Thanks for this information. Unfortunately, I cannot get any of the calls with various combinations of POST syntax I've tried to work. Are there any examples of asynchronous calls on a windows installation of orthanc? If none of the syntax works, does this mean I don't have the rest API installed properly? For example -X POST generates syntax errors, but -Method POST seems to be acceptable syntax, it just still fails to recognize/understand the '{"synchronous":false}' part.
StatusCode : 200
StatusDescription : OK
Content : [
"256e56b0-1c5f-4028-b234-0df5caf0422e",
"4d56d295-feca-493d-bdc2-99b25bd7e483",
"58f6df68-02f6-47ab-b193-a4f657d38592",
"65040f25-6b6b-4148-8021-3dfbbd37b38b",
"6fa10c96-20d6-4fe9-a9c...
RawContent : HTTP/1.1 200 OK
Connection: keep-alive
Content-Length: 433
Content-Type: application/json; charset=utf-8
[
"256e56b0-1c5f-4028-b234-0df5caf0422e",
"4d56d295-feca-493d-bdc2-99b25bd7e483",
...
Forms : {}
Headers : {[Connection, keep-alive], [Content-Length, 433], [Content-Type, application/json; charset=utf-8]}
Images : {}
InputFields : {}
Links : {}
ParsedHtml : System.__ComObject
RawContentLength : 433
---
and I can make more detailed calls like
StatusCode : 200
StatusDescription : OK
Content : {
"CompletionTime" : "20190509T195858.384467",