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FHIR - Feel the Fire - 1

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Jayant Singh
Jayant Singh

Feel FHIR by connecting FHIR test servers Read full article at http://www.j4jayant.com/articles/fhir/21-fhir-feel-1

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FHIR – Feel the Fire - Part 1 Jayant Singh http://www.j4jayant.com 1
Feel the Fire FHIR provides very good specification http://www.hl7.org/implement/standards/fhir/ Hands on experience on any thing helps understand it better. Connect FHIR test servers and explore FHIR - healthcare resources in RESTful environment. 2
Connect Test Servers I will discuss two approaches to connect test server Fiddler Write your own client (in C#) I will connect Grahame's test server available at http://hl7connect.healthintersections.com.au/svc/fhir/ 3
Connect using Fiddler Fiddler is simple tool which we will use to compose requests to RESTful FHIR test servers Download and install Fiddler from http://www.fiddler2.com/fiddler2/ 4
Conformance Resource - Request First step - request a conformance resource to know how an application or implementation supports FHIR. OPTIONS http://hl7connect.healthintersections.com.au/svc/fhir/ 5
Conformance Resource - Response Read the conformance carefully to understand supported FHIR resources 6
Patient Resource Feed - Request GET http://hl7connect.healthintersections.com.au/svc/fhir/patient In this request we have specified “Accept” Http header to specify content type for this request as xml 7
Patient Resource Feed - Response feed with collection of all the patient resources. Each patient resource will be inside “entry” element. Go through each element in this xml and understand it by comparing with definition available in specification 8
Patient Resource - Request GET http://hl7connect.healthintersections.com.au/svc/fhir/patient/@1 In this request we have specified “Accept” Http header to specify content type for this request as json 9
Patient Resource - Response Patient Resource Go through each element in this json and understand it by comparing with definition available in specification 10
Bad Request Try to query a resource which is not available GET http://hl7connect.healthintersections.com.au/svc/fhir/pati ent/@1123 This will return HTTP 404 Not Found status code 11
Write a Client in C# Writing your own client to query resources from test server will help you understand the FHIR & RESTful environment. Sample code provided here is written in C# and uses a library RestSharp to make RESTful request/response. 12
Sample Code //create a RestClient var client = new RestClient(); //Assign base url of RESTFul Server client.BaseUrl = txtUri.Text.Trim(); //HTTP method(GET/POST etc) to use for this request Method method = (Method)Enum.Parse((typeof(Method)), cmbHttpOptions.Text); //Create RestRequest var request = new RestRequest(method); //Add header "Accept" to request xml or json data format if (cmbContentType.Text.Equals("xml")) request.AddHeader("Accept", "application/xml"); else request.AddHeader("Accept", "application/json"); //resource to query like patient, patient/@1, document etc. request.Resource = txtResource.Text.Trim(); //Execute the request and get response IRestResponse response = client.Execute(request); //display the raw response header txtResult.Text = "************Response Header***********n"; for (int i = 0; i < response.Headers.Count; i++) txtResult.Text += response.Headers[i].Name + ": " + response.Headers[i].Value + "n"; txtResult.Text += "StatusCode: " + response.StatusCode + "n"; //display the raw response content txtResult.Text += "nn************Raw Content**********n"; 13 txtResult.Text += response.Content;
Using this client Request Patient Resource with xml response 14
Using this client Request Document Resource with json response 15
Important Try more resource URIs on your own to explore other resources http://hl7connect.healthintersections.com.au/sv c/fhir/ lists all the supported resources and their profiles Note that these servers are testing servers. They may be sporadically unavailable 16
Thank You Jayant Singh http://www.j4jayant.com 17

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FHIR - Feel the Fire - 1

  • 1. FHIR – Feel the Fire - Part 1 Jayant Singh http://www.j4jayant.com 1
  • 2. Feel the Fire FHIR provides very good specification http://www.hl7.org/implement/standards/fhir/ Hands on experience on any thing helps understand it better. Connect FHIR test servers and explore FHIR - healthcare resources in RESTful environment. 2
  • 3. Connect Test Servers I will discuss two approaches to connect test server Fiddler Write your own client (in C#) I will connect Grahame's test server available at http://hl7connect.healthintersections.com.au/svc/fhir/ 3
  • 4. Connect using Fiddler Fiddler is simple tool which we will use to compose requests to RESTful FHIR test servers Download and install Fiddler from http://www.fiddler2.com/fiddler2/ 4
  • 5. Conformance Resource - Request First step - request a conformance resource to know how an application or implementation supports FHIR. OPTIONS http://hl7connect.healthintersections.com.au/svc/fhir/ 5
  • 6. Conformance Resource - Response Read the conformance carefully to understand supported FHIR resources 6
  • 7. Patient Resource Feed - Request GET http://hl7connect.healthintersections.com.au/svc/fhir/patient In this request we have specified “Accept” Http header to specify content type for this request as xml 7
  • 8. Patient Resource Feed - Response feed with collection of all the patient resources. Each patient resource will be inside “entry” element. Go through each element in this xml and understand it by comparing with definition available in specification 8
  • 9. Patient Resource - Request GET http://hl7connect.healthintersections.com.au/svc/fhir/patient/@1 In this request we have specified “Accept” Http header to specify content type for this request as json 9
  • 10. Patient Resource - Response Patient Resource Go through each element in this json and understand it by comparing with definition available in specification 10
  • 11. Bad Request Try to query a resource which is not available GET http://hl7connect.healthintersections.com.au/svc/fhir/pati ent/@1123 This will return HTTP 404 Not Found status code 11
  • 12. Write a Client in C# Writing your own client to query resources from test server will help you understand the FHIR & RESTful environment. Sample code provided here is written in C# and uses a library RestSharp to make RESTful request/response. 12
  • 13. Sample Code //create a RestClient var client = new RestClient(); //Assign base url of RESTFul Server client.BaseUrl = txtUri.Text.Trim(); //HTTP method(GET/POST etc) to use for this request Method method = (Method)Enum.Parse((typeof(Method)), cmbHttpOptions.Text); //Create RestRequest var request = new RestRequest(method); //Add header "Accept" to request xml or json data format if (cmbContentType.Text.Equals("xml")) request.AddHeader("Accept", "application/xml"); else request.AddHeader("Accept", "application/json"); //resource to query like patient, patient/@1, document etc. request.Resource = txtResource.Text.Trim(); //Execute the request and get response IRestResponse response = client.Execute(request); //display the raw response header txtResult.Text = "************Response Header***********n"; for (int i = 0; i < response.Headers.Count; i++) txtResult.Text += response.Headers[i].Name + ": " + response.Headers[i].Value + "n"; txtResult.Text += "StatusCode: " + response.StatusCode + "n"; //display the raw response content txtResult.Text += "nn************Raw Content**********n"; 13 txtResult.Text += response.Content;
  • 14. Using this client Request Patient Resource with xml response 14
  • 15. Using this client Request Document Resource with json response 15
  • 16. Important Try more resource URIs on your own to explore other resources http://hl7connect.healthintersections.com.au/sv c/fhir/ lists all the supported resources and their profiles Note that these servers are testing servers. They may be sporadically unavailable 16
  • 17. Thank You Jayant Singh http://www.j4jayant.com 17