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How to correctly add a variable's value to parameters in Postman?

I'm learning Chrome Postman now and my issue now is:

I need to generate a new value of a parameter for each request.

So each request (I make a POST) must have a unique value of this parameter.

So far I thought to manage it with environment variables and I have done it like this:

  1. I add a new environment variable with a unique value
  2. I use this variable in the "value" field on a parameter

enter image description here

And it doesn't work - I get error 401 Authorization Required.

Seems that the error is not connected to the parameter at all but as soon as I change the parameter and manually input a unique data it works well!

So this will work for me:

enter image description here

Please suggest what I'm doing wrong here and advice how to do it right. Thanks!

Solution

  • Spent some more hours investigating I found my problem!

    The problem is the value I put into a variable - it included ":" sign and this sign simply changed my URL.