# Max header length in webhook event subscription

**URL:** <https://devforum.zoom.us/t/max-header-length-in-webhook-event-subscription/125114>\
**Category:** API and Webhooks\
**Created:** [January 23, 2025, 12:52am UTC](https://devforum.zoom.us/t/max-header-length-in-webhook-event-subscription/125114 "2025-01-23T00:52:50Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![juannpmari](https://sea2.discourse-cdn.com/flex016/user_avatar/devforum.zoom.us/juannpmari/32/56979_2.png) [@juannpmari](https://devforum.zoom.us/u/juannpmari)\
**Post date:** [January 23, 2025, 12:52am UTC](https://devforum.zoom.us/t/max-header-length-in-webhook-event-subscription/125114/1 "2025-01-23T00:52:50Z")

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Hi everyone,  
I’m building an OAuth server-to-server app. I created a GCP function as webhook, and I want to subscribe it to listen to certain events coming Zoom API.  
The problem is that my function requires OAuth authentication, with a 1018 character long bearer token, while the maximum length allowed for custom headers is 256.  
How can i overcome this limitation, whithout having to modify my function’s authentication method?

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**Author:** ![system](https://us1.discourse-cdn.com/flex016/uploads/zoomdeveloper/original/3X/6/1/614bdd549b610bbaa46ff934617683a02bdaa03c.png) [@system](https://devforum.zoom.us/u/system)\
**Post date:** [January 26, 2026, 4:29pm UTC](https://devforum.zoom.us/t/max-header-length-in-webhook-event-subscription/125114/2 "2026-01-26T16:29:41Z")

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Closed on January 26, 2026, 4:29pm UTC

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