Read the tutorial - https://www.callicoder.com/spring-5-reactive-webclient-webtestclient-examples/
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Create a personal access token on Github - https://github.com/settings/tokens 
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Open src/main/resources/application.propertiesand specify your github username inapp.github.usernameproperty, and your personal access token inapp.github.tokenproperty.
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Run the app using mvn spring-boot:run