Several test elements use JMeter properties to control their behaviour.These properties are normally resolved when the class is loaded.
The sample results have various attributes (success/fail, elapsed time, data size etc.) and can be viewed in the various listeners.
This controller lets you send an FTP "retrieve file" or "upload file" request to an FTP server.
If you are going to send multiple requests to the same FTP server, consider using a FTP Request Defaults Configuration Element so you do not have to enter the same information for each FTP Request Generative Controller.
When downloading a file, it can be stored on disk (Local File) or in the Response Data, or both. This sampler lets you send an HTTP/HTTPS request to a web server.
It also lets you control whether or not JMeter parses HTML files for images and other embedded resources and sends HTTP requests to retrieve them.
The following types of embedded resource are retrieved: for details.
If you are going to send multiple requests to the same web server, consider using an HTTP Request Defaults Configuration Element so you do not have to enter the same information for each HTTP Request.
Or, instead of manually adding HTTP Requests, you may want to use JMeter's HTTP(S) Test Script Recorder to create them.
This can save you time if you have a lot of HTTP requests or requests with many parameters.