Action: scan
Runs the spider against the given URL (or context). Optionally, the 'maxChildren' parameter can be set to limit the number of children scanned, the 'recurse' parameter can be used to prevent the spider from seeding recursively, the parameter 'contextName' can be used to constrain the scan to a Context and the parameter 'subtreeOnly' allows to restrict the spider under a site's subtree (using the specified 'url').