最近学习 jmeter 工具中，发现【HTTPRequest】-【Advanced】有个选项为【ClientImplementation】

1. Java
2. HTTPClient4

官网上的描述不是非常理解，不是很明白这两个选项在实际请求中各自到底有何不同，有什么办法可以验证两者之间的差异？

超级链接

There are two different test elements used to define the samplers:

• Java
  • uses the HTTP implementation provided by the JVM. This has some limitations in comparison with the HttpClient implementations - see below.
• HTTPClient4
  • uses Apache HttpComponents HttpClient 4.x.

• Blank Value

  • does not set implementation on HTTP Samplers, so relies on HTTP Request Defaults if present or on jmeter.httpsampler property defined in jmeter.properties

• The Java HTTP implementation has some limitations:

  • There is no control over how connections are re-used. When a connection is released by JMeter, it may or may not be re-used by the same thread.
  • The API is best suited to single-threaded usage - various settings are defined via system properties, and therefore apply to all connections.
  • No support of Kerberos authentication
  • It does not support client based certificate testing with Keystore Config.
  • Better control of Retry mechanism
  • It does not support virtual hosts.
  • It supports only the following methods: GET, POST, HEAD, OPTIONS, PUT, DELETE and TRACE
  • Better control on DNS Caching with DNS Cache Manager