# CRUD Operations

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A complete overview of the RESTful API can be found [here](https://www.hl7.org/fhir/http.html).
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Primary overview of useful RESTful calls and advice on which calls to use.

In order to quickly test against the FHIR service, the [OpenAPI specifications](https://fhir-server.koppeltaal.headease.nl/fhir/api-docs) can be used. For example to create all requests with parameters in Postman.


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Perform an HTTP GET request on the current page URL with the `ask` query parameter:

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GET https://devguide.koppeltaal.nl/technische-howto/resources-managen/crud-operaties.md?ask=<question>
```

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Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.