JAX-RS & Alternate HTTP Client Providers
By default, the HAPI FHIR client uses the Apache HTTP Client (HC) as it's underlying HTTP provider. HC is a very powerful and efficient provider, so it is generally a good choice.
It can be replaced however by providing an alternate implementation of IRestfulClientFactory to the FhirContext.
If you are using HAPI FHIR's client in an environment where other JAX-RS clients are being used, you may want to use the JAX-RS provider instead of the Apache HC provider.
Using this provider is as simple as creating an instance and providing it to the context:
// Create a client FhirContext ctx = FhirContext.forDstu2(); // Create an instance of the JAX RS client factory and // set it on the context JaxRsRestfulClientFactory clientFactory = new JaxRsRestfulClientFactory(ctx); ctx.setRestfulClientFactory(clientFactory); // This client uses JAX-RS! IGenericClient client = ctx.newRestfulGenericClient("http://fhirtest.uhn.ca/baseDstu2");
Note that this provider is defined in the JAX-RS Server module, so you need to add the following dependency to your project in order for this to work:
<dependency> <groupId>ca.uhn.hapi.fhir</groupId> <artifactId>hapi-fhir-jaxrsserver-base</artifactId> <version>[version]</version> </dependency>