| Package | Description | 
|---|---|
| org.apache.hc.core5.concurrent | Core concurrency component APIs. | 
| org.apache.hc.core5.http.impl.bootstrap | HTTP/1.1 requester and server bootstrap. | 
| 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.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.http2.impl.nio | Default implementation of HTTP/2 transport based on
 the asynchronous (non-blocking) I/O model. | 
| org.apache.hc.core5.http2.impl.nio.bootstrap | HTTP/2 capable requester and server bootstrap. | 
| org.apache.hc.core5.http2.nio.command | HTTP/2 specific commands for HTTP/2 transport based
 on asynchronous, event driven I/O model. | 
| org.apache.hc.core5.http2.nio.pool | HTTP/2 specific pool component APIs. | 
| org.apache.hc.core5.pool | Client side connection pool component APIs. | 
| org.apache.hc.core5.reactive | |
| org.apache.hc.core5.reactor | Event driven network communication APIs and components loosely based on
 Doug Lea's
 reactor pattern. | 
| org.apache.hc.core5.testing.nio | 
| Class and Description | 
|---|
| BasicFuture Basic implementation of the  Futureinterface. | 
| Cancellable A  Cancellablerepresents a process or an operation that can be
 canceled. | 
| CancellableDependency This interface represents  Cancellableobject dependent on another
 ongoing process or operation. | 
| FutureCallback A callback interface that gets invoked upon completion of
 a  Future. | 
| Class and Description | 
|---|
| FutureCallback A callback interface that gets invoked upon completion of
 a  Future. | 
| Class and Description | 
|---|
| FutureCallback A callback interface that gets invoked upon completion of
 a  Future. | 
| Class and Description | 
|---|
| Cancellable A  Cancellablerepresents a process or an operation that can be
 canceled. | 
| CancellableDependency This interface represents  Cancellableobject dependent on another
 ongoing process or operation. | 
| Class and Description | 
|---|
| FutureCallback A callback interface that gets invoked upon completion of
 a  Future. | 
| Class and Description | 
|---|
| FutureCallback A callback interface that gets invoked upon completion of
 a  Future. | 
| Class and Description | 
|---|
| FutureCallback A callback interface that gets invoked upon completion of
 a  Future. | 
| Class and Description | 
|---|
| FutureCallback A callback interface that gets invoked upon completion of
 a  Future. | 
| Class and Description | 
|---|
| Cancellable A  Cancellablerepresents a process or an operation that can be
 canceled. | 
| FutureCallback A callback interface that gets invoked upon completion of
 a  Future. | 
| Class and Description | 
|---|
| Cancellable A  Cancellablerepresents a process or an operation that can be
 canceled. | 
| Class and Description | 
|---|
| FutureCallback A callback interface that gets invoked upon completion of
 a  Future. | 
| Class and Description | 
|---|
| FutureCallback A callback interface that gets invoked upon completion of
 a  Future. | 
| Class and Description | 
|---|
| FutureCallback A callback interface that gets invoked upon completion of
 a  Future. | 
| Class and Description | 
|---|
| Cancellable A  Cancellablerepresents a process or an operation that can be
 canceled. | 
| FutureCallback A callback interface that gets invoked upon completion of
 a  Future. | 
| Class and Description | 
|---|
| FutureCallback A callback interface that gets invoked upon completion of
 a  Future. | 
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