How to make async http request from jmeter while changing path dynamically before each call

Question

Following are the steps that I need to peform

1. Make http request call to a sevice which returns a json that has many urls.
2. Extract all the urls using regular expression extractor
3. Make http request call to all the exctracted urls asynchronously.

Is there a way we can achieve this? I tried parallel controller but, if I am not wrong, it requires all the request to be mentioned as its child sampler. I don't want to write each and every request manually. Is there a way we can change urls dynamically after running the test plan?

Answer 1

1. It's better to use JSON Extractor if the server returns URLs in JSON format

2. Once you have the URLs in form of JMeter Variables like:

   url_1=http://example.com
   url_2=http://example.org
   ........
   ........
   url_matchNr=X
   

   • add Parallel Sampler to your Test Plan

   • add JSR223 PreProcessor as a child of the Parallel Sampler

   • Put the following code into "Script" area:

      1.upto(vars.get('url_matchNr') as int, { index ->
          sampler.addURL(vars.get('url_' + index))
      })