Book Image

Go Web Scraping Quick Start Guide

By : Vincent Smith
Book Image

Go Web Scraping Quick Start Guide

By: Vincent Smith

Overview of this book

Web scraping is the process of extracting information from the web using various tools that perform scraping and crawling. Go is emerging as the language of choice for scraping using a variety of libraries. This book will quickly explain to you, how to scrape data data from various websites using Go libraries such as Colly and Goquery. The book starts with an introduction to the use cases of building a web scraper and the main features of the Go programming language, along with setting up a Go environment. It then moves on to HTTP requests and responses and talks about how Go handles them. You will also learn about a number of basic web scraping etiquettes. You will be taught how to navigate through a website, using a breadth-first and then a depth-first search, as well as find and follow links. You will get to know about the ways to track history in order to avoid loops and to protect your web scraper using proxies. Finally the book will cover the Go concurrency model, and how to run scrapers in parallel, along with large-scale distributed web scraping.
Table of Contents (10 chapters)

Proxies

The role of a proxy is to provide an additional layer of protection on top of your system. At its core, a proxy is a server that sits in between your web scraper and the target web server, and passes communication between the two. Your web scraper sends a request to the proxy server, which then forwards the request to the website. From the point of view of the website, the request only comes from the proxy server, without any knowledge of the origin of the request. There are many types of proxy available, each with its own pros and cons

Public and shared proxies

Some proxies are open to the public to use. However, they can be shared by many different people. This jeopardizes your reliability because, if other users...