Fixes #410 - Retrieve title fails in multiple cases

  * `get_http_url()` renamed to `get_http_response()`.
  * Use the same HTTP context to retrieve response headers and content.
  * Follow HTTP 301 and 302 redirections to retrieve the title (default max 3 redirections).
  * Add `LinkUtils` to extract titles and charset.
  * Try to retrieve charset from HTTP headers first (new), then HTML content.
  * Use mb_string to re-encode title if necessary.

1 files changed, 10 insertions, 1 deletions

diff --git a/application/Url.php b/application/Url.php
index d80c9c58..a4ac2e73 100644..100755
--- a/application/Url.php
+++ b/application/Url.php
@@ -118,7 +118,7 @@ class Url
      */
     public function __construct($url)
     {
-        $this->parts = parse_url($url);
+        $this->parts = parse_url(trim($url));
 
         if (!empty($url) && empty($this->parts['scheme'])) {
             $this->parts['scheme'] = 'http';
@@ -201,4 +201,13 @@ class Url
         }
         return $this->parts['scheme'];
     }
+
+    /**
+     * Test if the Url is an HTTP one.
+     *
+     * @return true is HTTP, false otherwise.
+     */
+    public function isHttp() {
+        return strpos(strtolower($this->parts['scheme']), 'http') !== false;
+    }
 }