--- /dev/null
+
+Link Checker
+------------
+
+Installation:
+
+1. Install linkchecker via Modules page.
+2. Go to Modules and enable the "Link checker" module.
+3. Go to Configuration -> Content authoring -> Link checker and enable the node types to scan.
+4. Under "Link extraction" check all HTML tags that should be scanned.
+5. Adjust the other settings if the defaults don't suit your needs.
+6. Save configuration
+7. Wait for cron to check all your links... this may take some time! :-)
+
+If links are broken they appear under Reports -> Broken links.
+
+If not, make sure cron is configured and running properly on your Drupal
+installation. The Link checker module also logs somewhat useful info about it's
+activity under Reports -> Recent log messages.
+
+
+Required:
+
+1. For internal URL extraction you need to make sure that Cron always get called
+ with your real public site URL (for e.g. http://example.com/cron.php). Make
+ sure it's never executed with http://localhost/cron.php or any other
+ hostnames or ports, not available from public. Otherwise all links may be
+ reported as broken and cannot verified as they should be.
+
+ To make sure it always works - it's required to configure the $base_url in
+ the sites settings.php with your public sites URL. Better safe than sorry!
+
+
+Known issues:
+
+There are a lot of known issues in drupal_http_request(). These have been solved
+in HTTPRL. As a workaround it's recommended to use HTTPRL in linkchecker.
+
+Issues list:
+
+* #997648: drupal_http_request() always calls fread() one more time than necessary
+* #164365-12: drupal_http_request() does handle (invalid) non-absolute redirects
+* #205969-11: drupal_http_request() assumes presence of Reason-Phrase in response Status-Line
+* #371495: Error message from drupal_http_request() not UTF8 encoded
+* #193073-11: drupal_http_request - socket not initialized
+* #106506-8: drupal_http_request() does not handle 'chunked' responses - Make it support HTTP 1.1
+* #1096890-15: drupal_http_request should return error if reaches max allowed redirects
+* #875342-21: drupal_http_request() should pick up X-Drupal-Assertion-* HTTP headers
+* #965078-31: HTTP request checking is unreliable and should be removed in favor of watchdog() calls
+* #336367: HTTP client should protect commas when folding (compatibility with legacy HTTP/1.0)
+* #45338: log fsockopen errors to watchdog