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本文将展示如何配置Apache HttpClient 4和5以支持“接受所有”SSL。

目标很简单——访问没有有效证书的HTTPS URL。

SSLPeerUnverifiedException

在未配置SSL的情况下，尝试消费一个HTTPS URL时会遇到以下测试失败：

@Test
void whenHttpsUrlIsConsumed_thenException() {String urlOverHttps = "https://localhost:8082/httpclient-simple";HttpGet getMethod = new HttpGet(urlOverHttps);assertThrows(SSLPeerUnverifiedException.class, () -> {CloseableHttpClient httpClient = HttpClients.createDefault();HttpResponse response = httpClient.execute(getMethod, new CustomHttpClientResponseHandler());assertThat(response.getCode(), equalTo(200));});
}

具体的失败信息是：

javax.net.ssl.SSLPeerUnverifiedException: peer not authenticatedat sun.security.ssl.SSLSessionImpl.getPeerCertificates(SSLSessionImpl.java:397)at org.apache.http.conn.ssl.AbstractVerifier.verify(AbstractVerifier.java:126)...

当无法为URL建立有效的信任链时，就会抛出javax.net.ssl.SSLPeerUnverifiedException异常。

配置SSL - 接受所有（HttpClient 5）

现在让我们配置HTTP客户端以信任所有证书链，无论其有效性如何：

@Test
void givenAcceptingAllCertificates_whenHttpsUrlIsConsumed_thenOk() throws GeneralSecurityException, IOException {final HttpGet getMethod = new HttpGet(HOST_WITH_SSL);final TrustStrategy acceptingTrustStrategy = (cert, authType) -> true;final SSLContext sslContext = SSLContexts.custom().loadTrustMaterial(null, acceptingTrustStrategy).build();final SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslContext, NoopHostnameVerifier.INSTANCE);final Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder.<ConnectionSocketFactory> create().register("https", sslsf).register("http", new PlainConnectionSocketFactory()).build();final BasicHttpClientConnectionManager connectionManager =new BasicHttpClientConnectionManager(socketFactoryRegistry);try (CloseableHttpClient httpClient = HttpClients.custom().setConnectionManager(connectionManager).build();CloseableHttpResponse response = (CloseableHttpResponse) httpClient.execute(getMethod, new CustomHttpClientResponseHandler())) {final int statusCode = response.getCode();assertThat(statusCode, equalTo(HttpStatus.SC_OK));}
}

通过新的TrustStrategy覆盖标准证书验证过程后，测试现在可以通过，客户端能够成功消费HTTPS URL。

配置SSL - 接受所有（HttpClient 4.5）

对于HttpClient 4.5版本，配置方式类似，但使用了一些不同的API：

@Test
public final void givenAcceptingAllCertificates_whenHttpsUrlIsConsumed_thenOk()throws GeneralSecurityException {TrustStrategy acceptingTrustStrategy = (cert, authType) -> true;SSLContext sslContext = SSLContexts.custom().loadTrustMaterial(null, acceptingTrustStrategy).build();SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslContext, NoopHostnameVerifier.INSTANCE);Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder.<ConnectionSocketFactory> create().register("https", sslsf).register("http", new PlainConnectionSocketFactory()).build();BasicHttpClientConnectionManager connectionManager = new BasicHttpClientConnectionManager(socketFactoryRegistry);CloseableHttpClient httpClient = HttpClients.custom().setSSLSocketFactory(sslsf).setConnectionManager(connectionManager).build();HttpComponentsClientHttpRequestFactory requestFactory = new HttpComponentsClientHttpRequestFactory(httpClient);ResponseEntity<String> response = new RestTemplate(requestFactory).exchange(urlOverHttps, HttpMethod.GET, null, String.class);assertThat(response.getStatusCode().value(), equalTo(200));
}

Spring RestTemplate与SSL（HttpClient 5）

了解了如何配置带有SSL支持的基本HttpClient之后，我们来看看更高级别的客户端——Spring RestTemplate。

在没有配置SSL的情况下，预期的测试会失败：

@Test
void whenHttpsUrlIsConsumed_thenException() {final String urlOverHttps = "https://localhost:8443/httpclient-simple/api/bars/1";assertThrows(ResourceAccessException.class, () -> {final ResponseEntity<String> response = new RestTemplate().exchange(urlOverHttps, HttpMethod.GET, null, String.class);assertThat(response.getStatusCode().value(), equalTo(200));});
}

接下来，配置SSL来解决这个问题：

@Test
void givenAcceptingAllCertificates_whenHttpsUrlIsConsumed_thenOk() throws GeneralSecurityException {final TrustStrategy acceptingTrustStrategy = (cert, authType) -> true;final SSLContext sslContext = SSLContexts.custom().loadTrustMaterial(null, acceptingTrustStrategy).build();final SSLConnectionSocketFactory sslsf = new SSLConnectionSocketFactory(sslContext, NoopHostnameVerifier.INSTANCE);final Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder.<ConnectionSocketFactory> create().register("https", sslsf).register("http", new PlainConnectionSocketFactory()).build();final BasicHttpClientConnectionManager connectionManager = new BasicHttpClientConnectionManager(socketFactoryRegistry);final CloseableHttpClient httpClient = HttpClients.custom().setConnectionManager(connectionManager).build();final HttpComponentsClientHttpRequestFactory requestFactory =new HttpComponentsClientHttpRequestFactory(httpClient);final ResponseEntity<String> response = new RestTemplate(requestFactory).exchange(urlOverHttps, HttpMethod.GET, null, String.class);assertThat(response.getStatusCode().value(), equalTo(200));
}

这里配置方式与直接使用HttpClient非常相似，我们用带有SSL支持的请求工厂配置了RestTemplate。

结论

本教程讨论了如何配置Apache HttpClient以使其能够消费任何HTTPS URL，无论证书的有效性如何。

同样也展示了如何对Spring RestTemplate进行同样的配置。

重要的是要理解这种策略完全忽略了证书检查——这使得它不安全，仅应在合理的情况下使用。