What Is LWP::UserAgent?

This section describes what is LWP::UserAgent - a Perl class that helps you to prepare a HTTP request, send it to a Web server, then receive the HTTP response from the Web server.

What Is LWP::UserAgent? LWP::UserAgent, developed by Gisle Aas, is a Perl class that helps you to prepare a HTTP request, send it to a Web server, then receive the HTTP response from the Web server.

In normal use, the application creates an LWP::UserAgent object, and then configures it with values for timeouts, proxies, name, etc. It then creates an instance of HTTP::Request for the request that needs to be performed. This request is then passed to one of the request method the UserAgent, which dispatches it using the relevant protocol, and returns a HTTP::Response object. There are convenience methods for sending the most common request types: get(), head(), post(), put() and delete().

The current version of LWP::UserAgent is 6.05, which supports the following main properties and methods:

Now let's run a simple test on the LWP::UserAgent class using the Perl command line:

C:\herong>perl -e "use LWP::UserAgent; 
   print((new LWP::UserAgent())->get('http://herongyang.com'));"

HTTP::Response=HASH(0x19f7fcc)

Great. The simple test worked and I got an HTTP::Response object. See the next tutorial on how to work with HTTP::Response objects.

Last update: 2014.

Table of Contents

 About This Book

 Perl on Linux Systems

 ActivePerl on Windows Systems

 Data Types: Values and Variables

 Expressions, Operations and Simple Statements

 User Defined Subroutines

 Perl Built-in Debugger

 Name Spaces and Perl Module Files

 Symbolic (or Soft) References

 Hard References - Addresses of Memory Objects

 Objects (or References) and Classes (or Packages)

 Typeglob and Importing Identifiers from Other Packages

 String Built-in Functions and Performance

 File Handles and Data Input/Output

 Open Files in Binary Mode

 Open Directories and Read File Names

 File System Functions and Operations

 Converting Perl Script to Executable Binary

 Using DBM Database Files

 Using MySQL Database Server

 Socket Communication Over the Internet

 XML::Simple Module - XML Parser and Generator

 XML Communication Model

 SOAP::Lite - SOAP Server-Client Communication Module

 Perl Programs as IIS Server CGI Scripts

 CGI (Common Gateway Interface)

 XML-RPC - Remote Procedure Call with XML and HTTP

 RPC::XML - Perl Implementation of XML-RPC

 Integrating Perl with Apache Web Server

 CGI.pm Module for Building Web Pages

LWP::UserAgent and Web Site Testing

What Is LWP::UserAgent?

 What Is HTTP::Response?

 What Is HTTP::Request?

 LWP-UserAgent-GET.pl - Sending a GET Request

 LWP-UserAgent-GET-Redirect.pl - Following HTTP Redirects

 http-equiv="Refresh" Meta Tag not Followed

 LWP-UserAgent-POST.pl - Posting Form Data

 post() Method not Following Redirect Location

 LWP-UserAgent-POST-Redirect.pl - Posting with Redirects

 What Is HTTP::Cookies?

 LWP-UserAgent-Request.pl - GET, POST and Cookies

 LWP-UserAgent-Request.pl - Login to facebook.com

 HTTP::Cookies save() not Saving Temporary Cookies

 LWP-UserAgent-Request-Cookies.pl - Sending Request with Cookies

 References

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