7 calls to drupal_http_request() in Drupal 6

aggregator_refresh in modules/aggregator/aggregator.module

Checks a news feed for new items.

openid_association in modules/openid/openid.module

Attempt to create a shared secret with the OpenID Provider.

openid_discovery in modules/openid/openid.module

Perform discovery on a claimed ID to determine the OpenID provider endpoint.

openid_verify_assertion in modules/openid/openid.module

Attempt to verify the response received from the OpenID Provider.

system_check_http_request in modules/system/system.module

Checks whether the server is capable of issuing HTTP requests.

_update_refresh in modules/update/update.fetch.inc

Fetch project info via XML from a central server.

_xmlrpc in includes/xmlrpc.inc

Execute an XML remote procedural call. This is private function; call xmlrpc() in common.inc instead of this function.