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title2) Endpoint - the URL where the resource is found

The URL defines where the client can access the desired resources - for example the Patient resource.  

Code Block
url='http://hapi.fhir.org/baseR4/Patient'

Query String:

For GET requests, the URL may also contain any necessary query parameters like the id of the patient you are searching for.  

When using net.http.get{}, the parameters argument takes in a table of key-value pairs and automatically formats the query string. The url can also be hardcoded to handle query parameters if desired.

The   The ? indicates the end of the url and beginning of the parameters. Key-value pairs are separated by &.

Code Block
http://hapi.fhir.org/baseR4/Patient?id=12324&name=Bruce

These URLs can be hardcoded if necessary, or built using various URL Encoding strategies.

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title3) Header - the metadata providing information about the request

The header includes metadata requirements defined by the API to provide information about the request.

Code Block
headers= {
  ['Content-Type'] = 'application/fhir+json',
  ['Authorization'] = 'Bearer '..token
}

This can contain information such as: 

  • Connection and content types 

  • Authentication information like credentials, cookies, or an access token

  • MIME types

  • Entity tags (ETAGS)

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