described in the book
itself. Fans of Douglas Adams celebrate the Towel Day every year on the 25th of May. Please remember to always bring a towel.
X-Clacks-Overhead: GNU Terry Pratchett even has its own
website, which not only explains its meaning
but also contains instructions to make your webserver deliver that paticular header.
There even is an impressively long, and yet incomplete,
list of servers, that are already
configured to send that header.
The Clacks BTW, are a network of signal towers
GNU in this case is not the recursive acronym for
GNU’s Not Unix, but a
control sequence (just like an internet protocol header), that will control how
the following message is being send (in this case
Terry Pratchett). What it will
do is, it makes sure that the message is sent on and repeated forever, so that
it will never disappear from the network.
X-Pect: The Spanish Inquisition is a reference to an old Monty Python sketch.
X-Pect is a play on words in itself, because in the sketch the
Nobody expects the Spanish Inquisition.
X-Cobbler: servo65.heise.de and I have to admit, that I need to give
up on this one. There you have it. Obviously my geek knowledge is pretty limited.
If you have more hidden internet humour (but it really has to be pretty well
hidden), or if you can reveal what’s behind
X-Cobbler, just reach out to me under: