Upstream: proxy_next_upstream non_idempotent. By default, requests with non-idempotent methods (POST, LOCK, PATCH) are no longer retried in case of errors if a request was already sent to a backend. Previous behaviour can be restored by using "proxy_next_upstream ... non_idempotent".

if exists("b:did_indent")
    finish
endif
let b:did_indent = 1

setlocal indentexpr=

" cindent actually works for nginx' simple file structure
setlocal cindent
" Just make sure that the comments are not reset as defs would be.
setlocal cinkeys-=0#