Contentserver image url Material

Hi,

Is there an easy way to get contentserver url for a material (MATNR known)

I have to call this url outside SAP in my JWD application.

I already found some examples like: C_DESK_DOC_GET_URL or SDOK_PHIO_GET_URL_FOR_GET_RFC

but none of them is working for me.

Please need some help!

Thanks