HTTP Headers For Fun & Profit(loopj.com)
loopj.com
HTTP Headers For Fun & Profit
http://loopj.com/2012/12/07/http-headers-for-fun-and-profit/
52 comments
curl -I www.reddit.com
Haha, brilliant!
I don't get it - What am I missing?
Server: '; DROP TABLE servertypes; --
Am i getting too old? When I see "for fun and profit" I don't think I'm going to read about some easter eggs hiding in http headers.
No, you're not. That headline was abusing that time-honored tradition.
My favorite is Zappos.com
% curl -I www.zappos.com
HTTP/1.1 200 OK
Server: nginx/1.1.17
Content-Type: text/html; charset=utf-8
X-ZFC-Metadata: KiMIExILCgNuaWQSBDU5NjQSEgoGbGF5b3V0Eghob21lcGFnZQ==
X-Powered-By: Ponies!
X-Varnish-TTL: 60m
X-Varnish: 251047185 251045936
X-Cache-Hits: 87
X-Varnish-Host: varnish04.zappos.net
X-Varnish-ID: drupal
X-Core-Value: 1. Deliver WOW Through Service
X-Recruiting: If you're reading this, maybe you should be working at Zappos instead. Check out jobs.zappos.com
X-UUID: ecbb72d2-40c0-11e2-b1b3-0010184bda34
Cache-Control: max-age=2004
Date: Fri, 07 Dec 2012 23:19:43 GMT
Connection: keep-alive
There's also a lot of fun robots.txt. I forget where it was mentioned (I didn't find it myself) but this one always made me laugh:
# robots.txt for http://www.palm.com/ modified 7/28/09
User-agent: Vampires
Disallow: /neckFrom reddit.com:
User-Agent: bender
Disallow: /my_shiny_metal_ass
User-Agent: Gort
Disallow: /earthBetter still: http://www.last.fm/robots.txt
Disallow: /harming/humans
Disallow: /ignoring/human/orders
Disallow: /harm/to/selfOMFG. That is hilarious!
Made my day
Made my day
Brilliant!
Here is a blog post with some classic HTTP headers (2005):
http://www.nextthing.org/archives/2005/08/07/fun-with-http-h...
The cool thing is that the approach to find these unusual headers was pretty systematic.
The cool thing is that the approach to find these unusual headers was pretty systematic.
What the hell is going on with those expand-on-hover boxes that you need to move your mouse to see? Who thought that was a good idea?
Agreed. It took me about 30 seconds to work out how to view the content (so long I nearly gave up and closed the page.
The problem I had was that I couldn't scroll. I ended up having to maximize my browser (Opera) to read them as every time I move my mouse to the scroll bar, they'd shrink again (same problem with using the mouse scroll wheel).
I can't image trying to read those boxes on a tablet where I don't even have a cursor to hover.
The problem I had was that I couldn't scroll. I ended up having to maximize my browser (Opera) to read them as every time I move my mouse to the scroll bar, they'd shrink again (same problem with using the mouse scroll wheel).
I can't image trying to read those boxes on a tablet where I don't even have a cursor to hover.
I tried on my Android. If you click on the boxen they embiggen. It's not much better than having to mouseover.
Why don't they just break and add a new line? These are really annoying.
Interestingly IETF discourages the use of X prefixed headers but they might still suite this kind of behavior http://tools.ietf.org/html/rfc6648
I'm sorry if this is obvious. What does the verb "to suite" mean?
*I'm not trying to be pedantic, genuinely curious if it is a word I do not know.
*I'm not trying to be pedantic, genuinely curious if it is a word I do not know.
I think "suit" was intended.
It's a very recent RFC from June 2012.
It was promoted from Draft with great celerity. I think they'd like it if folk stopped using X- sort of nowish.
Edit: on second thoughts, it's the IETF, they always move quick. And it's not as though this was a particularly thorny protocol or anything.
Edit: on second thoughts, it's the IETF, they always move quick. And it's not as though this was a particularly thorny protocol or anything.
I have a RESTful Symfony2 bundle that sends an X-Men header with a random X-Person from the comic books:
https://github.com/brightmarch/BrightmarchRestfulBundle/blob...
https://github.com/brightmarch/BrightmarchRestfulBundle/blob...
Is this not a terrible waste of bandwidth though ? At about 10 bytes per header (on the low end..) and say 100 million requests per day, that amounts to 1Gb of outbound bandwidth, if you count inbound bandwidth then that comes to 2gb in total. Not to mention the cumulative time spent by users downloading those bytes, thereby delaying resource display.
Okay, I see that I sucked the fun out of it :P
Okay, I see that I sucked the fun out of it :P
Yeah it is a waste, but then so is sending CSS and Javascript that hasn't been minified. Or having multiple CSS / Javascript files when they could be consolidated. Or having long variable / class names in CSS / Javascript. Or constantly referring to Javascript as Javascript and not JS.
At some point you have to question whether you're being too stingy with bandwidth. Particularly when easter eggs like this could potentially bring you a few new visitors from the free advertising that happens when your site is discussed on blogs and forums like these.
But if nothing else; I think fun should be encouraged. After all, that's what Wozniak set out to do when he co-founded Apple :P
At some point you have to question whether you're being too stingy with bandwidth. Particularly when easter eggs like this could potentially bring you a few new visitors from the free advertising that happens when your site is discussed on blogs and forums like these.
But if nothing else; I think fun should be encouraged. After all, that's what Wozniak set out to do when he co-founded Apple :P
I wouldn't say a terrible waste of bandwidth given the novelty trade off it provides to people like us.
Besides, there's more wasted bandwidth from dubious user generated content per second floating around the internet at any second.
If you have 100 million requests per day, then you definitely have bigger problems such as your monthly CDN bill. :)
Besides, there's more wasted bandwidth from dubious user generated content per second floating around the internet at any second.
If you have 100 million requests per day, then you definitely have bigger problems such as your monthly CDN bill. :)
How many software engineers do you need to recruit via your http headers to offset the bandwidth costs?
pinterest.com seems to download ~700kB. Adding amusing http headers seems negligible.
pinterest.com seems to download ~700kB. Adding amusing http headers seems negligible.
1994 called, they want their bandwidth back! :)
curl -I www.pinboard.in
HTTP/1.1 200 OK
Vary: Accept-Encoding
Content-Type: text/html; charset=utf8
Connection: keep-alive
Server: You got SERVED!
X-Cache: MISSOnly one I know that hasn't been mentioned:
http://www.seomoz.org/
http://www.seomoz.org/
X-Recruiting: If you're reading this, maybe you should be working at SEOmoz instead. Check out www.seomoz.org/about/jobsI want to say this was copied/ inspired by Automattic's
I know Wordpress.org sends a header called X-Hacker or something, telling people who see the header to look at their jobs page and tell them about the header.
# curl -I http://automattic.com
HTTP/1.1 200 OK
Server: nginx
Date: Fri, 07 Dec 2012 12:53:44 GMT
Content-Type: text/html; charset=UTF-8
Connection: keep-alive
Vary: Accept-Encoding
Last-Modified: Fri, 07 Dec 2012 12:51:57 GMT
Cache-Control: max-age=193, must-revalidate
X-nananana: Batcache
Vary: Cookie
X-hacker: If you're reading this, you should visit automattic.com/jobs and apply to join the fun, mention this header.
X-Pingback: http://automattic.com/xmlrpc.php
Link: <http://wp.me/Pe4R-am2>; rel=shortlinkIt's not that hard to check and it seems they don't. But they have this other X-nc header:
$ curl -I wordpress.org
HTTP/1.1 200 OK
Server: nginx
Date: Fri, 07 Dec 2012 12:15:43 GMT
Content-Type: text/html; charset=utf-8
Connection: close
Vary: Accept-Encoding
X-nc: HIT luv 139I set this one up a while ago. The header is on most of our sites.
curl -I webmaster.appstate.edu
curl -I webmaster.appstate.edu
X-Robot-3: Which of the following would you most prefer? A: a puppy, B: a pretty flower from your sweetie, or C: a large properly formatted data file?curl -I https://www.instapaper.com/api/1/bookmarks/list
X-Powered-By: a lot of coffee and Phishcurl -I https://localsense.com/
HTTP/1.1 200 OK
x-powered-by: blood, sweat, and tears.Slashdot used to have Futurama quotes in their (X-Bender and X-Fry iirc). Don't seem to any more however.
Another great place for job adverts is deep inside your minified JS code or binary packages.
I'm a bit disappointed there are no fun headers on xkcd :/
> X-mas: Almost there.