gistfile1.txt

curl --location --request POST 'http://localhost:8090/fhir/ValueSet/$expand' \
--header 'Content-Type: application/json' \
--data-raw '{
    "resourceType": "Parameters",
    "parameter": [
        {
            "name": "valueSet",
            "resource": {
            	"resourceType": "ValueSet",
                "compose": {
                    "include": [
                        {
                            "valueSet": "http://snomed.info/sct?fhir_vs=ecl/^ 32570581000036105 : << 263502005 = << 90734009%7CChronic%7C"
                        }
                    ]
                }
            }
        }
    ]
}'
curl --location --request POST 'https://r4.ontoserver.csiro.au/fhir/ValueSet/$expand' \
--header 'Content-Type: application/json' \
--data-raw '{
    "resourceType": "Parameters",
    "parameter": [
        {
            "name": "valueSet",
            "resource": {
            	"resourceType": "ValueSet",
                "compose": {
                    "include": [
                        {
                            "valueSet": "http://snomed.info/sct?fhir_vs=ecl/^ 32570581000036105 : << 263502005 = << 90734009%7CChronic%7C"
                        }
                    ]
                }
            }
        }
    ]
}'

As this example currently stands, it will not work within the Snowstorm due to include not containing either concept or filter. As it currently stands, it will not be able to produce a valid ECL query and will throw an error. After a recent change, POST operations are now supported via ValueSet Expansion (with/without IdType). Here is an example which illustrates that using a POST request works inside Snowstorm for VS Expansion:

curl --location --request POST 'http://localhost:8080/fhir/ValueSet/$expand' \
--header 'Content-Type: application/json' \
--data-raw '{
    "resourceType": "Parameters",
    "parameter": [
        {
            "name": "valueSet",
            "resource": {
                "resourceType": "ValueSet",
                "compose": {
                    "include": [
                        {
                            "filter": [
                                {
                                    "property": "concept",
                                    "op": "is-a",
                                    "value": "21351003"
                                }
                            ]
                        }
                    ]
                }
            }
        },
        {
            "name": "system-version",
            "valueString": "http://snomed.info/sct/900000000000207008/version/20200731"
        },
        {
            "name": "displayLanguage",
            "valueString": "en-GB"
        },
        {
            "name": "offset",
            "valueString": "0"
        },
        {
            "name": "count",
            "valueString": "10"
        }
    ]
}'