more_set_headers會替換掉同名header, 避免出現兩個同名header的情況
more_set_headers 參考：https://github.com/openresty/headers-more-nginx-module#more_set_headers
syntax: more_set_headers [-t <content-type list>]... [-s <status-code list>]... <new-header>...
default: no
context: http, server, location, location if
phase: output-header-filter
Replaces (if any) or adds (if not any) the specified output headers when the response status code matches the codes specified by the -s option AND the response content type ma