It should be | in the place of &:
api.php?action=query&titles=Albert%20Einstein&prop=images|extracts
extracts&exintro&explaintext
happens to work, because exintro
and explaintext
are not properties, but extra parameters that can be added when using prop=extracts
. To combine them all, use
api.php?action=query&titles=Albert%20Einstein&prop=images|extracts&exintro&explaintext