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Search Engine Spider and User Agent Identification Forum

    
UAs that asked for robots.txt
incrediBILL




msg:4340281
 9:41 am on Jul 16, 2011 (gmt 0)

Just ran a report for all UAs that requested robots.txt]

I normally wouldn't post a link but I got a 'post too large' error.

Here it is for your viewing pleasure...

[crawlwall.com...]

 

Mokita




msg:4340283
 10:03 am on Jul 16, 2011 (gmt 0)

Hi Bill,

Many thanks for that. Please would you indicate what timeframe these were collected in. Are they all recent, or going back a fair way?

I notice Accoona in there, didn't that SE die some years ago?

BTW - very glad I don't look after your site, about half of those I've never seen before ;)

lucy24




msg:4340286
 10:25 am on Jul 16, 2011 (gmt 0)

Holy ###.

Now here's the part that gives your log-wrangling script a workout: How many of those robots went on to read robots.txt and abide by its instructions? Some robots have fooled me by picking it up faithfully on every visit-- and then merrily going wherever they want to go. Some are so entranced by robots.txt-- whose subject matter is not gripping-- that they never get around to picking up any real files. (The bingbot does this consistently. When it does get bored, it varies the menu by landing on the nearest 301. It is a mystery to me how it finds them or why it wants to, since it never follows the redirect. Maybe it's in secret communication with the googlebot.)

And then there was the robot I should by all rights have locked out on sight because it grabbed everything it could lay its hands on, never even pretended to look at robots.txt... but it faithfully obeyed all "nofollow" directives! Score a victory for the belt-and-suspenders principle.

Pfui




msg:4340308
 1:05 pm on Jul 16, 2011 (gmt 0)

lucy, try whitelisting robots. I use a CGI to let only the majors see the 'complete' version (which matches my sitemap.xml) and then I use mod_rewrite to let them hit only the pages indicated. Everyone else gets a generic full Disallow (and no access to sitemap.xml) unless and until I give them any leeway -- which I rarely ever do because too many are totally untrustworthy.

Oh, also: Bingbot, and other majors, hit many, many times from many, many different servers. So while it may look like they're not retrieving anything beyond r.txt, they are, just not by that server at that time.

lucy24




msg:4340368
 6:33 pm on Jul 16, 2011 (gmt 0)

Robots get classified as either "No skin off my nose" or "I don't like your face", which bypasses most objective standards ;) Analogously: hotlinkers annoy me on principle-- and they annoy their sites' visitors even more, what with all that download time-- so they're all blocked even though the server load is minuscule overall. But everyone including the grimiest Byelorussian robot is allowed to see the 403 page, because the server weeps if they're not allowed to.*

But if I wanted to be principled about it I'd say that if you whitelist the known robots from approved sources, and lock out everyone else, you've wiped out any chance of someone starting up a genuinely new and interesting search engine. They gotta practice on someone, and their results can't possibly be any stranger than g###'s.


* I don't understand how or why this works, In the error logs, all blocked requests for an interior page-- but not the front page-- are followed with a request for the 403 page. So let's make the error processor happy. And any passing Chinese human can at least see my color scheme ;)

Pfui




msg:4340389
 9:36 pm on Jul 16, 2011 (gmt 0)

Wow. You're a sympathetic soul! And/or independently wealthy:)

After decades (yikes) of spotting abusive bots, I'm happily hard-nosed about any person or company 'practicing on' -- a.k.a. using and impacting -- my work, my visitors, my server, my bandwidth, my wallet.

If some bot-runner is either too ignorant or imperious to code for reading-and-heeding robots.txt, they can simply stay the heck away.

(Re your asterisk: I don't understand what you don't understand, sorry. A rewrite prob?)

incrediBILL




msg:4340487
 12:35 pm on Jul 17, 2011 (gmt 0)

I did an update and included IPs and dates
[crawlwall.com...]

The blank UAs at the top have some oddness and need smoothed over, maybe later

g1smd




msg:4340537
 5:10 pm on Jul 17, 2011 (gmt 0)

Wow. That's a helluva list - and covering several years. Very useful.

lucy24




msg:4340614
 10:04 pm on Jul 17, 2011 (gmt 0)

You're a sympathetic soul! And/or independently wealthy :)

There is more than one way to interpret the utterance "My web site has no significant effect on my income" ;)

But maybe I am simply misunderstanding. When people talk about whitelisting and blacklisting, do they mean in robots.txt or in .htaccess?

Pfui




msg:4340627
 11:35 pm on Jul 17, 2011 (gmt 0)

For me, site-specific access control on my old Apache box is via .htaccess, and relying primarily on mod_rewrite (plus some Deny from).

robots.txt is a toothless tiger if it's neither retrieved nor heeded aprés retrieval. I use it, but only via a script that gives the 'full' list to my choice of major SEs, and a full Disallow to absolutely anyone else.

The script I use is a verrry heavily modified version of Lee Killough's officially outdated robots.txt-generating CGI [leekillough.com...]

incrediBILL




msg:4340685
 6:02 am on Jul 18, 2011 (gmt 0)

I went back and color coded all the IPs visiting from 2011 in orange so it's easier to see what's currently active.

If I get some time I could highlight the UA too, this was just a quick 'n dirty report ;)

Maybe next pass I'll get reverse DNS on this mess

I have tons of other data too, some day...

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