Net::HTTP - A universal base scraper with support for multi-page scraping and CloudFlare bypass

Overview

Net::HTTP – is a universal scraper that allows solving most non-standard tasks. It can be used as a basis for parsing arbitrary content from any websites. It allows downloading the page code by link, supports multi-page scraping (navigation through pages), automatic work with proxies, allows you to perform a check of a successful response by code or by page content.

Go to DEMO Buy A-Parser Pro ($299)

Use cases for the scraper

🔗 REG.RU domain auction

Scraping the auction of expiring domains with the ability to filter

🔗 SSL certificate data

Scraping SSL certificate data of domains from the leaderssl.ru website

🔗 Scraping Booking.com resource

Retrieving search results for apartments and hotels on the website

🔗 Collecting product characteristics

An example of scraping an unknown number of product characteristics

🔗 Scraping the movie database from IMDB

Retrieves data about each movie and records it in the result

🔗 Checking for HTTPS presence

The preset checks for the presence of HTTPS on the site

Collected data

Content
Server response code
Server response description
Server response headers
Proxies used during the request
Array with all collected pages (used when the Use Pages option is active)

Capabilities

Multi-page scraping (navigation through pages)
Automatic work with proxies
Checking for a successful response by code or by page content
Supports gzip/deflate/brotli compression
Detection and conversion of site encodings to UTF-8
CloudFlare protection bypass
Choice of engine (HTTP or Chrome)
The Check content option – performs the specified regular expression on the received page. If the expression does not work, the page will be reloaded with another proxy.
The Use Pages option – allows you to iterate through a specified number of pages with a certain step. The variable $pagenum contains the current page number during iteration.
The Check next page option – you need to specify a regular expression that will extract the link to the next page (usually the "Forward" button), if it exists. Transition between pages is carried out within the specified limit (0 - no restrictions).
The Page as new query option – transition to the next page occurs in a new request. Allows you to remove the limitation on the number of pages for navigation.

Use cases

Downloading content
Downloading images
Checking server response code
Checking for HTTPS presence
Checking for redirects
Outputting the list of redirect URLs
Getting page size
Collecting meta tags
Extracting data from the page source code and/or headers

Requests

As requests, it is necessary to specify links to pages, for example:

http://lenta.ru/
http://a-parser.com/pages/reviews/

Output Results Examples

A-Parser supports flexible formatting of results thanks to the built-in template engine Template Toolkit, which allows it to output results in any form, as well as in structured formats, such as CSV or JSON

Content Output

Result format:

$data

Example of result:

<!DOCTYPE html><html id="XenForo" lang="ru-RU" dir="LTR" class="Public NoJs uix_javascriptNeedsInit LoggedOut Sidebar  Responsive pageIsLtr   hasTabLinks  hasSearch   is-sidebarOpen hasRightSidebar is-setWidth navStyle_0 pageStyle_0 hasFlexbox" xmlns:fb="http://www.facebook.com/2008/fbml">
<head>
  <!-- Google Tag Manager -->
  <!-- End Google Tag Manager -->
    <meta charset="utf-8" />
    <meta http-equiv="X-UA-Compatible" content="IE=Edge,chrome=1" />
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <base href="https://a-parser.com/" />
    <title>A-Parser - парсер для профессионалов SEO</title>
    <noscript><style>.JsOnly, .jsOnly { display: none !important; }</style></noscript>
    <link rel="stylesheet" href="css.php?css=xenforo,form,public,parser_icons&amp;style=9&amp;dir=LTR&amp;d=1612857138" />
    <link rel="stylesheet" href="css.php?css=facebook,google,login_bar,moderator_bar,nat_public_css,node_category,node_forum,node_list,notices,panel_scroller,resource_list_mini,sidebar_share_page,thread_list_simple,twitter,uix_extendedFooter&amp;style=9&amp;dir=LTR&amp;d=1612857138" />
    <link rel="stylesheet" href="css.php?css=uix,uix_style&amp;style=9&amp;dir=LTR&amp;d=1612857138" />

Server Response Code

Result format:

$code

Example of result:

note

The result format [% response.Redirects.0.Status || code %] allows displaying the status 301, if there are redirects in the request.

Getting Query Data

The variable $response helps to get information about the request and the server response

Result format:

$response.json\n

Example of result:

{
  "Time": 3.414,
  "connection": "keep-alive",
  "Decode": "Decode from utf-8(meta charset)",
  "cache-control": "max-age=3600,public",
  "last-modified": "Tue, 18 May 2021 12:42:56 GMT",
  "transfer-encoding": "chunked",
  "date": "Thu, 27 May 2021 14:18:42 GMT",
  "Status": 200,
  "content-encoding": "gzip",
  "Body-Length-Decoded": 1507378,
  "Reason": "OK",
  "Proxy": "http://51.255.55.144:25302",
  "content-type": "text/html",
  "Redirects": [],
  "server": "nginx",
  "Request-Raw": "GET / HTTP/1.1\r\nAccept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8\r\nAccept-Encoding: gzip, deflate, br\r\nAccept-Language: en-US,en;q=0.9\r\nConnection: keep-alive\r\nHost: a-parser.com\r\nUpgrade-Insecure-Requests: 1\r\nUser-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)\r\n\r\n",
  "URI": "https://a-parser.com/",
  "HTTPVersion": "1.1",
  "Body-Length": 299312,
  "Decode-Mode": "auto-html",
  "etag": "W/\"60a3b650-170032\"",
  "Decode-Time": 0.003,
  "IP": "remote",
  "expires": "Thu, 27 May 2021 15:18:42 GMT"
}

Getting Redirects

Request:

https://google.it

Result format:

$response.Redirects.0.URI -> $response.URI

Example of result:

https://google.it/  -> https://www.google.it/

JSON with Redirects

Result format:

$response.Redirects.json

Example of result:

[{"x-powered-by":"PleskLin","connection":"keep-alive","URI":"http://a-parser.com/","location":"https://a-parser.com/","date":"Thu, 18 Feb 2021 09:16:36 GMT","HTTPVersion":"1.1","Status":301,"content-length":"162","Reason":"Moved Permanently","Proxy":"socks5://51.255.55.144:29683","content-type":"text/html","IP":"remote","server":"nginx","Request-Raw":"GET / HTTP/1.1\r\nAccept: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8\r\nAccept-Encoding: gzip, deflate, br\r\nAccept-Language: en-US,en;q=0.9\r\nConnection: keep-alive\r\nHost: a-parser.com\r\nUpgrade-Insecure-Requests: 1\r\nUser-Agent: Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1; SV1)\r\n\r\n"}]

Server Response Status

Result format:

$reason

Example of result:

OK

Server Response Time

Result format:

$response.Time

Example of result:

1.457

Getting Page Size

As an example, the size is presented in three different options.

Result format:

[% "data-length: " _ data.length _ "\n";
"Body-Length: " _ response.${'Body-Length'} _ "\n"; 
"Body-Length-Decoded: " _ response.${'Body-Length-Decoded'} _ "\n" %]

Example of result:

data-length: 70257
Body-Length: 23167
Body-Length-Decoded: 75868

Results Processing

A-Parser allows processing results directly during scraping, in this section we have provided the most popular cases for the scraper Net::HTTP

Outputting H1-H6 Headers

Add a regex (option Use regex) <(h\d)>(.+?)<\/\1>, in the "Apply to" field select $pages.$i.data - Page content, in the field opposite the regex select modifiers sg. As the result type, an array will be automatically selected. In the "Name" field, specify headers, in "$1 to" specify tag, click the plus sign next to it and in "$2 to" specify content. In the Result Format use $p1.headers.format('$content\n').

Download example

How to import an example into A-Parser

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6pW4

tip

Collecting Meta Tags

Add a regex (option Use regex) (<meta[^>]+>), in the "Apply to" field select $pages.$i.data - Page content, in the field opposite the regex select modifier g. As the result type, an array will be automatically selected. In the "Name" field, specify meta, in "$1 to" specify item. In the Result Format use $p1.meta.format('$item\n').

Download example

How to import an example into A-Parser

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gDE=

tip

Pagination Examples

Using Use pages

Use pages. This feature allows you to navigate through pagination by specifying a known number of pages in advance. For example, let's take one of the categories on the product catalog website https://www.proball.ru/catalog/myachi/. At the top and bottom, we see the pagination panel. When clicking on the page number icons, you can see in the browser's address bar how the parameter with the page number is passed at the end of the request:

https://www.proball.ru/catalog/myachi/?PAGEN_1=1

Use pages is a kind of counter that actually substitutes the numbers in order into the variable $pagenum, increasing them by the value we specify

As seen in the screenshot, the scraper's request format uses the variable $pagenum where needed. The Use pages function will iterate and substitute all the values into the request, effectively we will be getting links for the request

https://www.proball.ru/catalog/myachi/?PAGEN_1=$pagenum

where instead of the variable $pagenum, the page number will be substituted, starting from 1 to 4 with a step of 1. Thus, it is a way to navigate through the pages of the desired range. This is the limitation of this method - you need to know in advance the number of pages in the pagination. Obviously, when parsing several categories simultaneously, the number of pages will be different everywhere, and as a solution, we can simply specify a larger number of presumed pages. But this is not quite correct, so there is a more optimal solution, which will be discussed further

Download example

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Using Сheck next page

Сheck next page is another function that allows you to organize navigation through pagination. Its distinctive feature is that to move to the next page, you need to use a regular expression that will return the link to the next page. This is a more convenient and most commonly used method. However, it cannot be applied to https://www.proball.ru/catalog/myachi/ because there are no links to the next pages in the code. The links there are generated by a script. Therefore, let's take the website http://www.imdb.com/search/name?gender=female as an example. Here, there is pagination at both the beginning and the end of the list. By looking at and analyzing the source code, you can see the presence of a link that allows you to move to the next page:

in the Next page RegEx field, write the regular expression
in the Limit field, specify the number of pages you want to navigate through

In the example, 4 is indicated. By setting a limit, we determine how many pages the scraper should navigate through. In our case, 5 pages will be navigated because the count starts from 0. If you set the limit to 0, the scraper will work until it has navigated through all the pages, regardless of their number. This is very convenient to use when you need to scrape all results from all pages

Download example

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As mentioned above, there is a possibility to dynamically limit the number of pages in Use pages. To do this, you need to use Use pages and Сheck next page together. Let's supplement the example that was considered when describing Use pages and add the Сheck next page function to it:

These two functions work together in the following way: Use pages provides navigation through the pages, and Check next page checks whether the next page exists. As soon as Check next page does not find the next page, parsing of that category will be stopped, without waiting for the passage through the entire number specified in Use pages. By combining these functions, we add efficiency to the scraper's operation, saving time and resources

Download example

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Use of substitution macros

Substitution macros allow for the sequential substitution of values from a specified range

This preset will work as follows. By specifying in the query format a template:

$query?PAGEN_1={num:1:10}

we add the substitution of values from 1 to 10 (the range can be any) into the query itself. Thus, we get queries that ensure going through the necessary number of pages, of the type:

https://www.proball.ru/catalog/myachi/?PAGEN_1=1
https://www.proball.ru/catalog/myachi/?PAGEN_1=2
...
https://www.proball.ru/catalog/myachi/?PAGEN_1=10

Using substitution macros for pagination is similar to the Use pages function and has the same limitations, that is, you need to specify a specific range of values. The advantage of this method can be considered the fact that through substitution macros you can substitute different values, both numerical and textual, for example, words or expressions. Thus, we can more flexibly insert the necessary parts into queries or form the queries themselves from parts that will be placed in different files if the task requires it

Download example

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Using Page as query

To reduce memory consumption, logic can be defined using the Page as query option. When activated, the Check next page and Use pages functions will substitute each subsequent page into queries as a separate independent query, thereby not accumulating their content in memory. Page as query also allows you to define whether to increase the level of the query Increase (similar to the operation of the tools.query.add tool), or not Keep

Download example

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lrefCsd9LhHDNoqVbrsPO69ItMUYK4/esG5u2o+yaoo8Xc9BxbZwy1nHcJYICds0
ReQiO+54BqmZkl3LcE+2qoMyDtqyp1wSJXIZmgX2ESHV1HBfDKOEMSxscPOPm2Dn
5lvJ/XRTvhoOvbW4MeivnczsamF6uZ6y0QoDhiKN2bhb3IQNmjzt47Hqpk2R4Hob
7tKc84q5FU+7EWyootVG2JFw7Ny0KQy9m+uFMARXP5/XdGSSIaqaAZtgt/azFiFD
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geOM5RoWinu7Pc7LvasbLPEMkF+qt7YxtRoL1CFpCvtPgurqL0u6AK8=

Possible settings

note

Common settings for all scrapers
Common for all scrapers working over the HTTP protocol

Overview​

Use cases for the scraper​

🔗 REG.RU domain auction

🔗 SSL certificate data

🔗 Scraping Booking.com resource

🔗 Collecting product characteristics

🔗 Scraping the movie database from IMDB

🔗 Checking for HTTPS presence

Collected data​

Capabilities​

Use cases​

Requests​

Output Results Examples​

Content Output​

Server Response Code​

Getting Query Data​

Getting Redirects​

JSON with Redirects​

Server Response Status​

Server Response Time​

Getting Page Size​

Results Processing​

Outputting H1-H6 Headers​

Collecting Meta Tags​

Pagination Examples​

Using Use pages​

Using Сheck next page​

Use of substitution macros​

Using Page as query​

Possible settings​

Overview

Use cases for the scraper

Collected data

Capabilities

Use cases

Requests

Output Results Examples

Content Output

Server Response Code

Getting Query Data

Getting Redirects

JSON with Redirects

Server Response Status

Server Response Time

Getting Page Size

Results Processing

Outputting H1-H6 Headers

Collecting Meta Tags

Pagination Examples

Using Use pages

Using Сheck next page

Use of substitution macros

Using Page as query

Possible settings