JMeter Alter HTTP Headers During Test

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You can dynamically construct your authorization header using Beanshell PreProcessor as follows:

  1. Add empty HTTP Header Manager as a child of your request which requires authorization

  2. Add Beanshell PreProcessor as a child of the same request with the following code:

    import org.apache.jmeter.protocol.http.control.Header;

sampler.getHeaderManager().add(new Header("Authorization","Bearer " + vars.get("BEARER")));

This will construct fully dynamic header using BEARER variable.

  • sampler is a shorthand to HTTPSamplerProxy class which gives access to parent Sampler instance
  • vars is the instance of JMeterVariables class which allows read/write access to all JMeter variables available within the bounds of current context (usually current Thread Group)

See How to use BeanShell: JMeter’s favorite built-in component guide for more details on Beanshell scripting and kind of Beanshell cookbook.

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