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Diffstat (limited to '')
| -rw-r--r-- | wp-includes/class-wp-xmlrpc-server.php | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/wp-includes/class-wp-xmlrpc-server.php b/wp-includes/class-wp-xmlrpc-server.php index ae9a658..2141f21 100644 --- a/wp-includes/class-wp-xmlrpc-server.php +++ b/wp-includes/class-wp-xmlrpc-server.php @@ -6939,7 +6939,19 @@ class wp_xmlrpc_server extends IXR_Server { return $this->pingback_error( 48, __( 'The pingback has already been registered.' ) ); } - // Very stupid, but gives time to the 'from' server to publish! + /* + * The remote site may have sent the pingback before it finished publishing its own content + * containing this pingback URL. If that happens then it won't be immediately possible to fetch + * the pinging post; adding a small delay reduces the likelihood of this happening. + * + * While there are more robust methods than calling `sleep()` here (because `sleep()` merely + * mitigates the risk of requesting the remote post before it's available), this is effective + * enough for most cases and avoids introducing more complexity into this code. + * + * One way to improve the reliability of this code might be to add failure-handling to the remote + * fetch and retry up to a set number of times if it receives a 404. This could also handle 401 and + * 403 responses to differentiate the "does not exist" failure from the "may not access" failure. + */ sleep( 1 ); $remote_ip = preg_replace( '/[^0-9a-fA-F:., ]/', '', $_SERVER['REMOTE_ADDR'] ); |