Spring Boot offers a number of starters that work with HTTP clients. This section answers questions related to using them.
As described in Section 34.1, “RestTemplate Customization”,
you can use a RestTemplateCustomizer
with RestTemplateBuilder
to build a customized
RestTemplate
. This is the recommended approach for creating a RestTemplate
configured
to use a proxy.
The exact details of the proxy configuration depend on the underlying client request
factory that is being used. The following example configures
HttpComponentsClientRequestFactory
with an HttpClient
that uses a proxy for all hosts
except 192.168.0.5
:
static class ProxyCustomizer implements RestTemplateCustomizer { @Override public void customize(RestTemplate restTemplate) { HttpHost proxy = new HttpHost("proxy.example.com"); HttpClient httpClient = HttpClientBuilder.create() .setRoutePlanner(new DefaultProxyRoutePlanner(proxy) { @Override public HttpHost determineProxy(HttpHost target, HttpRequest request, HttpContext context) throws HttpException { if (target.getHostName().equals("192.168.0.5")) { return null; } return super.determineProxy(target, request, context); } }).build(); restTemplate.setRequestFactory( new HttpComponentsClientHttpRequestFactory(httpClient)); } }