Orthanc is designed as a lightweight service for medical imaging, where the word service must be understood in the sense of service-oriented architectures. External software can interact with the Orthanc service through the REST API of Orthanc, so as to build higher-level applications that make use of DICOM.
We have deliberately decided not to include any mechanism to bypass the same-origin policy (CORS) into the core of Orthanc. By this choice, we hope to force clean Web designs, which is especially important for medical applications. To circumvent the same-origin policy, you have three choices: