Perl Tutorials - Herong's Tutorial Examples - v6.01, by Dr. Herong Yang
post() Method not Following Redirect Location
This section provides a tutorial example showing that the LWP::UserAgent post() method does not follow the redirect 'Location:' header line in the HTTP response header.
Before changing our tests to play with cookies, I want to verify how the LWP::UserAgent post() method behave on HTTP redirect headers.
Let's try it with my CGI script http://localhost/CGI-pm-Redirect-URI.pl running on my local Apache Web server as described in previous tutorials.
herong> LWP-UserAgent-Post.pl http://localhost/CGI-pm-Redirect-URI.pl uri=http://localhost/hello.html POST http://localhost/CGI-pm-Redirect-URI.pl User-Agent: Mozilla/5.0 (Windows NT 6.1) Content-Length: 39 Content-Type: application/x-www-form-urlencoded uri=http%3A%2F%2Flocalhost%2Fhello.html HTTP/1.1 302 Found Connection: close Location: http://localhost/hello.html Server: Apache/2.2.25 (Win32) Content-Length: 0 Content-Type: text/plain Client-Response-Num: 1
As you can see in the output, the default behavior of LWP::UserAgent post() method does not follow the HTTP redirect header, "Location: http://localhost/hello.html" in the response header.
We need to do some research to find out how configure the post() method to follow HTTP redirects. See the next tutorial for more details.
Table of Contents
Data Types: Values and Variables
Expressions, Operations and Simple Statements
Name Spaces and Perl Module Files
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 Directories and Read File Names
File System Functions and Operations
Socket Communication Over the Internet
XML::Simple Module - XML Parser and Generator
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
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
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
Converting Perl Script to Executable Binary