Set Response Headers

Summary

Set Response Headers specifies a mapping of HTTP Headers to be added globally to all managed routes and Pomerium's Authenticate Service.

How to configure

Core

Config file keys	Environment variables	Type	Default
set_response_headers	SET_RESPONSE_HEADERS	string	see Default headers

Enterprise

Configure Response Headers under Proxy settings in the Console:

Kubernetes

Name	Type	Default
set_response_headers	string	see Default headers

Set per Ingress.

Default headers

X-Content-Type-Options : nosniff,
X-Frame-Options:SAMEORIGIN,
X-XSS-Protection:1; mode=block,
Strict-Transport-Security:max-age=31536000; includeSubDomains; preload,

By default, conservative secure HTTP headers are set:

• max-age=31536000 instructs the browser to pin the certificate for a domain for a year. This helps prevent man-in-the-middle attacks, but can create issues when developing new environments with temporary certificates. See Troubleshooting - HSTS for more information.
• includeSubDomains applies these rules to subdomains, which is how individual routes are defined.
• preload instructs the browser to preload the certificate from an HSTS preload service if available. This means that the certificate can be loaded from an already-trusted secure connection, and the user never needs to connect to your domain without TLS.

See MDN Web Docs - Strict-Transport-Security for more information.

tip

Several security-related headers are not set by default since doing so might break legacy sites. These include: Cross-Origin Resource Policy, Cross-Origin Opener Policy, and Cross-Origin Embedder Policy. If possible, users are encouraged to add these to set_response_headers or their downstream applications.

Disable response headers

To disable set_response_headers:

set_response_headers:
  disable: true

Examples

Comma separated values (CSV):

X-Content-Type-Options:nosniff,X-Frame-Options:SAMEORIGIN

JSON

 '{"X-Test": "X-Value"}'

YAML

set_response_headers:
  X-Test: X-Value