Net::HTTP - Universal base scraper with multi-page scraping support and CloudFlare bypass

Scraper overview

Net::HTTP is a universal scraper that allows solving most non-standard tasks. It can be used as a basis for scraping arbitrary content from any websites. It allows downloading page code via a link, supports multi-page scraping (pagination), automatic proxy handling, and allows checking for a successful response by code or page content.

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

Scraper use cases

🔗 REG.RU Domain Auction

Scraping the auction of expiring domains with filtering options

🔗 SSL Certificate Data

Scraping domain SSL certificate data from leaderssl.ru

🔗 Booking.com Scraping

Retrieving apartment and hotel search results from the website

🔗 Collecting Product Specifications

Example of scraping an unknown number of product specifications

🔗 Scraping IMDB Movie Database

Retrieves data for each movie and records it in the result

🔗 Checking for HTTPS Presence

Preset checks for the presence of HTTPS on a website

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)

Features

Multi-page scraping (pagination support)
Automatic proxy management
Success response verification by code or page content
Supports gzip/deflate/brotli compression
Detection and conversion of website encodings to UTF-8
CloudFlare protection bypass
Engine selection (HTTP or Chrome)
Check content option – executes a specified regular expression on the received page. If the expression fails, the page will be reloaded using a different proxy.
Use Pages option – allows iterating through a specified number of pages with a certain step. The $pagenum variable contains the current page number during iteration.
Check next page option – requires a regular expression that extracts the link to the next page (usually the "Next" button) if it exists. Navigation between pages is performed within the specified limit (0 for no limit).
Page as new query option – navigation to the next page occurs as a new request. This allows removing the limit on the number of pages to navigate.

Use cases

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

Queries

Specify page links as queries, for example:

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

Output results examples

A-Parser supports flexible result formatting thanks to the built-in Template Toolkit engine, allowing it to output results in any format, including structured formats like CSV or JSON.

Content output

Result format:

$data

Example 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 - scraper for SEO professionals</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 result:

note

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

Getting request data

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

Result format:

$response.json\n

Example 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

Query:

https://google.it

Result format:

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

Example result:

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

JSON with redirects

Result format:

$response.Redirects.json

Example 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"}]

Outputting server response status

Result format:

$reason

Example result:

OK

Server response time

Result format:

$response.Time

Example result:

1.457

Getting page size

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

Result format:

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

Example 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 Net::HTTP scraper.

Outputting H1-H6 tags

Add a regular expression (option Parse custom results) <(h\d+)[^>]+>(.+?)<\/h\d+>, in the "Parse result" field select $pages.$i.data - Page content, in the field next to the regular expression select modifiers sg. The result type will be automatically set to an array. In the "Name" field specify headers, then in "$1 to" specify tag, click on

the plus sign next to it, and in the newly appeared "$2 to" field specify content. In the general result format, specify the output $p1.headers.format('$tag - $content\n').

Download example

How to import an example into A-Parser

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tip

Collecting meta tags

Add a regex (option Parse custom results) (<meta[^>]+>), in the "Parse result" field select $pages.$i.data - Page content, in the field opposite the regex select the g modifier. The result type will automatically be set to array. 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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tip

Pagination traversal options

Using Use pages

Use pages. This function allows traversing pagination by specifying a known number of pages in advance. For example, let's take a category on a product catalog website https://www.proball.ru/catalog/myachi/. We see pagination panels at the top and bottom. When clicking on page number icons, you can see in the browser address bar how the page number parameter 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 sequential numbers into the $pagenum variable, increasing them by the value we specify.

As seen in the screenshot, the $pagenum variable is used in the appropriate place in the scraper's query format. The Use pages function will iterate through and substitute all values into the query; essentially, we will be getting links for the request:

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

where the page number will be substituted instead of the $pagenum variable, starting from 1 up to 4 with a step of 1. Thus, a traversal through the pages of the required range is achieved. This is the limitation of this method - you need to know the number of pages in the pagination in advance. Obviously, when scraping multiple categories simultaneously, the number of pages will be different everywhere, and as a workaround, we can simply specify a larger number of expected pages. But this is not entirely correct, so there is a more optimal solution, which will be discussed next.

Download example

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Using Check next page

Check next page is another function that allows organizing pagination traversal. The peculiarity of its use 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 frequently used method. However, it cannot be applied to https://www.proball.ru/catalog/myachi/ because there are no links to next pages in the code. Links there are generated by a script. Therefore, let's take the site http://www.imdb.com/search/name?gender=female as an example. There is pagination both at the beginning and at the end of the list. After looking at and analyzing the source code, you can see the presence of a link that allows moving to the next page:

in the Next page RegEx field, write the regular expression
in the Limit field, specify the number of pages to traverse

In the example, 4 is specified. By specifying a limit, we determine how many pages the scraper should traverse. In our case, 5 pages will be traversed, as the count starts from 0. If you specify a limit of 0, the scraper will work until it traverses all 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, it is possible to dynamically limit the number of pages in Use pages. To do this, you need to use Use pages and Check next page together. Let's supplement the example considered in the Use pages description and add the Check next page function to it:

These two functions work together as follows: Use pages provides the page traversal, and Check next page verifies if the next one exists. As soon as Check next page does not find a next page, scraping of this category will be stopped without waiting to complete the full count 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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Using substitution macros

Substitution macros allow implementing sequential substitution of values from a specified range.

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

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

we add substitution of values from 1 to 10 (any range can be specified) into the query itself. Thus, we get queries that provide traversal through the required number of pages, like:

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 traversal is similar to the Use pages function and has the same limitations, meaning you need to specify a specific range of values. The advantage of this method is that through substitution macros, you can substitute various values, both numeric and text, such as words or expressions. This allows us to more flexibly insert necessary parts into queries or form the queries themselves from parts that will be located 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 determining whether to increase the query level Increase (similar to the tools.query.add tool operation) or not Keep.

Download example

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CktWCLVFEUh0/MKwD1QL2S0YREZE2uDcsrEzs/Fvc8YjnPxGjE4/Csf/m3T/ibHa
lrefCsd9LhHDNoqVbrsPO69ItMUYK4/esG5u2o+yaoo8Xc9BxbZwy1nHcJYICds0
ReQiO+54BqmZkl3LcE+2qoMyDtqyp1wSJXIZmgX2ESHV1HBfDKOEMSxscPOPm2Dn
5lvJ/XRTvhoOvbW4MeivnczsamF6uZ6y0QoDhiKN2bhb3IQNmjzt47Hqpk2R4Hob
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geOM5RoWinu7Pc7LvasbLPEMkF+qt7YxtRoL1CFpCvtPgurqL0u6AK8=

Possible settings

note

Common settings for all scrapers
Common for all scrapers working via HTTP protocol

Parameter name	Default value	Description
Good status	`All`	Selection of which server response will be considered successful. If a different response is received during scraping, the request will be repeated with a different proxy
Good code RegEx		Ability to specify a regular expression to check the response code
Ban Proxy Code RegEx		Ability to ban proxies temporarily (Proxy ban time) based on the server response code
Method	`GET`	Request method
POST body		Content to be sent to the server when using the POST method. Supports variables `$query` – request URL, `$query.orig` – original query, and `$pagenum` - page number when using the Use Pages option.
Cookies		Ability to specify cookies for the request.
User agent	`_Automatically substitutes user-agent of the current Chrome version_`	User-Agent header when requesting pages
Additional headers		Ability to specify custom request headers with template engine support and using variables from the query builder
Read only headers	`☐`	Read headers only. In some cases, this saves traffic if there is no need to process content
Detect charset on content	`☐`	Detect encoding based on page content
Emulate browser headers	`☑`	Emulate browser headers
Max redirects count	`7`	Maximum number of redirects the scraper will follow
Follow common redirects	`☑`	Allows performing redirects http <-> https and www.domain <-> domain within one domain bypassing the Max redirects count limit
Max cookies count	`16`	Maximum number of cookies to save
Engine	`HTTP (Fast, JavaScript Disabled)`	Allows choosing the HTTP engine (faster, no JavaScript) or Chrome (slower, JavaScript enabled)
Chrome Headless	`☐`	If the option is enabled, the browser will not be displayed
Chrome DevTools	`☐`	Allows using Chromium debugging tools
Chrome Log Proxy connections	`☐`	If the option is enabled, information on chrome connections will be output to the log
Chrome Wait Until	`networkidle2`	Determines when the page is considered loaded. More about values.
Use HTTP/2 transport	`☐`	Determines whether to use HTTP/2 instead of HTTP/1.1. Some sites ban immediately if HTTP/1.1 is used, while others do not work via HTTP/2.
Try use HTTP/1.1 for Protocol error	`☑`	Tells the scraper to retry the request with HTTP/1.1 if HTTP/2 was enabled and a protocol error occurred (i.e., if the site does not work via HTTP/2)
Don't verify TLS certs	`☐`	Disable TLS certificate validation
Randomize TLS Fingerprint	`☐`	This option allows bypassing site bans based on TLS fingerprint
Bypass CloudFlare with Chrome	`☐`	Automatic CloudFlare check bypass
Bypass CloudFlare with Chrome Max Pages	`20`	Max number of pages when bypassing CF via Chrome
Bypass CloudFlare with Chrome Headless	`☑`	If the option is enabled, the browser will not be displayed during CF bypass via Chrome

Scraper overview​

Scraper use cases​

🔗 REG.RU Domain Auction

🔗 SSL Certificate Data

🔗 Booking.com Scraping

🔗 Collecting Product Specifications

🔗 Scraping IMDB Movie Database

🔗 Checking for HTTPS Presence

Collected data​

Features​

Use cases​

Queries​

Output results examples​

Content output​

Server response code​

Getting request data​

Getting redirects​

JSON with redirects​

Outputting server response status​

Server response time​

Getting page size​

Results processing​

Outputting H1-H6 tags​

Collecting meta tags​

Pagination traversal options​

Using Use pages​

Using Check next page​

Using substitution macros​

Using Page as query​

Possible settings​

Scraper overview

Scraper use cases

Collected data

Features

Use cases

Queries

Output results examples

Content output

Server response code

Getting request data

Getting redirects

JSON with redirects

Outputting server response status

Server response time

Getting page size

Results processing

Outputting H1-H6 tags

Collecting meta tags

Pagination traversal options

Using Use pages

Using Check next page

Using substitution macros

Using Page as query

Possible settings