Fix Nginx Reverse Proxy Error HTTP/2 stream 1 was not closed cleanly: PROTOCOL_ERROR (err 1)

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Fix Nginx Reverse Proxy Error HTTP/2 stream 1 was not closed cleanly: PROTOCOL_ERROR (err 1)
Photo by Clark Tibbs / Unsplash

Add this in server block

http2_max_field_size 128k;
http2_max_header_size 128k;