Questions tagged [web-crawler]

A web-crawler (also known as a web-spider) traverses the webpages of the internet by following the links of urls contained within each webpage. There is usually an initial seed of URLs from which the crawler is given to initialize its crawl.

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Can many connections cause dns lookup or request timeout?

I'm running crawler on my company's internet. 10 raspberry pi * 45 crawlers each, 2 desktops * 70 crawlers each These processes are sending requests 24/7. 3~5% of packets are getting lost. This is ...
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Getting requests for suspicious php files

I am getting weird GET requests on my (non php supporting) web server for some curious looking php files. Was just wondering whether these are harmless requests of certain browser tools or attempts ...
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Website blocks my requests from linux ubuntu server

I'm a Java engineer with zero dev ops experience. Lately I was playing around with linux ubuntu server first time and used docker with my selenium project and faced this problem: I try to scrape HTML ...
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How to avoid emails sent to Google's deep web crawler

My website has an area restricted to users who sign up with a valid email. I have got requests with bogus emails, and I want to avoid sending emails to non-existent addresses lest they increase the ...
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Spotify Bot Using Massive Bandwidth on NGINX Cached Server?

I have a couple of podcasts I host on my site and I've noticed a disturbing trend the last couple of months: my site's bandwidth usage has gone up by 10x, but it appears most of it was a series of ...
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Can missing HTTP referrer's identify web crawlers?

I am currently trying to analyze the traffic of a website. Besides specifics regarding the requested resource and timestamps, the tracking system only provides the request's HTTP referrer. In most ...
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Strange behavior in Apache log

I have a Nextcloud server running on Apache, and disabled my firewall for about 5 minutes while I ran an apt-update. I decided to check the logs after, and found this from an unknown IP. It looks like ...
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1 vote
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Why would Apache log different response sizes for the same url?

I noticed a couple (ostensibly-)harmless log entries, and--I'm admittedly overthinking this by a mile--got curious about Apache2 response sizes. This Ukranian crawler † hit my web daemon, two seconds ...
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How to block attempts for phpMyAdmin? [closed]

I converted my website from asp.net to .net core and host on same server. Now, website gets hundred of hits daily from different IP's trying to access like below /php-myadmin/ /wp-content/ /mysql/ ...
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-3 votes
1 answer
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How to gather in a save, cheap and easy way high quality entropy on a Linux machine? [closed]

When no radioactive decay is available and good entropy is strongly advised for security reasons you experience a real problem. HTTPS connections consume a lot of entropy. If you have thousands of ...
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-4 votes
2 answers
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what ip will logged in a website if I access a website via another website through my PC? [closed]

If http://example2.com sends cURL connection to a website called http://example1.com. If I access http://example2.com from my pc to see the content of http://example1.com, than would http://example1....
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HTTrack stores extensionless pages with a .html appended

I'd like to mirror an old site of mine to local files. I've used httrack for this in the past, but I'm having a problem this time that I really thought I figured out before, but can't seem to now. ...
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How to disallow crawling for all subdomains using my main domain's physical robots.txt file [closed]

I have multiple physical sub-domains and I don't want to change any robots.txt file of any of that sub-domains. Is there any way to disallow all the sub-domains from my main domain's physical robots....
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Strange Google Behavior with indexing SSL Mismatch content

Here is a strange one for you. We have a server with multiple VHOSTS that include both SSL and Non-SSL domains. Domain1 is SSL enabled, while Domain2 doesn't have SSL. Since all these domains are ...
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Yandex/Google Bot Spam

I recently logged into a vps I have (with vultr, if that is of any concern). To find a large amount of nginx logs and higher than expected load average. This server is doing effectively nothing, and ...
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40.96.18.165 keeps visiting my web server

Something/someone from 40.96.18.165 has been hitting my web server exactly eight times a day everyday since Feb 5, 2017. The user agent used is Mozilla/4.0 (compatible; MSIE 7.0; Windows NT 6.0). ...
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How many requests can a router handle?

I made a script to scan a file which contains a portion of ipv4 addresses (about 50 million), it attempts to connect to the website using OpenSSL and extract a small piece of it and writes it into a ...
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Bots/crawlers adding numbers to GET parameters

I've got some errors showing up in my site logs where some bots are trying to access URLs with strange GET params. # normal url example.com?foo=123456 # odd url triggering integer error by bots ...
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Barracuda.com and crawling / pinger services causing unusual load on web servers

I recently received a large number of hits on my home page from 64.235.153.8. It revolves to barracuda.com I know Barracuda as an enterprise class spam detection/prevention solution. Do they also ...
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Bash script - wait for all xargs processes to be finished

I have written a small bash script for crawling an XML sitemap of URLs. It retrieves 5 URLs in parallel using xargs. Now I want an E-Mail to be sent when all URLs have been crawled, so it has to wait ...
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Block Bad Bots in Nginx for Multiple Sites

I need to block a bunch of robots from crawling a few hundred sites hosted on a Nginx web server running on a Ubuntu 16.04 machine. I've found a fairly simple example here (important part of the ...
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Is offering the contents of a third party web site offline violating the law? [closed]

I have developed a nice little app that crawls a bunch of newspaper web sites and makes their latest content available on my phone offline. It's basically a Pocket app that saves contents ...
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12 votes
3 answers
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How do sites detect bots behind proxies or company networks

How do large sites (e.g. Wikipedia) deal with bots that are behind other IP masker? For instance, in my university, everybody searches Wikipedia, giving it a significant load. But, as far as I know, ...
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1 vote
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Suspected malicious activity by one of my site's users; any way to know for sure?

In the course of about 2 hours, a logged in user on my website accessed roughly 1,600 pages in a way that looks suspiciously similar to a bot. I am concerned because users must purchase access to the ...
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Q: Strange web traffic - Is this an attack?

I recently noticed some strange traffic in my nginx access logs. I'm not sure if these indicate an attack, a mistake, or something else. I've started sending these to HTTP 444, so these logs will ...
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3 votes
1 answer
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Baidu Spider causing 3Gb of traffic a day - but I do business in China

I'm in a difficult situation, the Baidu spider is hitting my site causing about 3Gb a day worth of bandwidth. At the same time I do business in China so don't want to just block it. Has anyone else ...
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Moved website to new server - updated DNS - web crawlers still hitting old site by IP

About ten days ago I moved a site - mostly a Joomla discussion board - to a new server at a different IP address. During a brief scheduled downtime I replicated the content over and completed DNS ...
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Restricting Access from BOTS

I would like to protect my server from too many hits from Bots. Considering a scenario, where in a server (physical) located in a private network and hitting my server continuously. Do i have a ...
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1 answer
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Nginx log shows suspicious directory access!!! How to block them?

On my Nginx log recently i have noticed 100's entries like this where a directory search was executed with error, because those directory does not exist on my webserver. now, how can I block them once ...
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2 votes
2 answers
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What's the purpose of spammy HTTP referers?

In the logs of my website, there's a lot of visits with a HTTP referer set to spam-like websites (usually Russian sites, I've noticed). I assume what they're doing is just using a web crawler to visit ...
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1 vote
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What are the symptoms of an overloaded webserver

I'm maintaining some web crawlers. I want to improve our load/throttling system to be more intelligent. Of cause I look at response codes, and throttle up or down based on that. I would though like ...
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How to make Google crawl my site using IPv6 address when my domain name has both IPv4 and IPv6 addresses?

My domain name has both IPv4 and IPv6 addresses assigned. IPv4 connection to Google can't be available all the time due to restrictions of my campus network, but IPv6 is available all the time. ...
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Is it possible to block HTTP traffic from specific machines?

I have some web crawlers, and a specific website seems to be blocking traffic temporarily after some time. The thing is, even though all clients have the same external IP address (they access the ...
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Switching between multiple authentication types on same URL

I have a secure SSO site that uses Shibboleth authentication and SAML identity provider. I need to allow a Google Search Appliance crawler to come index the URL's. I have a requirement to change on ...
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30 votes
4 answers
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Does a company have implied right to crawl my website?

I have found out that McAfee SiteAdvisor has reported my website as "may be having security issues". I care little about whatever McAfee thinks of my website (I can secure it myself and if not, ...
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Get all urls of a website [closed]

I wanna build a tool which scans a website for all urls, but not the urls within the page but of the site self, but I don't know how. Could anyone give me an example how I can start? Example: www....
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Tool or website to check links

We supply Magento and Typo3 installations to customers. To improve QA we wanted to use an automatic link checker to check for broken and/or outdated links - automatically. We want to check all links ...
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Why is googlebot requesting robots.txt from my SSH server?

I run ossec on my server and periodically I receive a warning like this: Received From: myserver->/var/log/auth.log Rule: 5701 fired (level 8) -> "Possible attack on the ssh server (or version ...
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is there any web crawler can get access to users region for download? [closed]

Actually I am using Httrack as a web crawler, can it use my credentials to access members area and download the zip files because they are restricted from public access. Thank you in advance. ...
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Protection against scrapping with nginx

This morning we had a crawler going nuts on our server hitting our site almost 100 times per second. We'd like to add a protection for this. I guess I'' have to use HttpLimitReqModule but I don't ...
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Referrer in access.log is a directory

It seems that the referrer on the following log is a folder. 112.200.208.5 - - [29/Jul/2013:20:43:14 +0800] "GET /sites/default/files/download/argie/pos-code.zip HTTP/1.1" 206 294677 "http://www....
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How to Block Web Crawler from Downloading File

Is it possible to block web crawler from downloading files (like zip file) in my server? I supposed to create a PHP script using cookies to track visitors specially web crawlers to login/register ...
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How to Exclude Log Using Fail2Ban logpath with Wildcard Settings

I'm using wildcard in the logpath value as shown below: [http-get-dos] enabled = true filter = http-get-dos logpath = /var/log/ispconfig/httpd/*/access.log maxretry = 250 findtime = 300 #ban for 10 ...
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How to ban web crawler using fail2ban

I am using nginx and I am always hit by web crawler if I am correct. I tried to configure fail2ban but the IP address cannot be detected by fail2ban. The reason that it is not detected because it ...
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Is there a chance to block images spiders / bots on dedicated servers without using robots.txt or .htaccess?

We know that we can block certain spiders from crawling websites pages using robots.txt or .htaccess or maybe via the Apache configuration File httpd.conf. But that requires to edit may be a large ...
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2 answers
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Strange "GET /api/levels/ " and "GET /play/" requests in logs

I've setup new Amazon EC2 instance. In a day or two started to get strange "GET" requests from the "google bot-like" IP's (eg 66.249.76.84, 66.249.74.152) about one in 10 seconds (some examples): 66....
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How to fix the correct html file as homepage? [closed]

A search for my domain shows defaulthomepage along with html file that my hosting service, using plesk 9.5.4, provides as a placeholder. I have since deleted the old index file and added a new index....
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How do I scan my folders for a website? Like a crawler?

I'd like to scan all the url's on my website as well as get the files in them, but the thing is, there are too many for me to do this manually so how would I do this? I'd like it formatted anyway as ...
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1 vote
1 answer
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Googlebot repeatedly looks for files that aren't on my server

I'm hosting a site for a volunteer organization. I've moved the site to WordPress, but it wasn't always that way. I suspect at one point it was hacked badly. My Apache error log file has grown to ...
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How to create a global robots.txt that gets appended to each domain's own robots.txt on Apache?

I know can create ONE robots.txt file for all domains on an Apache server*, but I want to append to each domain's (if pre-existing) robots.txt. I want some general rules in place for all domains, but ...
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