Retrieves FHIR resources from the specified provider. Supports both individual resource retrieval (e.g. Patient/123 via the path) and search operations.

FHIR search parameters are passed through to the upstream server verbatim as native query-string parameters; this proxy does not model, validate, or transform them. Append standard FHIR search parameters directly to the request URL. Supported parameters include:

• Resource-specific search parameters (e.g. name for Patient, status for Observation)
• Common search parameters (_id, _lastUpdated, _tag, _profile, _security, _text, _content, _filter)
• Result parameters (_count, _offset, _sort, _include, _revinclude, _summary, _elements)
• Search prefixes for dates, numbers, and quantities (eq, ne, gt, ge, lt, le, sa, eb, ap)

Examples:

• Patient?name=John%20Doe&_count=10&_sort=family
• Observation?patient=Patient/123&date=ge2023-01-01&category=vital-signs&_sort=-date

When using a generated SDK, supply these via the client's request-level query-parameter option (the SDK escape hatch) rather than a typed argument.

The request is proxied to the configured FHIR server with appropriate authentication headers.