fix: expliciete SNI + HTTP/1.1 naar KVK upstream (v1.7.4)#43
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Na v1.7.3 startte nginx wel, maar requests faalden met 502 "upstream prematurely closed connection while reading response header". Root cause: sinds proxy_pass een variabele bevat ($kvk_upstream) leidt Nginx de SNI hostname (proxy_ssl_name) niet meer betrouwbaar af uit proxy_pass. KVK's load balancer ontving een TLS-handshake zonder (of met verkeerde) SNI en sloot de connectie direct na ~60ms. Fix: - proxy_ssl_name $kvk_upstream (expliciete SNI) - proxy_http_version 1.1 (moderne HTTP naar upstream) - proxy_set_header Connection "" (lege Connection zodat keep-alive werkt) Diagnose bevestigd via 4-lagentest: host curl OK, Docker-network curl OK, alleen via gateway 502 -> probleem zat 100% in nginx config. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
…1.7.4) Vangt alle recente gateway-regressies af via een contract-test op de gerenderde nginx.conf.template: - proxy_pass gebruikt $kvk_upstream variabele (runtime DNS, v1.7.2) - expliciete proxy_ssl_name voor SNI (v1.7.3) - proxy_http_version 1.1 + lege Connection header - docker resolver + envsubst placeholders fully resolved Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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Summary
proxy_ssl_name \$kvk_upstream— expliciete SNI hostname in TLS handshakeproxy_http_version 1.1+ legeConnectionheader — moderne HTTP naar upstream