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Questions tagged [web-crawler]

The tag has no usage guidance.

0
votes
2answers
68 views

How possible it is to keep web scraped data in sync at scale

I have taken a look at Google Shopping for Hakko FX888D-23BY Soldering Station, and it gives this: Notice that Walmart is $115.19 here. Meanwhile, at Walmart.com it looks like this: So it's $97.79 ...
0
votes
1answer
50 views

How large-scale production web crawlers improve performance when it comes to running into already visited links

I have built a very basic webcrawler running off my laptop so it has limited memory and limited hard drive space. The way I have it now is I'm using MongoDB to store the links I find on pages. I make ...
2
votes
1answer
482 views

How to reverse engineer URL routes from a bulk of HTTP requests/responses

I am building a web application crawler that crawls for HTTP requests (GET, PUT, POST, ...). It is designed for one specific purpose; bug bounty hunting. It enables pentesters to insert exploit ...
1
vote
0answers
1k views

What are the best practices for picking selectors for web scrappers?

The following is an example using https://github.com/GoogleChrome/puppeteer 'use strict'; const puppeteer = require('puppeteer'); (async() => { // const browser = await puppeteer.launch(); // ...
1
vote
1answer
172 views

detecting website opening in new tab/window?

So, as part of my final year project, I'm writing a web crawler in Java to gather website data that I will then process. One of the attributes I need to gather is "number of popups". I know a pop-up ...
4
votes
1answer
182 views

Is it considered bad practice to crawl through the mobile version of a site?

I am building a web spider to crawl through several different sites, but one of them uses javascript buttons instead of links for several functions. And while I could learn to follow them, it adds an ...
4
votes
1answer
217 views

How much processing to do in the crawler? - good crawling practices

I am currently working on a pet project in Python with scrapy that scrapes several ebay-like sites for real-estate offers in my area. The thing is that some of the sites do seem to provide more ...
5
votes
1answer
517 views

Can I whitelist user agents that will execute JavaScript?

I'm building a SPA (single page application) so that when a browser request a page from my server, it only receives a small HTML and a big JavaScript app that then asks the appropriate data from the ...
-2
votes
1answer
1k views

Crawler - programming language choice [closed]

I'm currently developing a web crawler. The first version was developed in Node.js and runs pretty well. The issues that I encountered with Node.js are in no particular order: slow URL and query-...
3
votes
0answers
100 views

IRLBot Paper DRUM Implementation - Why keep key, value and auxiliary buckets separate?

Repost from here as I think it may be more suited to this exchange. I'm trying to implement DRUM (Disk Repository with Update Management) as per the IRLBot paper (relevant pages start at 4) but as ...
2
votes
2answers
1k views

Patterns for creating adaptive web crawler throttling

Im running a service that crawls many websites daily. The crawlers are run as jobs processed by a bunch of independent background worker processes, that picks up the jobs as they get enqueued. Now ...
1
vote
2answers
313 views

How do I ensure my site will be crawled when articles are generated by the database?

I wasn't sure how to ask the question. But basically, it's a textbook scenario. I'm working on a site that's article based, but the article information is stored in a database. Then the page is ...
-1
votes
1answer
3k views

web spider for facebook

I just subscribed to a facebook page which post links to different open source projects or code archives. I'll like to save those links and descriptions to a local db. How can I do that? I heard ...
5
votes
2answers
13k views

What is the way to go to extract data from websites? [closed]

I've been thinking about a side project that envolves web data scraping. Ok, I read the Getting data from a webpage in a stable and efficient way question and the discussion gave me some insights. ...
4
votes
2answers
5k views

How to find a 'good' seed page for a web crawler? [closed]

I started building a web crawler and read somewhere that it's a very hard problem to find a good seed page for the crawler. Can anyone explain me if there is any pre-defined procedure/ guidlines of ...
26
votes
3answers
13k views

What will happen if I don't follow robots.txt while crawling? [duplicate]

I am new to web crawling and I am testing my crawlers. I have been doings tests on various sites for testing. I forgot about robots.txt file during my tests. I just want to know what will happen if ...
3
votes
1answer
189 views

Ways of Gathering Event Information From the Internet [closed]

What are the best ways of gathering information on events (any type) from the internet ? Keeping in mind that different websites will present information in different ways. I was thinking 'smart' ...
2
votes
5answers
660 views

Website Country Detection

I have a web crawler, and I'm looking for hints that will help me automatically detect a website country of origin. And by country of origin I generally mean the country the website is targeting. For ...
6
votes
4answers
4k views

Development of a bot/web crawler detection system

I am trying to build a system for my company which wants to check for unusual/abusive pattern of users (mainly web scrapers). Currently the logic I have implemented parses the http access logs and ...
6
votes
3answers
2k views

Looking for good books about the theory behind search engines [closed]

I am working on a project that requires that I understand different techniques used by search engines for the web. I have a strong scientific and development background, so I am not afraid of highly ...
0
votes
2answers
3k views

Roll your own web crawler to crawl one specific website that has multiple entries

What sort of languages would be able to handle writing your own web crawler? Could PHP handle this? I'm quite good with PHP (following best practices etc). But I'd like a good reason to learn a ...
83
votes
7answers
18k views

How to be a good citizen when crawling web sites?

I'm going to be developing some functionality that will crawl various public web sites and process/aggregate the data on them. Nothing sinister like looking for e-mail addresses - in fact it's ...