在WWW :: Mechanize中直接使用`get`访问URL时，如何保持身份验证？

Question

I'm new to WWW::Mechanize but I know how to login and then how to use the follow_link method to access other pages while I'm logged in. But when I want to access a link directly that is not on the page, I lose my authentication.

Quick sample of the problem:

my $LoginURL = "http://www.website.com/user/login.jsp?";
my $DirectURL= "/Somefile?param1&param2";
$mech = WWW::Mechanize->new();
$mech->get($LoginURL);
$mech->submit_form( ... ); # fields and stuff, works fine.
$mech->get($DirectURL);    # This part fails and I'm using the direct URL.

I understand how to login and I can navigate around with the follow_link method, but when I want to access a URL that is not on the page using the get method I simply lose my authentication.

What will I have to do in order to remain authenticated when I want to access a direct URL not located on the current page?

Answer 1

Since HTTP is a stateless protocol, each request is independent of the previous one. In versions previous to HTTP 1.1, the default behavior for HTTP transactions is for a client to contact a server, send a request, and receive a response, and then both the client and server disconnect the TCP connection. If the client needs another resource on the server, it has to reestablish another TCP connection, request the resource, and disconnect. If you have successfully authenticated, the target website might "forget" that when you trying to access the next page. Try to see which value is included in the HTTP "Connection" header. It should be "keep-alive" and not "TE, close". If this is the issue try to modify the "Connection" header. You can try something like this:

  $mech->add_header(
  "Connection" => "keep-alive",
  "Keep-Alive" => "115");

Hope it helps.

Answer 2

$mech->get() is an overload of LWP::UserAgent. It expects absolute URLs.

my $uri = $mech->uri();           # Get the current URI
my $uri->path_query($DirectURL);  # Replace the path with file path
$mech->get($uri->as_string);      # Returns http://www.website.com/Somefile?param1&param2