# HttpComponents Core 4.2.4 API

Packages
org.apache.http: Core HTTP components based on the blocking I/O model.
org.apache.http.annotation: Thread-safety annotations based on JCIP-ANNOTATIONS Copyright (c) 2005 Brian Goetz and Tim Peierls.
org.apache.http.benchmark
org.apache.http.concurrent: Common concurrency components.
org.apache.http.entity: Common HTTP entity implementations.
org.apache.http.impl: Default implementations for interfaces in `org.apache.http`.
org.apache.http.impl.entity: Default implementations for interfaces in `org.apache.http.entity` and provides utility classes for serialization and deserialization of HTTP content entities.
org.apache.http.impl.io: Default implementations for interfaces in `org.apache.http.io`.
org.apache.http.impl.nio: Default implementations for interfaces in `org.apache.http.nio`.
org.apache.http.impl.nio.codecs: Default implementations for interfaces in `org.apache.http.nio.codecs`.
org.apache.http.impl.nio.pool: Basic implementations for interfaces in `org.apache.http.nio.pool`.
org.apache.http.impl.nio.reactor: Default implementations for interfaces in `org.apache.http.nio` including default I/O reactor implementations and support for SSL/TLS transport security.
org.apache.http.impl.nio.ssl: Deprecated
org.apache.http.impl.pool: Basic implementations for interfaces in `org.apache.http.pool`.
org.apache.http.io: Blocking I/O session buffer, message parser / writer interfaces.
org.apache.http.message: Basic HTTP message implementations.
org.apache.http.nio: Core HTTP components based on the non-blocking I/O model.
org.apache.http.nio.entity: Common HTTP entity implementations with extensions for asynchronous (non-blocking) data transfer.
org.apache.http.nio.params: HTTP parameters for I/O reactors based on NIO model.
org.apache.http.nio.pool: Asynchronous (non-blocking) connection pool components.
org.apache.http.nio.protocol: Asynchronous HTTP protocol handlers based on the non-blocking I/O model.
org.apache.http.nio.reactor: API for event driven NIO based on Doug Lea's reactor pattern.
org.apache.http.nio.reactor.ssl: Non-blocking TLS/SSL session implementation.
org.apache.http.nio.util: Various buffering primitives intended to facilitate content streaming for non-blocking HTTP connections.
org.apache.http.params: The parameterization framework for HTTP components.
org.apache.http.pool: Synchronous (blocking) connection pool components.
org.apache.http.protocol: HTTP protocol execution framework and synchronous HTTP protocol handlers based on the blocking I/O model.
org.apache.http.util: Resizable `byte` and `char` arrays and various utility classes with static helper methods.

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