Why “Invalid Content Type”

Question

Trying to update a data field on a lead record in Marketo. Using C#. I send:

{\"action\":\"updateOnly\",\"input\":[{\"email\":\"dfranks@gm         


        

Answer 1

Content-Type is a HTTP header. Usually, you set it to application/json for REST calls.

You should do this in the code where you generate the HTTP request or REST call.

I found text/json as Content-Type and Accept header value in one of the marketo examples. You might try one of the two choices.

Answer 2

Here are a couple of things to check:

1. As @StephenKing mentioned, I would check that your Content-Type HTTP Header is set to "application/json".

2. I would also confirm that the custom field you created for "leadQuality" has a String data type.