HTTP/2: precalculate hash for "Cookie".
HTTP/2: precalculate hash for "Cookie".

There is no need to calculate hashes of static strings at runtime.  The
ngx_hash() macro can be used to do it during compilation instead, similarly
to how it is done in ngx_http_proxy_module.c for "Server" and "Date" headers.

hy0kl/nginx,hy0kl/nginx,hy0kl/nginx