Service Integration

public class UrlConnectionSdkHttpService implements SdkHttpService {
    public SdkHttpClient.Builder createHttpClientBuilder();
}

import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.regions.Region;

// The AWS SDK will automatically find and can use UrlConnectionHttpClient
S3Client s3 = S3Client.builder()
    .region(Region.US_EAST_1)
    .build();
// If no other HTTP client is on the classpath, UrlConnectionHttpClient will be used

software.amazon.awssdk.http.urlconnection.UrlConnectionSdkHttpService

import software.amazon.awssdk.http.urlconnection.UrlConnectionHttpClient;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.dynamodb.DynamoDbClient;
import software.amazon.awssdk.regions.Region;
import java.time.Duration;

// Configure S3 client with UrlConnectionHttpClient
S3Client s3Client = S3Client.builder()
    .httpClient(UrlConnectionHttpClient.builder()
        .connectionTimeout(Duration.ofSeconds(10))
        .socketTimeout(Duration.ofSeconds(30))
        .build())
    .region(Region.US_WEST_2)
    .build();

// Configure DynamoDB client
DynamoDbClient dynamoClient = DynamoDbClient.builder()
    .httpClient(UrlConnectionHttpClient.create())
    .region(Region.US_EAST_1)
    .build();

import software.amazon.awssdk.http.urlconnection.UrlConnectionHttpClient;
import software.amazon.awssdk.http.urlconnection.ProxyConfiguration;
import software.amazon.awssdk.http.SdkHttpClient;
import software.amazon.awssdk.services.s3.S3Client;
import software.amazon.awssdk.services.ec2.EC2Client;
import software.amazon.awssdk.regions.Region;
import java.time.Duration;

// Configure HTTP client to be shared across multiple AWS service clients
SdkHttpClient sharedHttpClient = UrlConnectionHttpClient.builder()
    .connectionTimeout(Duration.ofSeconds(15))
    .socketTimeout(Duration.ofSeconds(60))
    .proxyConfiguration(ProxyConfiguration.builder()
        .useSystemPropertyValues(true)
        .build())
    .build();

// Use the shared client across multiple services
S3Client s3 = S3Client.builder()
    .httpClient(sharedHttpClient)
    .region(Region.US_WEST_2)
    .build();

EC2Client ec2 = EC2Client.builder()
    .httpClient(sharedHttpClient)
    .region(Region.US_WEST_2)
    .build();

// Remember to close the shared client when done
// sharedHttpClient.close(); // Note: This is actually a no-op for UrlConnectionHttpClient

// Optimized for high-throughput operations
SdkHttpClient highThroughputClient = UrlConnectionHttpClient.builder()
    .socketTimeout(Duration.ofMinutes(5))     // Longer timeout for large uploads
    .connectionTimeout(Duration.ofSeconds(10))
    .build();

S3Client s3 = S3Client.builder()
    .httpClient(highThroughputClient)
    .region(Region.US_EAST_1)
    .build();

// Optimized for low-latency operations
SdkHttpClient lowLatencyClient = UrlConnectionHttpClient.builder()
    .connectionTimeout(Duration.ofSeconds(3))
    .socketTimeout(Duration.ofSeconds(10))
    .build();

DynamoDbClient dynamodb = DynamoDbClient.builder()
    .httpClient(lowLatencyClient)
    .region(Region.US_EAST_1)
    .build();

// Enterprise configuration with proxy and custom TLS
SdkHttpClient enterpriseClient = UrlConnectionHttpClient.builder()
    .connectionTimeout(Duration.ofSeconds(30))
    .socketTimeout(Duration.ofMinutes(2))
    .proxyConfiguration(ProxyConfiguration.builder()
        .endpoint(URI.create("http://corporate-proxy.company.com:8080"))
        .username("domain\\serviceaccount")
        .password("password")
        .nonProxyHosts(Set.of("*.internal.company.com", "localhost"))
        .build())
    .tlsTrustManagersProvider(TlsTrustManagersProvider.fileStore(
        Paths.get("/etc/ssl/corporate-ca.jks"), "password"))
    .build();

// Use with multiple AWS services
S3Client s3 = S3Client.builder()
    .httpClient(enterpriseClient)
    .region(Region.US_EAST_1)
    .build();

SecretsManagerClient secrets = SecretsManagerClient.builder()
    .httpClient(enterpriseClient)
    .region(Region.US_EAST_1)
    .build();

// Simple Lambda function with minimal cold start time
public class SimpleS3Handler implements RequestHandler<S3Event, String> {
    
    private static final S3Client s3Client = S3Client.builder()
        .httpClient(UrlConnectionHttpClient.create())  // Minimal overhead
        .build();
    
    @Override
    public String handleRequest(S3Event event, Context context) {
        // Handle S3 events with minimal dependencies
        return "Success";
    }
}

// Apache HTTP Client (more features, better performance for high volume)
SdkHttpClient apacheClient = ApacheHttpClient.builder()
    .maxConnections(100)
    .build();

// Netty HTTP Client (async support, better for reactive applications)  
SdkHttpClient nettyClient = NettyNioAsyncHttpClient.builder()
    .maxConcurrency(50)
    .build();

// Main service interface
public interface SdkHttpService {
    SdkHttpClient.Builder createHttpClientBuilder();
}

// URL Connection implementation
public class UrlConnectionSdkHttpService implements SdkHttpService {
    @Override
    public SdkHttpClient.Builder createHttpClientBuilder() {
        return UrlConnectionHttpClient.builder();
    }
}

import org.junit.jupiter.api.Test;
import software.amazon.awssdk.http.urlconnection.UrlConnectionHttpClient;

@Test
void testS3Integration() {
    // Use UrlConnectionHttpClient in tests for simplicity
    S3Client s3Client = S3Client.builder()
        .httpClient(UrlConnectionHttpClient.builder()
            .connectionTimeout(Duration.ofSeconds(5))
            .socketTimeout(Duration.ofSeconds(10))
            .build())
        .region(Region.US_EAST_1)
        .credentialsProvider(StaticCredentialsProvider.create(
            AwsBasicCredentials.create("test", "test")))
        .endpointOverride(URI.create("http://localhost:9000"))  // LocalStack or mock
        .build();

    // Test S3 operations
    ListBucketsResponse response = s3Client.listBuckets();
    assertThat(response.buckets()).isNotNull();
    
    s3Client.close();
}

// Service provider interface
public interface SdkHttpService {
    SdkHttpClient.Builder createHttpClientBuilder();
}

// URL Connection service implementation
public class UrlConnectionSdkHttpService implements SdkHttpService {
    public SdkHttpClient.Builder createHttpClientBuilder();
}

// Core HTTP client interface (from AWS SDK)
public interface SdkHttpClient extends Closeable {
    ExecutableHttpRequest prepareRequest(HttpExecuteRequest request);
    String clientName();
    void close();
    
    interface Builder<B extends Builder<B>> {
        SdkHttpClient buildWithDefaults(AttributeMap serviceDefaults);
    }
}