Apache Http Client 4

  

This example demonstrates how to process HTTP responses using a response handler. This is the recommended way of executing HTTP requests and processing HTTP responses. This approach enables the caller to concentrate on the process of digesting HTTP responses and to delegate the task of system resource deallocation to HttpClient. The use of an HTTP response handler guarantees that the underlying HTTP connection will be released back to the connection manager automatically in all cases.

Client

This example demonstrates how to ensure the release of the underlying HTTP connection back to the connection manager in case of a manual processing of HTTP responses.

In this quick article, we will discuss step by step how to use Apache HttpClient 4.5 to make an HTTP POST request. The HTTP POST request method requests that the server accepts the entity enclosed in the request as a new subordinate of the web resource identified by the URI. When upgrading the dependency to version 4.4 of HttpClient, I see that all the above constants are deprecated. The deprecation note in JavaDoc mentioned to use org.apache.http.conn.ssl.DefaultHostnameVerifier. Reading the docs, I assume that DefaultHostnameVerifier is a direct replacement to STRICTHOSTNAMEVERIFIER.

This example demonstrates how to customize and configure the most common aspects of HTTP request execution and connection management.

This example demonstrates how to abort an HTTP request before its normal completion.

This example uses HttpClient to execute an HTTP request against a target site that requires user authentication.

This example demonstrates how to send an HTTP request via a proxy.

A simple example showing execution of an HTTP request over a secure connection tunneled through an authenticating proxy.

This example shows how to stream out a request entity using chunk encoding. Sophos xg1bt3hek.

Apache Http Client 4.5 Documentation

This example demonstrates the use of a local HTTP context populated custom attributes.

This example demonstrates how HttpClient can be used to perform form-based logon.

An example that executes HTTP requests from multiple worker threads.

Httpclient

This example demonstrates how to create secure connections with a custom SSL context.

This example shows how HttpClient can be customized to authenticate preemptively using BASIC scheme. Generally, preemptive authentication can be considered less secure than a response to an authentication challenge and therefore discouraged.

This example shows how HttpClient can be customized to authenticate preemptively using DIGEST scheme. Generally, preemptive authentication can be considered less secure than a response to an authentication challenge and therefore discouraged.

This example shows how to use ProxyClient in order to establish a tunnel through an HTTP proxy for an arbitrary protocol.

Client

This example shows how to execute requests enclosing a multipart encoded entity.

This example shows how to make use of Native Windows Negotiate/NTLM authentication when running on Windows OS.

The Apache HttpComponents project is responsible for creating and maintaining a toolset of low level Java components focused on HTTP and associated protocols.

This project functions under the Apache Software Foundation (http://www.apache.org), and is part of a larger community of developers and users.

HttpComponents Overview

The Hyper-Text Transfer Protocol (HTTP) is perhaps the most significant protocol used on the Internet today. Web services, network-enabled appliances and the growth of network computing continue to expand the role of the HTTP protocol beyond user-driven web browsers, while increasing the number of applications that require HTTP support.

Http

Designed for extension while providing robust support for the base HTTP protocol, the HttpComponents may be of interest to anyone building HTTP-aware client and server applications such as web browsers, web spiders, HTTP proxies, web service transport libraries, or systems that leverage or extend the HTTP protocol for distributed communication.

HttpComponents Structure

Apache

Apache Http Client 4.5 Example

HttpComponents Core

HttpCore is a set of low level HTTP transport components that can be used to build custom client and server side HTTP services with a minimal footprint. HttpCore supports two I/O models: blocking I/O model based on the classic Java I/O and non-blocking, event driven I/O model based on Java NIO.

HttpComponents Client

HttpClient is a HTTP/1.1 compliant HTTP agent implementation based on HttpCore. It also provides reusable components for client-side authentication, HTTP state management, and HTTP connection management. HttpComponents Client is a successor of and replacement for Commons HttpClient 3.x. Users of Commons HttpClient are strongly encouraged to upgrade.

Commons HttpClient (legacy)

Apache Httpclient Example

Commons HttpClient 3.x codeline is at the end of life. All users of Commons HttpClient 3.x are strongly encouraged to upgrade to HttpClient 4.1.