# Retrofit concepts in Depth

**URL:** <https://forums.kodeco.com/t/retrofit-concepts-in-depth/155852>\
**Category:** Android Apprentice\
**Created:** [November 3, 2021, 4:53pm UTC](https://forums.kodeco.com/t/retrofit-concepts-in-depth/155852 "2021-11-03T16:53:27Z")\
**Posts on this page:** 1\
**Page:** 1

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**Author:** ![pvr](https://assets.chunter.kodeco.com/user_avatar/forums.kodeco.com/pvr/32/81494_2.png) [@pvr](https://forums.kodeco.com/u/pvr)\
**Post date:** [November 3, 2021, 4:53pm UTC](https://forums.kodeco.com/t/retrofit-concepts-in-depth/155852/1 "2021-11-03T16:53:27Z")

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I want to know how to add headers dynamically.

And What is an Interceptor, could anyone let me know when to use this.