| Package | Description | 
|---|---|
| org.apache.hc.core5.annotation | Provides annotations for public interface definitions | 
| org.apache.hc.core5.concurrent | Core concurrency component APIs. | 
| org.apache.hc.core5.function | Commonly used functional interfaces. | 
| org.apache.hc.core5.http | Core HTTP transport component APIs. | 
| org.apache.hc.core5.http.config | Core configuration APIs. | 
| org.apache.hc.core5.http.impl | Default implementations of core HTTP APIs. | 
| org.apache.hc.core5.http.impl.bootstrap | HTTP/1.1 requester and server bootstrap. | 
| org.apache.hc.core5.http.impl.io | Default implementation of HTTP/1.1 transport based on the classic
 (blocking) I/O model. | 
| org.apache.hc.core5.http.impl.nio | Default implementation of HTTP/1.1 transport based on
 the asynchronous (non-blocking) I/O model. | 
| org.apache.hc.core5.http.impl.routing | |
| org.apache.hc.core5.http.io | Core HTTP transport APIs based on the classic (blocking) I/O model. | 
| org.apache.hc.core5.http.io.entity | HTTP message entity APIs based on the classic (blocking) I/O model. | 
| org.apache.hc.core5.http.io.ssl | |
| org.apache.hc.core5.http.io.support | Support classes for the classic (blocking) I/O model. | 
| org.apache.hc.core5.http.message | Core HTTP message components, message element parser
 and writer APIs and their default implementations. | 
| org.apache.hc.core5.http.nio | Core HTTP transport APIs based on the asynchronous, event driven I/O model. | 
| org.apache.hc.core5.http.nio.command | Commands for HTTP transports based on asynchronous, event driven I/O model. | 
| org.apache.hc.core5.http.nio.entity | HTTP message entity APIs based on the asynchronous (non-blocking) I/O model. | 
| org.apache.hc.core5.http.nio.ssl | TLS protocol support. | 
| org.apache.hc.core5.http.nio.support | Support classes for the asynchronous I/O model. | 
| org.apache.hc.core5.http.nio.support.classic | Support classes for the asynchronous I/O model that emulate
 behavior of the classic (blocking) I/O model. | 
| org.apache.hc.core5.http.protocol | Core HTTP protocol interceptors. | 
| org.apache.hc.core5.http.ssl | |
| org.apache.hc.core5.http.support | |
| org.apache.hc.core5.io | Core I/O component APIs and utilities. | 
| org.apache.hc.core5.net | Core network component APIs and utilities. | 
| org.apache.hc.core5.pool | Client side connection pool component APIs. | 
| org.apache.hc.core5.reactor | Event driven network communication APIs and components loosely based on
 Doug Lea's
 reactor pattern. | 
| org.apache.hc.core5.reactor.ssl | TLS/SSL support for I/O reactors. | 
| org.apache.hc.core5.ssl | Utility classes for trust and key material management
 and TLS/SSL context initialization. | 
| org.apache.hc.core5.util | Core utility classes. | 
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