May the source be with you, but remember the KISS principle ;-)
Home Switchboard Unix Administration Red Hat TCP/IP Networks Neoliberalism Toxic Managers
(slightly skeptical) Educational society promoting "Back to basics" movement against IT overcomplexity and  bastardization of classic Unix

Broken or undebugged robots

News Perl HTTP Logs Processing Scripts .htaccess file  AWStats Apache Webserver  HTTP Return Codes  mod rewrite
Requests for non-existing web pages Referrer Spam PHP probes Requests for crossdomain.xml and other XML files Mystery GET requests with URI scheme encoded PNG image in them Lower case requests Trailing junk in requests
Bangers Bots that cause consistent 500 errors Broken or undebugged robots Requests for crossdomain.xml and other XML files Frivolous POSTs Non-PHP Web probes  
Probes from Fighting rogue robots Bots that couse consistent 500 errors Large Sample of "Composition URL" fake hits      
HTTP Protocol Apache authentication and authorization using LDAP Cheap Web hosting with SSH access Web site monitoring Sysadmin Horror Stories Web Humor Etc

see also Bangers

You can't even imagine what crippled junk is browsing the Web those days. Undebugged would be a severe understatement. For example

[Tue Sep 18 14:47:07 2012] [error] [client] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer:
[Tue Sep 18 14:46:43 2012] [error] [client] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer:
[Tue Sep 18 13:30:08 2012] [error] [client] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer:
[Tue Sep 18 13:30:05 2012] [error] [client] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer:
[Tue Sep 18 13:30:01 2012] [error] [client] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer:
[Tue Sep 18 13:29:57 2012] [error] [client] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer:
[Tue Sep 18 13:29:53 2012] [error] [client] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer:
[Tue Sep 18 13:29:49 2012] [error] [client] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer:
[Tue Sep 18 13:29:45 2012] [error] [client] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer:
[Tue Sep 18 13:29:40 2012] [error] [client] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer:
[Tue Sep 18 13:29:37 2012] [error] [client] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer:
[Tue Sep 18 13:29:33 2012] [error] [client] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer:
[Tue Sep 18 13:29:25 2012] [error] [client] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer:
[Tue Sep 18 13:29:20 2012] [error] [client] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer:
[Tue Sep 18 13:29:16 2012] [error] [client] File does not exist: /home/softpano/public_html/Hardware/Peripherals/programmable_keyboards.shtm, referer:

This category included such cases as - - [01/Sep/2012:12:00:30 -0700] "GET /Bulletin/++++++++++++++++++++++++++++++++++++++++++++Result:+%E4%E0%ED%ED%FB%E9+%F1%E0%E9%F2+%ED%E5%E4%EE%F1%F2%F3%EF%E5%ED HTTP/1.0" 404 17716 "http://www.soft    %ED%E5%E4%EE%F1%F2%F3%EF%E5%ED" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.19 (KHTML, like Gecko    ) Chrome/18.0.1025.168 Safari/535.19"
47 - - [01/Sep/2012:12:01:08 -0700] "GET /Bulletin/++++++++++++++++++++++++++++++++++++++++++++Result:+%E4%E0%ED%ED%FB%E9+%F1%E0%E9%F2+%ED%E5%E4%EE%F1%F2%F3%EF%E5%ED HTTP/1.0" 404 17716 "http://www.sof    +%ED%E5%E4%EE%F1%F2%F3%EF%E5%ED" "Mozilla/5.0 (Windows NT 6.1; WOW64) AppleWebKit/535.19 (KHTML, like Geck    o) Chrome/18.0.1025.168 Safari/535.19" - - [31/Aug/2012:04:54:19 -0700] "GET /Tools//Fi...tutorial.shtml HTTP/1.1" 404 14970 "-" "Mozilla/5.0 (compatible; Baiduspider/2.0; +" - - [31/Aug/2012:16:29:40 -0700] "GET /History/dos HTTP/1.1" 404 15166 "-" "Mozilla/5.0 (compa    tible; Baiduspider/2.0; +"

Typically such requests are coming from servers with no DNS records


*** can't find Non-existent domain
But for some reason some come from respectable sources such and Ba or Yandex. Both are prone to submitting incomplete requests, especially files with no extension: - - [31/Aug/2012:15:55:51 -0700] "GET /Bookshelf/Nyhoff1999 HTTP/1.1" 404 17197 "-" "Mozilla/    5.0 (compatible; YandexBot/3.0; +"
But at least it uses servers with DNS records
,,, ,,, ,,,

Sometimes requests from reputable bots are outright strange. Here are several from Google: - - [02/May/2013:00:21:50 -0700] "GET /Skeptics/Political_skeptic/Fifth_column/Humor/index.shtml?id=184751176 HTTP/1.1" 403 82 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +" - - [02/May/2013:07:57:36 -0700] "GET /Scripting/Perlorama/Functions/sprintf.shtml?node=print HTTP/1.1" 403 82 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +" - - [02/May/2013:17:24:42 -0700] "GET /Internals/@ebt-raster;hf=0;pt=3543?filename=s1065x2.gif HTTP/1.1" 403 82 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +" - - [02/May/2013:17:26:28 -0700] "GET /Internals/@ebt-raster;hf=0;pt=3543?filename=s1065x3.gif HTTP/1.1" 403 82 "-" "Mozilla/5.0 (compatible; Googlebot/2.1; +"

In first two Google in its infinite wisdom used parameters such as "?id=184751176" or "?node=print". The last two look like a bug.

Some bots are definitely undebugged and can't traverse sites using relative links. For example they are unable to form correct absolute URL from relative reference.

Here is one example:

=== Hardware/Peripherals/Windows/Keyboard_and_mouse/AutoHotkey/index.shtml ===
+++ IP: Referer:

=== Hardware/Peripherals/Windows/Keyboard_and_mouse/keyboard_remapping.shtml ===
+++ IP: Referer:

=== Hardware/Peripherals/Windows/Keyboard_and_mouse/keyboard_shortcuts.shtml ===
+++ IP: Referer:

=== Hardware/Peripherals/Windows/Keyboard_and_mouse/keyloggers.shtml ===
+++ IP: Referer:

=== Hardware/Peripherals/Windows/Keyboard_and_mouse/mousekeys.shtml ===
+++ IP: Referer:
The other problem is incomplete file names, where part of a long file name was eaten off because of limitation of the buffer for URL or some other bug. 

Incomplete or mangled URLs

There are also semi-debugged spiders that mangle URLs. One example that I recently encounter is something that identifies itself as  360Spider. It systematically deletes underscore from the URLs with predictable results. - - [20/Aug/2012:07:10:43 -0700] "GET /Commercialunixes/AIX/security.shtml HTTP/1.1" 404 2 4859 "" "Mozilla/5.0 (Windows; U; Windows NT 5.1; zh-CN; rv: Gecko/20070312 Firefox/; 360Spider" - - [20/Aug/2012:07:10:43 -0700] "GET /DB/Oracle/connectiontooraclefromperlscripts.shtml H TTP/1.1" 404 24859 "" "Mozilla/5.0 ( Windows; U; Windows NT 5.1; zh-CN; rv: Gecko/20070312 Firefox/; 360Spider" - - [20/Aug/2012:07:10:44 -0700] "GET /Hardware/Peripherals/programmablekeyboards.shtml HT TP/1.1" 404 24859 "" "Mozilla/5.0 (Wi ndows; U; Windows NT 5.1; zh-CN; rv: Gecko/20070312 Firefox/; 360Spider"

But some bots operating under the cover of Google also suffer from this bug: - - [17/Sep/2012:18:26:05 -0700] "GET /Net/Application.../DHCP/solaris_dhcp.shtml HTTP/1.1" 404 17950 "-" "Mediapartners-Google" - - [17/Sep/2012:18:51:21 -0700] "GET /Social/Toxic HTTP/1.1" 404 17950 "-" "Mediapartners-Google" - - [17/Sep/2012:18:51:22 -0700] "GET /Social/Toxic HTTP/1.1" 404 17950 "-" "Mediapartners-Google"

This media partner requests looks to me like Google bar replicating the HTTP request submitted by user reporting it to Google (one more reason to deinstall Google bar ;-)

Recommended Links

Google matched content

Softpanorama Recommended

Top articles


Top articles



Internal links



Groupthink : Two Party System as Polyarchy : Corruption of Regulators : Bureaucracies : Understanding Micromanagers and Control Freaks : Toxic Managers :   Harvard Mafia : Diplomatic Communication : Surviving a Bad Performance Review : Insufficient Retirement Funds as Immanent Problem of Neoliberal Regime : PseudoScience : Who Rules America : Neoliberalism  : The Iron Law of Oligarchy : Libertarian Philosophy


War and Peace : Skeptical Finance : John Kenneth Galbraith :Talleyrand : Oscar Wilde : Otto Von Bismarck : Keynes : George Carlin : Skeptics : Propaganda  : SE quotes : Language Design and Programming Quotes : Random IT-related quotesSomerset Maugham : Marcus Aurelius : Kurt Vonnegut : Eric Hoffer : Winston Churchill : Napoleon Bonaparte : Ambrose BierceBernard Shaw : Mark Twain Quotes


Vol 25, No.12 (December, 2013) Rational Fools vs. Efficient Crooks The efficient markets hypothesis : Political Skeptic Bulletin, 2013 : Unemployment Bulletin, 2010 :  Vol 23, No.10 (October, 2011) An observation about corporate security departments : Slightly Skeptical Euromaydan Chronicles, June 2014 : Greenspan legacy bulletin, 2008 : Vol 25, No.10 (October, 2013) Cryptolocker Trojan (Win32/Crilock.A) : Vol 25, No.08 (August, 2013) Cloud providers as intelligence collection hubs : Financial Humor Bulletin, 2010 : Inequality Bulletin, 2009 : Financial Humor Bulletin, 2008 : Copyleft Problems Bulletin, 2004 : Financial Humor Bulletin, 2011 : Energy Bulletin, 2010 : Malware Protection Bulletin, 2010 : Vol 26, No.1 (January, 2013) Object-Oriented Cult : Political Skeptic Bulletin, 2011 : Vol 23, No.11 (November, 2011) Softpanorama classification of sysadmin horror stories : Vol 25, No.05 (May, 2013) Corporate bullshit as a communication method  : Vol 25, No.06 (June, 2013) A Note on the Relationship of Brooks Law and Conway Law


Fifty glorious years (1950-2000): the triumph of the US computer engineering : Donald Knuth : TAoCP and its Influence of Computer Science : Richard Stallman : Linus Torvalds  : Larry Wall  : John K. Ousterhout : CTSS : Multix OS Unix History : Unix shell history : VI editor : History of pipes concept : Solaris : MS DOSProgramming Languages History : PL/1 : Simula 67 : C : History of GCC developmentScripting Languages : Perl history   : OS History : Mail : DNS : SSH : CPU Instruction Sets : SPARC systems 1987-2006 : Norton Commander : Norton Utilities : Norton Ghost : Frontpage history : Malware Defense History : GNU Screen : OSS early history

Classic books:

The Peter Principle : Parkinson Law : 1984 : The Mythical Man-MonthHow to Solve It by George Polya : The Art of Computer Programming : The Elements of Programming Style : The Unix Haterís Handbook : The Jargon file : The True Believer : Programming Pearls : The Good Soldier Svejk : The Power Elite

Most popular humor pages:

Manifest of the Softpanorama IT Slacker Society : Ten Commandments of the IT Slackers Society : Computer Humor Collection : BSD Logo Story : The Cuckoo's Egg : IT Slang : C++ Humor : ARE YOU A BBS ADDICT? : The Perl Purity Test : Object oriented programmers of all nations : Financial Humor : Financial Humor Bulletin, 2008 : Financial Humor Bulletin, 2010 : The Most Comprehensive Collection of Editor-related Humor : Programming Language Humor : Goldman Sachs related humor : Greenspan humor : C Humor : Scripting Humor : Real Programmers Humor : Web Humor : GPL-related Humor : OFM Humor : Politically Incorrect Humor : IDS Humor : "Linux Sucks" Humor : Russian Musical Humor : Best Russian Programmer Humor : Microsoft plans to buy Catholic Church : Richard Stallman Related Humor : Admin Humor : Perl-related Humor : Linus Torvalds Related humor : PseudoScience Related Humor : Networking Humor : Shell Humor : Financial Humor Bulletin, 2011 : Financial Humor Bulletin, 2012 : Financial Humor Bulletin, 2013 : Java Humor : Software Engineering Humor : Sun Solaris Related Humor : Education Humor : IBM Humor : Assembler-related Humor : VIM Humor : Computer Viruses Humor : Bright tomorrow is rescheduled to a day after tomorrow : Classic Computer Humor

The Last but not Least Technology is dominated by two types of people: those who understand what they do not manage and those who manage what they do not understand ~Archibald Putt. Ph.D

Copyright © 1996-2021 by Softpanorama Society. was initially created as a service to the (now defunct) UN Sustainable Development Networking Programme (SDNP) without any remuneration. This document is an industrial compilation designed and created exclusively for educational use and is distributed under the Softpanorama Content License. Original materials copyright belong to respective owners. Quotes are made for educational purposes only in compliance with the fair use doctrine.

FAIR USE NOTICE This site contains copyrighted material the use of which has not always been specifically authorized by the copyright owner. We are making such material available to advance understanding of computer science, IT technology, economic, scientific, and social issues. We believe this constitutes a 'fair use' of any such copyrighted material as provided by section 107 of the US Copyright Law according to which such material can be distributed without profit exclusively for research and educational purposes.

This is a Spartan WHYFF (We Help You For Free) site written by people for whom English is not a native language. Grammar and spelling errors should be expected. The site contain some broken links as it develops like a living tree...

You can use PayPal to to buy a cup of coffee for authors of this site


The statements, views and opinions presented on this web page are those of the author (or referenced source) and are not endorsed by, nor do they necessarily reflect, the opinions of the Softpanorama society. We do not warrant the correctness of the information provided or its fitness for any purpose. The site uses AdSense so you need to be aware of Google privacy policy. You you do not want to be tracked by Google please disable Javascript for this site. This site is perfectly usable without Javascript.

Last modified: January, 09, 2020