Hi, got a bit of an issue updating metadata templates (json documents) using the Box.com api with the httpcaller in FME. Specifically I have some content in Box which has some metadata associated with it and it can be updated via an api call. The call needs to be a PUT and the content type needs to be application/json-patch+json as per their documentation here.

Using the http caller there is no option to set this sort of content type in the 'Content type' selector in the httpcaller 'body' dialogue. Would be grateful for some ideas. I did try to set the content type by manually inserting into the header but this just returns an http 400 error.