Examples with DnsResolver org.apache.hc.client5.http.DnsResolver used on opensource projects

Example 1 with DnsResolver

use of org.apache.hc.client5.http.DnsResolver in project mercury by yellow013.

the class ClientConfiguration method main.

public static final void main(final String[] args) throws Exception {
    // Use custom message parser / writer to customize the way HTTP
    // messages are parsed from and written out to the data stream.
    final HttpMessageParserFactory<ClassicHttpResponse> responseParserFactory = new DefaultHttpResponseParserFactory() {

        @Override
        public HttpMessageParser<ClassicHttpResponse> create(final Http1Config h1Config) {
            final LineParser lineParser = new BasicLineParser() {

                @Override
                public Header parseHeader(final CharArrayBuffer buffer) {
                    try {
                        return super.parseHeader(buffer);
                    } catch (final ParseException ex) {
                        return new BasicHeader(buffer.toString(), null);
                    }
                }
            };
            return new DefaultHttpResponseParser(lineParser, DefaultClassicHttpResponseFactory.INSTANCE, h1Config);
        }
    };
    final HttpMessageWriterFactory<ClassicHttpRequest> requestWriterFactory = new DefaultHttpRequestWriterFactory();
    // Create HTTP/1.1 protocol configuration
    final Http1Config h1Config = Http1Config.custom().setMaxHeaderCount(200).setMaxLineLength(2000).build();
    // Create connection configuration
    final CharCodingConfig connectionConfig = CharCodingConfig.custom().setMalformedInputAction(CodingErrorAction.IGNORE).setUnmappableInputAction(CodingErrorAction.IGNORE).setCharset(StandardCharsets.UTF_8).build();
    // Use a custom connection factory to customize the process of
    // initialization of outgoing HTTP connections. Beside standard connection
    // configuration parameters HTTP connection factory can define message
    // parser / writer routines to be employed by individual connections.
    @SuppressWarnings("unused") final HttpConnectionFactory<ManagedHttpClientConnection> connFactory = new ManagedHttpClientConnectionFactory(h1Config, connectionConfig, requestWriterFactory, responseParserFactory);
    // Client HTTP connection objects when fully initialized can be bound to
    // an arbitrary network socket. The process of network socket initialization,
    // its connection to a remote address and binding to a local one is controlled
    // by a connection socket factory.
    // SSL context for secure connections can be created either based on
    // system or application specific properties.
    final SSLContext sslcontext = SSLContexts.createSystemDefault();
    // Create a registry of custom connection socket factories for supported
    // protocol schemes.
    final Registry<ConnectionSocketFactory> socketFactoryRegistry = RegistryBuilder.<ConnectionSocketFactory>create().register("http", PlainConnectionSocketFactory.INSTANCE).register("https", new SSLConnectionSocketFactory(sslcontext)).build();
    // Use custom DNS resolver to override the system DNS resolution.
    final DnsResolver dnsResolver = new SystemDefaultDnsResolver() {

        @Override
        public InetAddress[] resolve(final String host) throws UnknownHostException {
            if (host.equalsIgnoreCase("myhost")) {
                return new InetAddress[] { InetAddress.getByAddress(new byte[] { 127, 0, 0, 1 }) };
            } else {
                return super.resolve(host);
            }
        }
    };
    // Create a connection manager with custom configuration.
    final PoolingHttpClientConnectionManager connManager = new PoolingHttpClientConnectionManager(socketFactoryRegistry, PoolConcurrencyPolicy.STRICT, PoolReusePolicy.LIFO, TimeValue.ofMinutes(5), null, dnsResolver, null);
    // Create socket configuration
    final SocketConfig socketConfig = SocketConfig.custom().setTcpNoDelay(true).build();
    // Configure the connection manager to use socket configuration either
    // by default or for a specific host.
    connManager.setDefaultSocketConfig(socketConfig);
    // Validate connections after 1 sec of inactivity
    connManager.setValidateAfterInactivity(TimeValue.ofSeconds(10));
    // Configure total max or per route limits for persistent connections
    // that can be kept in the pool or leased by the connection manager.
    connManager.setMaxTotal(100);
    connManager.setDefaultMaxPerRoute(10);
    connManager.setMaxPerRoute(new HttpRoute(new HttpHost("somehost", 80)), 20);
    // Use custom cookie store if necessary.
    final CookieStore cookieStore = new BasicCookieStore();
    // Use custom credentials provider if necessary.
    final CredentialsProvider credentialsProvider = new BasicCredentialsProvider();
    // Create global request configuration
    final RequestConfig defaultRequestConfig = RequestConfig.custom().setCookieSpec(StandardCookieSpec.STRICT).setExpectContinueEnabled(true).setTargetPreferredAuthSchemes(Arrays.asList(StandardAuthScheme.NTLM, StandardAuthScheme.DIGEST)).setProxyPreferredAuthSchemes(Collections.singletonList(StandardAuthScheme.BASIC)).build();
    try (final CloseableHttpClient httpclient = HttpClients.custom().setConnectionManager(connManager).setDefaultCookieStore(cookieStore).setDefaultCredentialsProvider(credentialsProvider).setProxy(new HttpHost("myproxy", 8080)).setDefaultRequestConfig(defaultRequestConfig).build()) {
        final HttpGet httpget = new HttpGet("http://httpbin.org/get");
        // Request configuration can be overridden at the request level.
        // They will take precedence over the one set at the client level.
        final RequestConfig requestConfig = RequestConfig.copy(defaultRequestConfig).setConnectionRequestTimeout(Timeout.ofSeconds(5)).setConnectTimeout(Timeout.ofSeconds(5)).setProxy(new HttpHost("myotherproxy", 8080)).build();
        httpget.setConfig(requestConfig);
        // Execution context can be customized locally.
        final HttpClientContext context = HttpClientContext.create();
        // Contextual attributes set the local context level will take
        // precedence over those set at the client level.
        context.setCookieStore(cookieStore);
        context.setCredentialsProvider(credentialsProvider);
        System.out.println("Executing request " + httpget.getMethod() + " " + httpget.getUri());
        try (final CloseableHttpResponse response = httpclient.execute(httpget, context)) {
            System.out.println("----------------------------------------");
            System.out.println(response.getCode() + " " + response.getReasonPhrase());
            System.out.println(EntityUtils.toString(response.getEntity()));
            // Once the request has been executed the local context can
            // be used to examine updated state and various objects affected
            // by the request execution.
            // Last executed request
            context.getRequest();
            // Execution route
            context.getHttpRoute();
            // Auth exchanges
            context.getAuthExchanges();
            // Cookie origin
            context.getCookieOrigin();
            // Cookie spec used
            context.getCookieSpec();
            // User security token
            context.getUserToken();
        }
    }
}