AlinsRan commented on PR #13597:
URL: https://github.com/apache/apisix/pull/13597#issuecomment-4810358973
> I think both "multiple values for same header" and "same header with
multiple values - (comma separated or not)" are the same.
I don't think they're fully interchangeable. A headers.set object can't
express same-name multi-value headers at all (a JSON object can't hold two
values for one key), and emitting repeated lines is a first-class, intentional
behavior — both HTTP and the underlying OpenResty support it
(ngx.req.set_header(name, {...})). The array closes that gap.
Real headers that rely on multiple same-name fields rather than a comma list:
- Set-Cookie — non-combinable by spec.
- Cookie over HTTP/2 — carried as multiple field lines, recombined with "; "
not ",".
- gRPC metadata — a multimap; in practice grpc-go/grpc-java neither fold
duplicates nor split on commas, so ["a","b"] reaches the app as two entries and
"a,b" as one. (The gRPC spec allows folding as "semantically equivalent," but
mainstream runtimes don't, so the two forms are observably different.)
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