http://hl7.org/fhir/StructureDefinition/capabilitystatement-search-mode|5.2.0

Which search modes the server supports: GET, POST, or both.
{
  "description": "Which search modes the server supports: GET, POST, or both.",
  "package": "hl7.fhir.uv.extensions.r5@5.2.0",
  "date": "2014-04-12T00:00:00Z",
  "derivation": "constraint",
  "publisher": "HL7 International / FHIR Infrastructure",
  "fhirVersion": "5.0.0",
  "jurisdiction": [ {
    "coding": [ {
      "code": "001",
      "system": "http://unstats.un.org/unsd/methods/m49/m49.htm"
    } ]
  } ],
  "name": "CSSearchMode",
  "mapping": [ {
    "uri": "http://hl7.org/v3",
    "name": "RIM Mapping",
    "identity": "rim"
  } ],
  "abstract": false,
  "type": "Extension",
  "experimental": true,
  "resourceType": "StructureDefinition",
  "fhirversion": null,
  "title": "CapabilityStatement Search Mode",
  "versionAlgorithmCoding": null,
  "extension": [ {
    "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-wg",
    "valueCode": "fhir"
  }, {
    "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-fmm",
    "valueInteger": 1
  }, {
    "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-standards-status",
    "valueCode": "draft"
  }, {
    "url": "http://hl7.org/fhir/StructureDefinition/structuredefinition-type-characteristics",
    "valueCode": "can-bind"
  } ],
  "status": "draft",
  "id": "87057b49-7941-538b-a48a-a53b3c9d3ef4",
  "kind": "complex-type",
  "url": "http://hl7.org/fhir/StructureDefinition/capabilitystatement-search-mode",
  "identifier": [ {
    "value": "urn:oid:2.16.840.1.113883.4.642.5.1495",
    "system": "urn:ietf:rfc:3986"
  } ],
  "context": [ {
    "type": "element",
    "expression": "CapabilityStatement.rest.resource"
  } ],
  "versionAlgorithmString": null,
  "fhir_id": null,
  "version": "5.2.0",
  "contact": [ {
    "telecom": [ {
      "value": "http://www.hl7.org/Special/committees/fiwg",
      "system": "url"
    } ]
  } ],
  "baseDefinition": "http://hl7.org/fhir/StructureDefinition/Extension"
}