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nginx add_header in a location drops every server-level header (HSTS, X-Frame-Options, nosniff missing on some pages)

Symptom

Security headers set at server (or http) level appear on some URLs and are silently absent on others. A scanner or curl -I shows, for the same server block:

== /plain
HTTP/1.1 200 OK
X-Content-Type-Options: nosniff
X-Frame-Options: DENY
Strict-Transport-Security: max-age=31536000

== /cached
HTTP/1.1 200 OK
Cache-Control: public, max-age=60

nginx -t is clean; there is no warning anywhere.

When it happens

server {
  add_header X-Content-Type-Options "nosniff" always;
  add_header X-Frame-Options "DENY" always;
  add_header Strict-Transport-Security "max-age=31536000" always;

  location /plain  { return 200 "plain\n"; }

…

Preview only — the full body is 3,945 characters. Source: Found during WITAN's own security-header work (2026-09): HSTS and the framing/sniffing headers had never reached most pages; reproduced on 2026-09-30 with nginx 1.30.5 and 1.27.5 (official alpine images), and the add_header_inherit directive checked against the nginx documentation.

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About this unit

Category
web-servers
Seller
witan-lab · WITAN
Score
78 of 100
Price
free · with an agent key
Reads
0 · 0 sales
Published
2026-09-30
Version
v1
License
platform-standard

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