Spring RestTemplate 和代理验证

Question

我正在尝试使用 Spring 进行 REST 调用。据我了解，正确的方法是使用 RestTemplate(?)。问题是，我在代理后面。

这是我现在的代码：

SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
InetSocketAddress address = new InetSocketAddress(host, 3128);
Proxy proxy = new Proxy(Proxy.Type.HTTP, address);
factory.setProxy(proxy);

RestTemplate restTemplate = new RestTemplate();
restTemplate.setRequestFactory(factory);

似乎可行，但我需要在代理处进行身份验证，但这是如何完成的？ Proxy 类型和 SimpleClientHttpRequestFactory 类型似乎不处理凭据。没有凭据，我只会得到 407...

Answer 1

下面的代码对我有用。

RestTemplate restTemplate = new RestTemplate();

CredentialsProvider credsProvider = new BasicCredentialsProvider();
credsProvider.setCredentials( new AuthScope("proxyHost", "proxyPort"), new UsernamePasswordCredentials("proxyUser", "proxyPass") );
HttpClientBuilder clientBuilder = HttpClientBuilder.create();

clientBuilder.useSystemProperties();
clientBuilder.setProxy(new HttpHost("proxyHost", "proxyPort"));
clientBuilder.setDefaultCredentialsProvider(credsProvider);
clientBuilder.setProxyAuthenticationStrategy(new ProxyAuthenticationStrategy());

CloseableHttpClient client = clientBuilder.build();

HttpComponentsClientHttpRequestFactory factory = new HttpComponentsClientHttpRequestFactory();
factory.setHttpClient(client);

restTemplate.setRequestFactory(factory);

Answer 2

经过很多不同的选择后，我选择了下面的代码，因为能够在创建时为 RestTemplate 设置代理，因此我可以将它重构为一个单独的方法。请注意，它还有一个额外的依赖项，因此请记住这一点。

private RestTemplate createRestTemplate() throws Exception {
    final String username = "myusername";
    final String password = "myPass";
    final String proxyUrl = "proxy.nyc.bigtower.com";
    final int port = 8080;

    CredentialsProvider credsProvider = new BasicCredentialsProvider();
    credsProvider.setCredentials( 
        new AuthScope(proxyUrl, port), 
        new UsernamePasswordCredentials(username, password)
    );

    HttpHost myProxy = new HttpHost(proxyUrl, port);
    HttpClientBuilder clientBuilder = HttpClientBuilder.create();

    clientBuilder.setProxy(myProxy).setDefaultCredentialsProvider(credsProvider).disableCookieManagement();

    HttpClient httpClient = clientBuilder.build();
    HttpComponentsClientHttpRequestFactory factory = new HttpComponentsClientHttpRequestFactory();
    factory.setHttpClient(httpClient);

    return new RestTemplate(factory);
}

//我用的依赖

<dependency>
    <groupId>org.apache.httpcomponents</groupId>
    <artifactId>httpclient</artifactId>
    <version>4.5.2</version>
</dependency>
<dependency>
    <groupId>org.springframework</groupId>
    <artifactId>spring-web</artifactId>
    <version>4.2.5.RELEASE</version>
</dependency>

Answer 3

如果您的代理需要基本身份验证，您只需设置 HTTP header Proxy-Authorization 来处理身份验证：

final SimpleClientHttpRequestFactory factory = new SimpleClientHttpRequestFactory();
final InetSocketAddress address = new InetSocketAddress(host, 3128);
final Proxy proxy = new Proxy(Proxy.Type.HTTP, address);
factory.setProxy(proxy);

final String username = "Aladdin";
final String password = "open sesame";

final RestTemplate restTemplate = new RestTemplateBuilder()
    .requestFactory(() -> factory)
    .defaultHeader(HttpHeaders.PROXY_AUTHORIZATION, "Basic " + Base64.getEncoder().encodeToString((username + ':' + password).getBytes(StandardCharsets.UTF_8)))
    .build();

您不需要为此使用额外的依赖项。

Spring RestTemplate 和代理验证

Spring RestTemplate and Proxy Auth

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spring-mvc