help request: "upstream sent too big header while reading response header from upstream" in Apisix Logs - 502 Bad Gateway on Browser URL

[D-Brio7]

Description

Given these configuration's in apisix helm chart in configmap.yaml to modify nginx buffer limits
large_client_header_buffers: 64 512k
client_header_buffer_size: 1050m
proxy_buffer_size: 256k
proxy_buffers: 4 256k
proxy_busy_buffers_size: 256k
client_body_buffer_size: 1050m

Below is the error snippet :-
2024/11/08 07:29:32 [error] 50#50: *101493 upstream sent too big header while reading response header from upstream, client: 172.26.134.5, server: _, request: "GET /oauth2/callback?state=eyJhbGciOiJIUzI1NiJ9.eyJhdWQiOlsidHJpbm9fb2F1dGhfdWkiXSwiZXhwIjoxNzMxMDUxODY0fQ.52_TinuNqd51GApHdP-ea5GVunKMwtlgPXUztml-BGE&session_state=9160d6f6-aa00-4178-8bd2-2c8abe26b5d1&iss=https%3A%2F%2Fdev-example.test.com%2Frealms%2Ftrino&code=6c2bf143-3a13-4c8f-b738-39eb3f7ea6d5.9160d6f6-aa00-4178-8bd2-2c8abe26b5d1.dea871b5-1073-46ce-ada0-81a79807e044 HTTP/2.0", upstream: "https://172.26.134.47:443/oauth2/callback?state=eyJhbGciOiJIUzI1NiJ9.eyJhdWQiOlsidHJpbm9fb2F1dGhfdWkiXSwiZXhwIjoxNzMxMDUxODY0fQ.52_TinuNqd51GApHdP-ea5GVunKMwtlgPXUztml-BGE&session_state=9160d6f6-aa00-4178-8bd2-2c8abe26b5d1&iss=https%3A%2F%2Fdev-keycloak.crisil.local%2Frealms%2Ftrino&code=6c2bf143-3a13-4c8f-b738-39eb3f7ea6d5.9160d6f6-aa00-4178-8bd2-2c8abe26b5d1.dea871b5-1073-46ce-ada0-81a79807e044", host: "dev-example.test.com"

Environment

• APISIX version (run apisix version): 3.11.0
• Operating system (run uname -a): Linux
• OpenResty / Nginx version (run openresty -V or nginx -V): 1.25.3.2
• etcd version, if relevant (run curl http://127.0.0.1:9090/v1/server_info): 3.5.0
• APISIX Dashboard version, if relevant:
• Plugin runner version, for issues related to plugin runners:
• LuaRocks version, for installation issues (run luarocks --version):

[D-Brio7]

closing this issue