G'day Elliott, welcome to the monestary,

HEAD is useful when you want information about a page, but don't actually want to see the page itself. It's most useful to check if a page exists, or when it was last modified. The biggest users of HEAD requests are proxies, which use HEAD requests to check whether or not they have a current copy of the page in their cache. If the last-modified date returned in the HEAD matches what the proxy has cached, then a whole page lookup is saved.

To access the content-type and get the content at the same time, you'll want to look at using LWP::UserAgent. In particular, the responses you get back from request method are HTTP::Response methods. You can call ->headers or ->headers_as_string to get back the headers (including content-type) as either a HTTP::Headers or as a string respectively.

A bit of sample code may help. This demonstrates how to pull back the frontpage of perlmonks.org, and prints the content type and the content retrieved. 

use LWP::UserAgent;
use HTTP::Request::Common;
my $ua = LWP::UserAgent->new;

my $response = $ua->request(GET "http://perlmonks.org/");

print "Content type is ",
      $response->headers->header("Content-Type"),
      "\n----\nContent is \n",
      $response->content;

[download]
Cheers,

Paul

In reply to When to use HEAD vs GET by pjf
in thread LWP head mystery by Anonymous Monk

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