PS3.18 of the DICOM Standard specifies the means whereby Web Services can be used for retrieving or storing a DICOM object.

Requests that retrieve data specify the media type (format) of the response body. Requests that store data specify the media type of the request body.

The HTTP requests as defined within this Standard are sufficient for the HTTP server to act as a DICOM SCU (Service Class User) to retrieve or store the requested objects from an appropriate DICOM SCP (Service Class Provider) using baseline DICOM functionality as defined in PS3.4 and PS3.7, which is to say that the HTTP server can act as a proxy for the DICOM SCP.