Encode strings with HPACK to produce a valid Server header for Nginx.
The Nginx source contains the Server header "nginx" when using HTTP/2:
static const u_char nginx[5] = "\x84\xaa\x63\x55\xe7";
It can be seen here: https://trac.nginx.org/nginx/browser/nginx/src/http/v2/ngx_http_v2_filter_module.c#L148
To replace this we need to HPACK encode the replacement string.
Run the script with your desired Server header as the argument, and it will output the required line of code. If you get dependency errors, it may be necessary to run 'go get golang.org/x/net/http2/hpack' first.
For example, running the script with go run encode.go 'Encrypt All The Things!!!' will output the following:
static const u_char nginx[22] = "\x95\xc1\x51\x2c\xf5\x5a\x54\x86\x8a\x14\xdf\x39\x54\xdf\x39\xaa\x99\x1f\xc7\xf1\xfc\x7f";
Replace this in the Nginx source and build.
This script is based off the StackOverflow answer provided here.