This hasn't been supported by browsers in quite a while and nginx will set a warning as of Ubuntu 20.04 when the header is referenced.
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274 B
0.30.0 Migration Guide
Removals
- Support for SPDY has been removed. No major browser supports it as of 2021. Custom
nginx.conf.sigiltemplates referencing spdy-related variables will continue to build until the 1.0.0 release.