PackageLoaderSvc.loadPackageUrlContents() ignores system proxy settings (missing .useSystemProperties())

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Hello,

When downloading a FHIR package via URL (loadPackageUrlContents method), the HTTP request is built using an HttpClientBuilder that does not call .useSystemProperties(). As a result, standard JVM system properties (-Dhttp.proxyHost, -Dhttp.proxyPort, -Dhttps.proxyHost, -Dhttps.proxyPort, -Dhttp.nonProxyHosts, etc.) are completely ignored, and Apache HttpClient always attempts a direct connection to the target host.

In a corporate environment where outbound internet access is required to go through an HTTP proxy, this call fails with a timeout, even though the JVM proxy configuration is correct and works fine for the rest of the application.

Suggested fix

Simply add .useSystemProperties() when building the client:

ca.uhn.fhir.jpa.packages.loader.PackageLoaderSvc, method loadPackageUrlContents

HttpClientConnectionManager connManager = new BasicHttpClientConnectionManager();
try (CloseableHttpResponse request = HttpClientBuilder.create()
       .setConnectionManager(connManager)
       .useSystemProperties()
       .build()
       .execute(new HttpGet(thePackageUrl))) {
    ...

Thx for your help