Some mashable information sources require authentication information when they are invoked. Typically, you publish these mashables in Presto and provide default authentication credentials.

You can override the default credentials when you invoke these mashables using optional Presto headers. See Presto Headers/Parameters for more information.

You can also use these optional headers in mashup scripts. You must Construct Mashable Authentication Headers and then Invoke the Mashable with Authentication Headers. See also Adding HTTP Basic Authentication to <directinvoke> Requests.