JMeter - Run a python script before calling each HTTP request sampler

Question

I am new to Jmeter. My HTTP request sampler call looks like this

Path= /image/**image_id**/list/
Header =  \"Key\" : \"Key_Value\"

Key value is

Answer 1

You can use a BSF PreProcessor.

First download the Jython Library and save to your jmeter's lib directory.

On your HTTP sampler add a BSF PreProcessor, choose as language Jython and perform your needed magic to obtain the id, as an example I used this one:

import random
randImageString = ""
for i in range(16):
    randImageString = randImageString + chr(random.randint(ord('A'),ord('Z')))

vars.put("randimage", randImageString)

Note the vars.put("randimage",randImageString") which will insert the variable available later to jmeter.

Now on your test you can use ${randimage} when you need it:

Now every Request will be different changing with the value put to randimage on the Python Script.