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28 lines
1 KiB
Lua
28 lines
1 KiB
Lua
function envoy_on_request(request_handle)
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local headers = request_handle:headers()
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local dynamic_meta = request_handle:streamInfo():dynamicMetadata()
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local authority = headers:get(":authority")
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-- store the authority header in the metadata so we can retrieve it in the response
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dynamic_meta:set("envoy.filters.http.lua", "request.authority", authority)
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end
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function envoy_on_response(response_handle)
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local headers = response_handle:headers()
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local dynamic_meta = response_handle:streamInfo():dynamicMetadata()
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local filter_meta = dynamic_meta:get("envoy.filters.http.lua")
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if filter_meta == nil then
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return
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end
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local authority = filter_meta["request.authority"]
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local expected_authority = "%s"
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-- if we got a 404 (no route found) and the authority header doesn't match
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-- assume we've coalesced http/2 connections and return a 421
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if headers:get(":status") == "404" and authority ~= expected_authority then
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headers:replace(":status", "421")
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end
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end
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