Web crawler – Abc Directory http://abcdirectory.org/ Sun, 27 Mar 2022 14:14:04 +0000 en-US hourly 1 https://wordpress.org/?v=5.9.3 https://abcdirectory.org/wp-content/uploads/2022/01/icon-2022-01-26T213455.069-150x150.png Web crawler – Abc Directory http://abcdirectory.org/ 32 32 What is a web crawler and how does it work | by Octoparse | March 2022 https://abcdirectory.org/what-is-a-web-crawler-and-how-does-it-work-by-octoparse-march-2022/ Sat, 26 Mar 2022 03:55:40 +0000 https://abcdirectory.org/what-is-a-web-crawler-and-how-does-it-work-by-octoparse-march-2022/ A web crawler, also known as a web spider or search engine robot, is a robot that visits and indexes the content of web pages anywhere on the Internet. With such a large amount of information, a search engine will be able to present its users’ relevant information in search results. The goal of a […]]]>

A web crawler, also known as a web spider or search engine robot, is a robot that visits and indexes the content of web pages anywhere on the Internet. With such a large amount of information, a search engine will be able to present its users’ relevant information in search results.

The goal of a web crawler is to get information, often to keep getting new information to feed a search engine.

If a search engine is a supermarket, what a web crawler does is like big sourcing – it visits different websites/webpages, navigates and stores information in its own warehouse. When a customer comes and asks for something, there will be certain products to offer on the shelves.

He is supplied by indexing web pages and the content they contain. The indexed content will be ready to be retrieved and when a user searches for a particular query, it can present the user with the most relevant information.

A web crawler is a super workhorse or it has to be. It’s not just because there is a huge number of new pages being created every minute in the world (about 252,000 new websites are created every day worldwide according to Siteefy), but also due to changes and updates to these pages.

Some web crawlers are active on the Internet:

They are primarily intended for search engines. Despite web crawlers working for a search engine, some web crawlers collect information from websites for SEO purposes such as site auditing and traffic analysis. Instead of offering search results to search engine users, they provide valuable information to website owners (like Alexa).

Since you have a basic idea of ​​what a web crawler is, you might be wondering how a web crawler works.

There are a large number of web pages available on the internet and their number is increasing rapidly every day. How does a web crawler skim them all?

In fact, not all content on the Internet is indexed by web crawlers. Some pages are not open to search engine robots (#) and some simply do not have the opportunity to meet them.

Start from seed URLs

Normally, a web crawler starts its journey from a set of known URLs, or so-called seed URLs. He walks the Meta information web pages (e.g. title, description) as well as the body of the web page. As these pages are indexed, the crawler continues to crawl the hyperlinks to visit the web pages that are linked in the starting pages.

So here is the basic route a web crawler would take:

  • Access the list of known web pages
  • Extract the URLs that are linked in these web pages and add them to the list
  • Keep visiting newly added pages

By constantly visiting web pages, web crawlers can discover new pages or URLs, update changes to existing pages, and flag those links as dead.

Web crawlers prioritize

Even though web crawlers are automated programs, they cannot keep pace with the rapid expansion of the Internet and constant changes in web pages. In order to capture the most relevant and valuable information, web crawlers need to follow certain rules that help prioritize all added links, which should be visited first.

For example:

  • Web pages that are linked by many other relevant pages will be considered more informative than those pages without any reference. Web crawlers are more likely to prioritize visiting these web pages.
  • Web crawlers revisit web pages to make sure they keep up with updates and get new information. A regularly updated webpage can be crawled more frequently than ones that rarely make changes.

All of these rules are made to help this whole process to be more efficient and to be more selected on the content they explore. The goal is to provide the best search results to search engine users.

About indexing

A search index helps a search engine return results quickly and efficiently. It works like an index in a book – to help you quickly jump to the needed pages (information) with a list of keywords (or chapters).

The robot builds the index. It visits the pages of the website, collects the content, places it in an index and sends it to the database. You can think of the index as a huge database of words and corresponding pages where they appear.

For webmasters, it is important to ensure that the website is properly indexed. Only when the web page is indexed will it appear in search results and be discovered by the public. While a website owner can also decide how a search crawler crawls their website. Robots.txt is one such file that webmasters create to tell search bots how to crawl their pages.

As mentioned, the way a search engine crawls your website can affect how your pages are indexed and therefore whether they show up in search results. This is obviously what an SEO professional would care about.

If the ultimate goal is to get more traffic from a search engine like Google, there are a few steps you need to pay attention to:

Get Crawled: High Quality Backlinks

A web crawler bot starts from a list of seed URLs and these are normally quality pages from high authority websites. If the page you want to rank is linked by these pages, it will definitely be crawled by the bot. We don’t know what the starting URLs are, but you’re more likely to be crawled if you have more backlinks, especially when they come from high-performing websites.

In short, earning more backlinks to your website is essential, especially from relevant, high-quality pages.

Get indexed: original content

Your page can be crawled but not indexed. The web crawler bot is selective. It won’t store everything they’ve seen in the search index. There is a way to find out how many pages on your website are indexed by Google – type in “site:your domain” and do a Google search.

If you want to know exactly which pages are indexed and which are not, the data is available at Google Search Console: Google Search Console < Index < Coverage

So, what type of content is indexed (by Google for example)? Many influential factors come into play so the first thing to do is to write original content. Google’s mission is to provide valuable content to its users. It is almost the same for all search engines and duplicate content is always subject to penalties. Do research intent and keyword research. Write and tell your own story or opinion.

Sometimes web crawling and web scraping are used interchangeably. However, they are applied in very different scenarios for different purposes. Web crawling is a search engine crawler exploring unknown pages to store and index while web scraping is targeting a certain list of URLs or domains and extracting necessary data into files to find them. other uses.

Web scraping and web crawling work differently.

As we mentioned above, web crawling starts from a list of seed URLs and continues to visit what is linked to expand the reach to more unknown pages. Although a crawler may have a set of rules to decide which page to visit before others, it does not have a fixed list of URLs or is limited to a certain type of content.

However, web scraping has its clear target. (What is web scraping?) People come to web scraping with a list of URLs or domains and know exactly what data they are capturing from those pages.

For example, a shoe seller may wish to download information about shoe suppliers from Aliexpress, including supplier name, product specifications, and prices. A web scraper will visit the domain (Aliexpress), search for a keyword to get a list of relevant URLs, visit those pages and locate the necessary data on the HTML file and save it to a document.

They have different goals.

Web crawling consists of exploring and scrutinizing as many pages as possible, indexing those that are useful and storing them in the database in order to build an effective search engine.

A web scraper can work for very different purposes. People can use it to gather information for research, data for migrating from one platform to another, prices for competitor analysis, contacts for lead generation, and more.

They have one thing in common: they both rely on an automated program to make work (impossible for a human) doable.

Read also :
Web scraping stories
Web scraping business ideas

If you are interested in web scraping and data extraction, there are several ways to get started.

Learn a programming language.

Python is widely used in web scraping. One reason is that open source libraries like Scrapy and BeautifulSoup are well built and mature to work on Python. Besides Python, other programming languages ​​are also used for web scraping, such as Node.js, Php, C++.

Learning a language from scratch takes time and it’s good if you can start from what you know. If you are a beginner, evaluate your web scraping project better and choose a language that best suits your request.

Get started with a no-code or low-code web scraping tool.

It really takes time and energy to learn a programming language from scratch and be good enough to tackle a web scraping project. For a business or entrepreneurs busy maintaining a business, data services or a low-code web scraping tool is a better option.

The main reason is that it saves time. Since the launch of Octoparse in 2016, millions of users have used Octoparse to mine web data. They take advantage of the interactive workflow and intuitive tips guide to create their own scrapers. A low-code tool also enables team coordination as it lowers the threshold for processing web scraping and web data.

If you need to download web data, try Octoparse (free plan available). these webinars will get you on board and more importantly, if you get stuck, feel free to contact our support team (support@octoparse.com). They will cover you.

日本語記事:website?
web and web 公式サイトでも読むことができます。
Article in Spanish: ¿Qué Es Web Scraping (Web Crawler) and Cómo Funciona?
Also can read the web scraping articles in el Official site

]]>
What is an indexing robot? https://abcdirectory.org/what-is-an-indexing-robot/ Wed, 23 Feb 2022 08:00:00 +0000 https://abcdirectory.org/what-is-an-indexing-robot/ Web crawlers, also known as spiders, are an integral part of the search engine user experience. Without them, search engines as we know them would not exist. However, while web crawlers are commonly associated with search engines, they are also used in other use cases, such as online browsing. content aggregation sites. Essentially, spiders are […]]]>

Web crawlers, also known as spiders, are an integral part of the search engine user experience. Without them, search engines as we know them would not exist. However, while web crawlers are commonly associated with search engines, they are also used in other use cases, such as online browsing. content aggregation sites.

Essentially, spiders are software that automatically discovers websites. But there’s more to their functionality, which brings us to the question, what is a web crawler?

What is a crawler?

Each website whose link you click on a search engine results page (SERP) or online aggregation site is the product of the invisible work done by crawlers. Ideally, and as stated above, these bots or spiders discover websites and web pages. They do this in a thorough and sophisticated way by following the hyperlinks included in the web pages. Usually, websites contain links for ease of navigation – these hyperlinks direct users or crawlers to content that is part of the website or an external website.

How does a web crawler work?

Web crawlers use hyperlinks to discover web pages. They simply start with an array of known websites (URLs) from previous crawls or from web addresses provided by site owners. Then the spiders visit the sites and use the links included on the known web pages to discover new pages, either on the website or on external sites. They repeat this process again and again, but not after doing an integral thing.

When crawlers discover a new page, they crawl the content from the first line of the code file to the last. They collect this information, organize it by associating a URL to this data, and store/archive it in databases called indexes. For this reason, web crawling is also called indexing, as it involves storing discovered pages and their content in indexes.

When organizing this data for a webpage, crawlers move on to the next webpage(s) by following the link(s) there. They repeat this process over and over again. Notably, web spiders discover billions of new web pages through this automated but repetitive process. And to ensure indexes are up-to-date, crawlers periodically repeat the entire web crawling process to discover newly created web pages or recently updated content.

What is an indexing robot used for?

A spider performs the following tasks:

  • It discovers new web pages and their associated addresses/URLs
  • A web crawler displays the webpage, crawls the content stored in each webpage and collects key data like all words, URL, meta description, recent site update date, etc.
  • The spider organizes and stores key data from each web page in an index to allow the search engine or online aggregator to retrieve this data later, presenting it on the SERP according to relevance.

In particular, by collecting key data such as words, the index can identify words that will help search engine users find web pages. These words, called keywords, are an integral part of search engine optimization (SEO).

Although web crawlers collect data from websites, their functionality should not be confused with that of web scrapers.

What is a web scraper?

A web scraper is a bot that gathers specific data from websites in what is known as web scraping or web data harvesting. Web scraping is a step-by-step process that starts with requests.

A web scraper sends requests to specific sites from which data needs to be extracted. The respective web servers respond by sending an HTML code file containing all the data for the web page(s). Then the scraper analyzes the data, then converting it from an unstructured format to a structured form that humans can understand. Finally, the web scraping tool uses the structured data for downloading as a CSV, spreadsheet, or JSON file.

Differences between a web crawler and a web scraper

Web crawler Web scraper
It is used for large scale applications It is used for large and small scale applications.
A web crawler collects an indiscriminate amount of data which includes all words contained in a web page, URL, meta description, etc. A web scraper only collects specific, predefined and tangible data
Data collected by a web crawler is stored in indexes and cannot be downloaded by humans Data collected by a web scraper is available for download by humans
A web crawler never relies on the services of a web scraper A web scraper can sometimes depend on the operation of a web crawler
The output of a web crawler is a list of URLs ranked by relevance and displayed on SERPs or aggregator sites The output of a web scraper is a downloadable file containing a table with dozens of fields and entries

Conclusion

A web crawler is an integral part of today’s internet age. It is at the heart of search engines as we know them. However, although this program collects data from web pages, it should not be confused with a web scraper, which collects specific information from a small group of websites.

If you are interested in knowing more, thereYou can read the article here for an in-depth look at web crawlers.

]]>
How to script a web crawler https://abcdirectory.org/how-to-script-a-web-crawler/ Tue, 22 Feb 2022 08:00:00 +0000 https://abcdirectory.org/how-to-script-a-web-crawler/ If you’ve ever wanted to collect and extract valuable data from the web, writing a web crawler might be the best way to do it. Crawlers are data scrapers that can find, crawl, and navigate websites to capture, scrape, extract, and store the information you need. These are programs developed to read data from the […]]]>

If you’ve ever wanted to collect and extract valuable data from the web, writing a web crawler might be the best way to do it. Crawlers are data scrapers that can find, crawl, and navigate websites to capture, scrape, extract, and store the information you need.

These are programs developed to read data from the Internet by locating and downloading the targeted web pages. For this reason, you can use them for various applications, such as finding competitor prices on e-commerce sites, collecting user reviews and comments on social networks, sports scores, stocks, financial information , etc

Even though it is much easier to script a web crawler today thanks to top programming languages ​​with massive libraries, it still requires some know-how. Let’s talk about what a web crawler is and how to set up a crawler to create a database you can rely on.

Basics of web crawlers

What is an indexing robot?

Simply put, it is a program, an Internet crawler that crawls and indexes data (content) of web pages on the web. Also called a crawler, spider, or bot, a crawler uses the power of automation to target, crawl, and extract data and information from web pages. It also exports the extracted data into a series of structured formats, such as database, table, list, etc.

The most popular internet crawler known to all internet users is Google. It’s a search engine which uses its crawlers to constantly search the web for the latest and most up-to-date content.

Without its crawlers, Internet users would not be able to receive search results within seconds each time they request to see content online. Billions of Internet users generate quintillions of bytes of data every day. Imagine going through all that data and not being able to automatically find what you’re looking for. Oxylabs has a blog that goes more in depth on the topic “what is a web crawler”, you should definitely check.

Crawler Scripts Explained

Since it’s impossible to make sense of the internet without crawling the web, a search engine is needed to quickly crawl the web, find and index the most relevant websites, and deliver you a webpage you asked to see. You can create a web crawler to help you achieve all of these goals and more.

In the digital business landscape, modern businesses use web crawlers for a variety of purposes, including:

  • Data aggregation– businesses need the most up-to-date data to power their operations, beat their competitors, and find the best ways to increase sales. Web crawlers allow them to compile data on various topics from an array of online resources and store it in an easily accessible and secure location.
  • Sentiment analysis– knowing what the target audience thinks of particular products and services can help a company improve its marketing and advertising campaigns. Collecting feedback is also a great way to improve your trading strategy. A web crawler can collect valuable information regarding comments and reviews for analysis.
  • Lead generation– finding as many leads as possible is the only way to stay relevant in the digital business landscape. Web crawlers can gather all the information a business needs to generate more leads. They can retrieve contact information from attendee lists, public profiles, phone numbers, emails, and more.

The crawler scripting process allows users to determine what they want a crawler to do. Aside from the three use cases we mentioned here; you can also use bots for many other applications.

The process of creating a web crawler

Let’s see what it takes to create a web crawler.

Get ahead of the coding to write your mining script

Learning a programming language or two is a great way to build a scraper that will do everything you want it to do. Python is one of the most popular computer languages ​​for writing bot code.

Python is mainly used for web scraping. It can send HTTP requests to multiple web pages and return the content of targeted web pages. It also allows for better control and page navigation to get the data.

Use web scraping tools

If coding is not an option, you can use web scraping tools to create a web crawler, such as Octoparse. A web scraping tool allows you to create a crawler that can extract the specific type of data you are looking for. Just run the program and locate the main menu.

Select Advanced Mode and enter the target URL to start the explore operation. Configure paging to help your bot discover target web pages by clicking the Next Page button and opening the Tips panel. Select the “Loop click single element” button, then select an element and click it.

Go to the Action Tips panel and select “Loop click each item” to allow your crawler to select all items that contain similar items. Select “Extract text from selected item” and repeat as many times as needed until you get the information you need. When done, click Start Extraction.

Conclusion

Writing a script for a web crawler can seem like a tedious and time-consuming process. However, you have a wide range of tools and means that you can use to get the job done almost without maintenance or any other cost.

Just keep in mind that your crawler will need constant updates to keep up with the constantly changing nature of web pages on the internet. Each website is unique and requires you to write a particular script that will be compatible with the language of the site. It takes a bit of time to get into the science behind it, but it’s totally manageable.

]]>
HubSpot: What is a web crawler? (In 50 words or less) https://abcdirectory.org/hubspot-what-is-a-web-crawler-in-50-words-or-less/ Thu, 17 Feb 2022 08:00:00 +0000 https://abcdirectory.org/hubspot-what-is-a-web-crawler-in-50-words-or-less/ When it comes to technical referencing, it can be difficult to understand how it all works. But it is important to gain as much knowledge as possible to optimize our websites and reach a wider audience. One tool that plays an important role in search engine optimization is none other than the web crawler. In […]]]>

When it comes to technical referencing, it can be difficult to understand how it all works. But it is important to gain as much knowledge as possible to optimize our websites and reach a wider audience. One tool that plays an important role in search engine optimization is none other than the web crawler.

In this article we will learn what are crawlers, how they workand why they should crawl your site.

What is a web crawler

A crawler – also known as a web spider – is a bot that searches and indexes content on the Internet. Essentially, web crawlers are responsible for understanding the content of a web page so that they can retrieve it when a request is made.

You may be wondering, “Who is running these crawlers?”

Usually web crawlers are operated by search engines with their own algorithms. The algorithm will tell the web crawler how to find relevant information in response to a search query.

A web spider will search (crawl) and categorize all of the web pages on the Internet that it can find and are asked to index. So you can tell a web crawler not to crawl your web page if you don’t want it to be found on search engines.

To do this, you need to upload a robots.txt file. Essentially, a robots.txt file will tell a search engine how to crawl and index your site’s pages.

For example, let’s take a look at Nike.com/robots.txt.

Nike used its robot.txt file to determine which links on its website would be crawled and indexed.

In this part of the record, he determined that:

  • Baiduspider web crawler was allowed to crawl the first seven links

  • Baiduspider web crawler was not allowed to crawl the remaining three links

This is beneficial to Nike because some company pages are not intended to be searched and unauthorized links will not affect its optimized pages which help them rank in search engines.

Now that we know what web crawlers are, how do they do their job? Below, let’s review how web crawlers work.

How do crawlers work?

A web crawler works by discovering URLs and examining and categorizing web pages. Along the way, they find hyperlinks to other web pages and add them to the list of pages to explore next. Web crawlers are smart and can determine the importance of each web page.

A search engine’s web crawler is unlikely to crawl the entire Internet. Rather, it will decide the importance of each web page based on factors such as the number of other pages linking to that page, page views, and even brand authority. Thus, a web crawler will determine which pages to crawl, in what order to crawl them, and how often they should crawl for updates.

Source of images

For example, if you have a new web page or if changes have been made to an existing page, the crawler will take note and update the index. Or, if you have a new web page, you can ask search engines to crawl your site.

When the web crawler is on your page, it examines the copy and meta tags, stores this information, and indexes it for Google to sort by keywords.

Before this whole process is started, the crawler will look at your robots.txt file to see which pages to crawl, which is why it’s so important for technical SEO.

Ultimately, when a web crawler crawls your page, it decides whether your page will show up on the search results page for a query. It is important to note that some web crawlers may behave differently than others. For example, some may use different factors to decide which web pages are most important to explore.

Now that we’ve seen how web crawlers work, let’s explain why they should crawl your website.

Why is website crawling important?

If you want your website to rank in search engines, it needs to be indexed. Without a crawler, your website will not be found even if you search on a paragraph directly taken from your website.

In a simple sense, your website cannot be found organically unless it is crawled once.

To find and discover links on the web through search engines, you need to give your site the opportunity to reach its intended audience by having it crawl – especially if you want to increase your organic traffic.

If the technical aspect of this is confusing, I understand. That’s why HubSpot has aWebsite Optimization Course which presents technical topics in simple language and explains how to implement your own solutions or discuss them with your web expert.

How and why to crawl your site

If your site has errors that make it hard to crawl, it could drop in SERP rankings. You work hard on your business and your content, but – as mentioned above – no one will know how awesome your site is if they can’t find it online.

Fortunately, there are exploration tools like howling frog and deep crawl that can shed light on the health of your website. Performing a site audit with a crawler tool can help you find common errors and identify issues such as:

  • Broken links: When links point to a page that no longer exists, it not only provides a bad user experience, but it can also hurt your ranking in the SERPs.

  • Duplicate content: Duplicate content on different URLs makes it difficult for Google (or other search engines) to choose the most relevant version for a user’s search query. One option to fix this is to combine them using a redirect 301.

  • Page titles: Duplicate, missing, too long, or too short title tags all affect your page rankings.

Source of images

You can’t fix problems on your site if you don’t know what they are. Using a web crawler tool takes the guesswork out of evaluating your site.

Types of web crawler tools

There are many tools on the market with various features, but they all fall into two categories:

The type of tool you use will depend on your team’s needs and budget. Generally, choosing a cloud-based option will allow for greater collaboration since the program will not need to be stored on an individual’s device.

Once installed, you can configure the crawlers to run at a given interval and generate reports as needed.

Benefits of using web crawler tools

Having your site crawled properly is essential for SEO. In addition to diagnosing site errors, the benefits of using a web crawler tool include:

1. Doesn’t affect site performance

Site crawlers run in the background and will not slow down your site while using it. They will not interfere with your daily tasks and have no effect on anyone browsing your site.

2. Built-in reports

Most crawlers have built-in reporting or analysis functionality and allow you to export these reports to an Excel spreadsheet or other formats. This feature saves you time and allows you to quickly dig deeper into your audit results.

3. Use Automation

A great feature of web crawlers is that you can set a cadence for them to crawl your site. This allows you to regularly track site performance without having to manually generate a crawl report each time.

Performing regular site audits with a crawling tool is a great way to ensure your site is healthy and ranking as it should.

Expand your reach with web crawling

Web crawlers are responsible for finding and indexing online content for search engines. They work by sorting and filtering web pages so that search engines understand what each web page is about. Understanding web crawlers is just one part of effective technical SEO that can dramatically improve your website’s performance.

This article was originally published on July 15, 2021 and has been updated for completeness.

Originally posted Feb 18, 2022 at 7:00:00 AM, updated Feb 18, 2022

Don’t forget to share this post!

]]>
What is a Web Crawler/Spider and how does it work? https://abcdirectory.org/what-is-a-web-crawler-spider-and-how-does-it-work/ Mon, 23 Aug 2021 07:00:00 +0000 https://abcdirectory.org/what-is-a-web-crawler-spider-and-how-does-it-work/ Search engines like Google are part of what makes the internet so powerful. With just a few keystrokes and the click of a button, the most relevant answers to your question appear. But have you ever wondered how search engines work? Web crawlers are part of the answer. So what is a web crawler and […]]]>

Search engines like Google are part of what makes the internet so powerful. With just a few keystrokes and the click of a button, the most relevant answers to your question appear. But have you ever wondered how search engines work? Web crawlers are part of the answer.

So what is a web crawler and how does it work?

What is an indexing robot?


funnel-web-spider-4865535_1920
Pixabay – no attribution required

When you search for something in a search engine, the engine must quickly crawl millions (or billions) of web pages to show the most relevant results. Web crawlers (also known as spiders or search engine robots) are automated programs that “crawl” the Internet and compile information about web pages in an easily accessible way.

The word “crawling” refers to the way web crawlers crawl the internet. Web crawlers are also called “spiders”. This name comes from the way they crawl the web, like how spiders crawl on their cobwebs.

Web crawlers evaluate and compile data on as many web pages as possible. They do this so that the data is easily accessible and searchable, hence its importance to search engines.

Think of a web crawler as the editor who compiles the index at the end of the book. The job of the index is to inform the reader where in the book each topic or key phrase appears. Similarly, a web crawler creates an index that a search engine uses to quickly find relevant information about a search query.

USE VIDEO OF THE DAY

What is search indexing?

As mentioned, search indexing is like compiling the index at the end of a book. In a way, indexing search is like creating a simplified map of the Internet. When someone asks a search engine a question, the search engine crawls it through its index and the most relevant pages appear first.

But how does the search engine know which pages are relevant?

Search indexing primarily focuses on two things: page text and page metadata. Text is everything you see as a reader, while metadata is information about that page entered by the page creator, called “meta tags.” Meta tags include things like page description and meta title, which show up in search results.


Search engines like Google will index all text on a webpage (except certain words like “the” and “a” in some cases). Then, when a term is looked up in the search engine, it quickly scans its index to find the most relevant page.

How does a web crawler work?


google-485611_1920
Pixabay – no attribution required

A web crawler works as the name suggests. They start with a known web page or URL and index every page at that URL (most of the time website owners ask search engines to crawl particular URLs). As they come across hyperlinks on these pages, they compile a “to-do” list of the pages they will explore next. The web crawler will continue this indefinitely, following particular rules about which pages to crawl and which to ignore.

Web crawlers do not crawl every page on the Internet. In fact, it’s estimated that only 40-70% of the internet has been indexed for search (that’s still billions of pages). Many web crawlers are designed to focus on pages that are considered more “authoritative”. Authoritative pages meet a handful of criteria that make them more likely to contain high-quality or popular information. Web crawlers should also regularly review pages as they are updated, deleted or moved.

A final factor that controls which pages a web crawler will crawl is the robots.txt protocol or robot exclusion protocol. A webpage’s server will host a robots.txt file that lays out the rules for any web crawlers or other programs accessing the page. The file will prevent certain pages from being crawled and links the crawler can follow. One of the purposes of the robots.txt file is to limit the pressure exerted by bots on the website server.

To prevent a crawler from accessing certain pages of your website, you can add the “disallow” tag via the robots.txt file or add the no index meta tag to the page in question.

What is the difference between crawl and scraping?

Web scraping is the use of bots to download data from a website without that website’s permission. Often, web scraping is used for malicious purposes. Web scraping often takes all of the HTML from specific websites, and more advanced scrapers will also take CSS and JavaScript elements. Web scraping tools can be used to quickly and easily compile information on particular topics (eg, a product listing), but can also stray into gray and illegal territory.

Web crawling, on the other hand, involves indexing information on websites with permission so that it can appear easily in search engines.

Examples of web crawlers

Every major search engine has one or more crawlers. For example:

  • Google has Googlebot
  • Bing has Bingbot
  • DuckDuckGo has DuckDuckBot.

Bigger search engines like Google have specific bots for different purposes, including Googlebot Images, Googlebot Videos, and AdsBot.

How does web crawling affect SEO?


seo-758264_1920
Pixabay – no attribution required

If you want your page to appear in search engine results, the page must be accessible to crawlers. Depending on your website’s server, you may want to allocate a particular crawling frequency, the pages the crawler crawls, and the pressure it can put on your server.

Basically, you want web crawlers to focus on content-filled pages, but not pages like thank you posts, admin pages, and internal search results.

Information at your fingertips

Using search engines has become second nature to most of us, but most of us have no idea how they work. Web crawlers are one of the main parts of an effective search engine and efficiently index information on millions of major websites every day. They are an invaluable tool for website owners, visitors and search engines.


programming-web-dev-difference
Programming vs Web Development: What’s the Difference?

You might think that application programmers and web developers do the same job, but that’s far from true. Here are the main differences between programmers and web developers.

Read more


About the Author

]]>
Alibaba falls victim to Chinese crawler in major data breach https://abcdirectory.org/alibaba-falls-victim-to-chinese-crawler-in-major-data-breach/ Tue, 15 Jun 2021 07:00:00 +0000 https://abcdirectory.org/alibaba-falls-victim-to-chinese-crawler-in-major-data-breach/ A Chinese software developer chased Alibaba Group Holding ltd. popular shopping site Taobao for eight months, surreptitiously collecting more than 1.1 billion user details before Alibaba noticed the scraping, according to a Chinese court verdict. The software developer started using web crawler software it designed on the Taobao site from November 2019, collecting information such […]]]>

A Chinese software developer chased Alibaba Group Holding ltd.

popular shopping site Taobao for eight months, surreptitiously collecting more than 1.1 billion user details before Alibaba noticed the scraping, according to a Chinese court verdict.

The software developer started using web crawler software it designed on the Taobao site from November 2019, collecting information such as user IDs, mobile phone numbers and customer feedback , according to a verdict this month from a district court in China’s central Henan province. When Alibaba noticed data leaks from Taobao, one of China’s most visited online retail sites, the company notified the police, the court heard.

A spokeswoman said Alibaba proactively discovered and addressed the incident and was working with law enforcement to protect its users. She did not specify the number of people affected. No user information was sold to a third party and no economic loss was incurred, she said. About 925 million people use Alibaba’s Chinese retail platforms at least once a month, according to the company.

Although the developer did not obtain encrypted information such as passwords, some of the data it extracted, including phone numbers and part of usernames, is not presented publicly on the website.

Chinese legal experts say a data breach involving mobile phone numbers would have greater consequences in China than in other parts of the world. In China, where people are required to register with real identification before getting a cellphone number, those numbers are considered personal information by law, said Annie Xue, a Beijing-based lawyer with the GEN law firm.

In less than six months, Chinese tech giant Ant went from planning a successful IPO to restructuring in response to central bank pressure. While the US is also targeting big tech, here’s how China is moving faster. Photo illustration: Sharon Shi

Also, Chinese consumers sign up for most internet services they use with their cell phones, and knowing a person’s cell phone number would make it easier for a bad actor to locate social media accounts and someone else’s personal information, Clement Chen said. , assistant professor of law at the University of Hong Kong.

Hangzhou-based Alibaba has been under intense scrutiny from regulators since late last year, when authorities canceled a successful initial public offering by its financial subsidiary Ant Group Co. a few days ago. before scheduled registration.

Huge consumer data leaks have become commonplace in China in recent years, as the country’s data security regulations struggle to catch up with its technological advancements. Personal information from these leaks is often sold on the black market for pennies and has sparked a nascent privacy movement among Chinese citizens.

Chinese lawmakers have pushed for more surveillance to better protect personal data. Last week, China passed a new data security law to tighten Beijing’s control over data flows within the country and improve consumer data protection. The law, along with proposed legislation modeled on the European Union’s Data Protection Regulation, aims to strengthen data rules such as the Cybersecurity Act introduced in 2017.

The Henan court filing, dated May but released this month, said the software developer, surnamed Lu, passed on the phone numbers he collected to his employer. The employer, who operated a business promoting sellers on Taobao, used the information to target customers and claim coupons from Taobao. The two were each sentenced to more than three years in prison. It is not uncommon for Chinese court rulings to be made public months after the verdict, and published rulings usually only include people’s surnames.

Although Alibaba was not blamed in the decision, the company could still face administrative penalties under the 2017 cybersecurity law, said You Yunting, senior partner at law firm Shanghai Debund. . Alibaba declined to say whether it notified users of the incident.

Since canceling Ant’s IPO, antitrust regulators have fined Alibaba a record $2.8 billion for abusing its dominant position in the country’s online retail space. and asked Ant to revamp its business to comply with regulations.

Major global tech companies, including Facebook Inc.

also had to deal with data leaks. In April, Facebook accused “malicious actors” of harvesting data including the names and phone numbers of more than 530 million users. Legal and privacy experts then said the social media company chose to describe the incidents as data scraping rather than hacking to avoid triggering laws and rules in various jurisdictions requiring companies to report breaches. data to regulators and the public.

Write to Yang Jie at jie.yang@wsj.com and Liza Lin at Liza.Lin@wsj.com

Copyright ©2022 Dow Jones & Company, Inc. All rights reserved. 87990cbe856818d5eddac44c7b1cdeb8

Appeared in the June 16, 2021 print edition as ‘Software Developer Scraped User Data From Alibaba Site’.

]]>
Elastic Announces Web Crawler for Elastic App Search and Box Support in Elastic Workplace Search https://abcdirectory.org/elastic-announces-web-crawler-for-elastic-app-search-and-box-support-in-elastic-workplace-search/ Wed, 03 Mar 2021 08:00:00 +0000 https://abcdirectory.org/elastic-announces-web-crawler-for-elastic-app-search-and-box-support-in-elastic-workplace-search/ MOUNTAIN VIEW, Calif.–(BUSINESS WIRE)–Elastic (NYSE: ESTC) (“Elastic”), the company behind Elastic Search and the Elastic stack, recently announced new features and updates in the Elastic Enterprise Search solution. Expanded features include the Elastic App Search web crawler beta, support for Box as a content source in Elastic Workplace Search, and document-level permissions for Atlassian Jira […]]]>

MOUNTAIN VIEW, Calif.–(BUSINESS WIRE)–Elastic (NYSE: ESTC) (“Elastic”), the company behind Elastic Search and the Elastic stack, recently announced new features and updates in the Elastic Enterprise Search solution. Expanded features include the Elastic App Search web crawler beta, support for Box as a content source in Elastic Workplace Search, and document-level permissions for Atlassian Jira Cloud and Confluence Cloud.

New Web crawler for Elastic App Search offers users a fast and powerful way to ingest content directly from publicly accessible websites and make that content easily searchable in their app search engines. The schema is inferred during ingestion and can be updated in near real time with a single click, all without having to write code or access the underlying data store. The introduction of the web crawler for App Search is an important step in simplifying Elastic deployments and creating new use cases for enterprise customers.

Elastic Enterprise Search now supports Box as a content source in Elastic Workplace Search, allowing teams to easily access important files. The prebuilt connector includes document-level permissions to limit user access to sensitive or private content. Adding Box already deepens strong wallet content sources available in Workplace Search, including Google Drive, Dropbox, Salesforce, Slack, ServiceNow, and Sharepoint.

Elastic Workplace Search introduces document-level permissions for Atlassian Jira Cloud and Confluence Cloud, extending granular access controls and improving source application relevance and security. The same permissions set in Jira and Confluence are synced by Workplace Search for more relevant, secure, and personalized search experiences.

For more information, read the Elastic blog at What’s new in Elastic Enterprise Search 7.11.

About Elastic:

Elastic is a free and open legacy research company. Anyone can use Elastic products and solutions to get started quickly and frictionlessly. Elastic offers three solutions for enterprise search, observability, and security, built on a technology stack that can be deployed anywhere. From document research to infrastructure monitoring to threat hunting, Elastic makes data usable in real time and at scale. Thousands of organizations around the world, including Cisco, eBay, Goldman Sachs, Microsoft, Mayo Clinic, NASA, The New York Times, Wikipedia, and Verizon, use Elastic to power mission-critical systems. Founded in 2012, Elastic is a distributed company with Elasticians around the world and is publicly traded on the NYSE under the symbol ESTC. Learn more about elastic.co.

Elastic and related marks are trademarks or registered trademarks of Elastic NV and its affiliates. All other company and product names may be trademarks of their respective owners.

]]>