No Cache

No Cache tells browsers and proxies not to store a response or reuse it later. Add it to account pages, dashboards and anything that shows personal data, so the back button or a shared proxy never serves a stale or private copy.

Usage

import "github.com/0mjs/zinc/middleware/nocache"

account := app.Group("/account", nocache.New())
account.Get("/settings", showSettings) // showSettings: your handler

curl -i http://localhost:8080/account/settings
# HTTP/1.1 200 OK
# Cache-Control: no-cache, no-store, max-age=0, must-revalidate
# Content-Type: application/json; charset=utf-8
# Expires: 0
# Pragma: no-cache
#
# {"email":"ada@example.com"}

Pragma and Expires cover old HTTP/1.0 caches that ignore Cache-Control.

Defaults

It always sets the three headers shown above.

Header	Value
Cache-Control	no-cache, no-store, max-age=0, must-revalidate
Pragma	no-cache
Expires	0

Configuration

There’s nothing to configure: nocache.New() takes no arguments. The headers are set before your handler runs, so a handler can still replace one with c.SetHeader.

Errors

nocache never fails a request.

Related

• Headers: sets other fixed response headers.
• Secure Headers: sets browser security headers.
• Groups and Middleware: attaching middleware to a group.