httpclient新旧版本分割点4.3
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从这个版本开始,httpclient的api发生了一次重大调整。主要包括如下:
Release 4.3 Final ------------------- This is the first stable (GA) release of HttpClient 4.3. The most notable enhancements included in this release are: * Support for Java 7 try-with-resources for resource management (connection release.) * Added fluent Builder classes for HttpEntity, HttpRequest, HttpClient and SSLContext instances. * Deprecation of preference and configuration API based on HttpParams interface in favor of constructor injection and plain configuration objects. * Reliance on object immutability instead of access synchronization for thread safety. Several old classes whose instances can be shared by multiple request exchanges have been replaced by immutable equivalents. * DefaultHttpClient, DecompressingHttpClient, CachingHttpClient and similar classes are deprecated in favor of builder classes that produce immutable HttpClient instances. * HttpClient builders now dynamically construct a request execution pipeline tailored specifically to the user configuration by physically excluding unnecessary protocol components. * There is now an option to construct a minimal HttpClient implementation that can only execute basic HTTP message exchanges without redirects, authentication, state management or proxy support. This feature might be of particular use in web crawler development. * There is now option to avoid strict URI syntax for request URIs by executing HTTP requests with an explicitly specified target host. HttpClient will no longer attempt to parse the request URI if it does not need to extract the target host from it.
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