check docs:
http://nginx.org/en/docs/http/ngx_http_map_module.html
every directive description has a “Context” field, where you may find
in which configuration context you can put the directive.
regarding your questions, yes, you actually have to put it on the very top - in
‘http'
context.
br,
Presently I'm putting maps in the server location. Can they be put in
the very top to make them work for all servers? If not, I can just make
the maps into include files and insert as needed, but maybe making the
map global is more efficient.
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nginx m