| auth | Required. Authentication token. |
| url | Required. Address of the page to be captured. |
| upload | If defined (it should be an URI), the captured image is uploaded to given address. If not defined, image will be returned in reply. |
| delay | Passed to cutycapt (as --delay). Default is 1000. |
| width | Passed to Xvfb (as -screen) and to cutycapt (as --min-width). Default is 800. |
| height | Passed to Xvfb (as -screen) and to cutycapt (as --min-height). Default is 600. |
| javascript | Passed to cutycapt (as --javascript). Default is "on". |
See the cutycapt homepage and Xvfb manual for more information.