This is a HL7 FHIR server, and as you appear to be accessing this page from a web browser you are seeing a HTML version of the requested resource(s). You can also access this URL from a FHIR client as a ReSTful API call. For more details please see the HL7 FHIR specification.
{
  "resourceType": "ConceptMap",
  "id": "CareConnect-AdministrativeGender-1",
  "url": "https://fhir.hl7.org.uk/STU3/ConceptMap/CareConnect-AdministrativeGender-1",
  "version": "1.0.0",
  "name": "Concept Map - Care Connect Administrative Gender",
  "status": "active",
  "date": "2017-08-01T00:00:00+00:00",
  "publisher": "HL7 UK",
  "description": "A Concept Map from ValueSet Administrative Gender to NHS Data Dictionary Person Stated Gender to aid interpretation.",
  "copyright": "Copyright © 2016 HL7 UK",
  "sourceReference": {
    "reference": "https://fhir.hl7.org.uk/STU3/ValueSet/CareConnect-AdministrativeGender-1"
  },
  "targetReference": {
    "reference": "https://fhir.hl7.org.uk/STU3/ValueSet/CareConnect-NHSDataDictionary-PersonStatedGender-1"
  },
  "group": [
    {
      "source": "http://hl7.org/fhir/administrative-gender",
      "target": "https://fhir.hl7.org.uk/STU3/CodeSystem/CareConnect-NHSDataDictionary-PersonStatedGender-1",
      "element": [
        {
          "code": "male",
          "display": "Male",
          "target": [
            {
              "code": "1",
              "display": "Male",
              "equivalence": "equivalent"
            }
          ]
        },
        {
          "code": "female",
          "display": "Female",
          "target": [
            {
              "code": "2",
              "display": "Female",
              "equivalence": "equivalent"
            }
          ]
        },
        {
          "code": "other",
          "display": "Other",
          "target": [
            {
              "code": "9",
              "display": "Indeterminate (unable to be classified as either male or female)",
              "equivalence": "equivalent"
            }
          ]
        },
        {
          "code": "unknown",
          "display": "Unknown",
          "target": [
            {
              "code": "X",
              "display": "Not Known (not recorded)",
              "equivalence": "equivalent"
            }
          ]
        }
      ]
    }
  ]
}