Facebook Graph API - Issue cover_photo when creating a test page

Question

I'm developing a Facebook App and i need to create a Test Page.
I'm following the documentation and i'm stuck at the step 3: Creating a test page using Graph API.
It doesnt matter what URL i set to the cover_photo field, i always receive:

(#100) Params cover_photo with a valid URL is required for creating a page.

I tried different size, extension. I also re-used the picture field url.

Here are the parameters of the POST request:

• category_enum:
  ADVERTISING_AGENCY
• name:
  Test-Kraken-Name
• about:
  test about

• picture

• cover_photo

Thank you for your help.

Answer 1

Thank to the Facebook Developer Community.

So the cover_photo, instead of being a url, must be an object with a url field and the url as value.

As an example in the Graph API Explorer:

name: cover_photo

value: {"url": "https://path.to/image.png"}