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Put the bypass in Varnish’s vcl_recv subroutine and return pass for WordPress administration, login, and preview requests. Varnish already passes requests carrying Cookie or Authorization headers, so authenticated sessions normally avoid shared cache objects. The explicit URL rules protect the administration paths even when a host, plugin, CDN, or custom VCL changes the defaults.
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What the bypass does
Varnish sits between the browser and WordPress. For a cacheable public request, it can serve an existing object without contacting PHP or the origin server. That optimization is unsafe for administrative and personalized responses: a dashboard, preview, account fragment, or logged-in front-end page can contain user-specific data.
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A VCL return (pass) changes the request path. Varnish sends the request to the backend without looking up a shared cache object. The official Varnish wording is precise: requests that end up in vcl_pass bypass the cache and result in an uncacheable backend fetch.
The bypass does not disable caching for the whole site. Anonymous pages can remain cacheable while administration, authentication, previews, and authenticated requests go directly to WordPress.
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Varnish’s default protection for logged-in sessions
Varnish’s built-in VCL contains a rule equivalent to:
if (req.http.Authorization || req.http.Cookie) {
return (pass);
}That means any request with an Authorization header or a Cookie header is passed by default. A logged-in WordPress browser normally sends cookies, so its request does not reuse a shared anonymous object.
This broad rule is deliberately conservative. It also passes requests carrying cookies that do not personalize the response, which can reduce cache efficiency. Do not remove or weaken it merely to increase hit rates unless you have identified every cookie and verified that the resulting response is safe for anonymous visitors.
Responses are protected on the backend side as well. Built-in backend behavior treats a response containing Set-Cookie as uncacheable, preventing private session state from being stored as an ordinary shared object.
Baseline WordPress VCL rule
Install a WordPress-oriented rule in the active VCL configuration:
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vcl 4.1;
sub vcl_recv {
if (req.url ~ "wp-(login|admin)" || req.url ~ "preview=true") {
return (pass);
}
}The first expression matches WordPress login and administration URLs, including the usual /wp-login.php and /wp-admin/ paths. The second catches preview requests that include preview=true. Preview responses can reflect draft or user-specific content and should not be delivered from a shared cache.
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Choose the scope of the bypass
URL-only bypass
A URL rule is easy to inspect and troubleshoot. It explicitly protects login, administration, and preview URLs while leaving ordinary anonymous pages available to cache. It is a useful minimum when the built-in cookie and authorization rule remains enabled.
For a separate administration subtree, a boundary-aware expression avoids matching unrelated words:
sub vcl_recv {
if (req.url ~ "^/admin($|/.*)") {
return (pass);
}
}The /admin path is only illustrative. Standard WordPress uses /wp-admin and /wp-login.php; a site that changes its login URL needs a pattern for that actual path. Keep the pattern specific enough that a public URL containing a similar word is not accidentally passed.
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Logged-in-cookie bypass
A cookie-targeted policy can cover authenticated front-end pages that do not live under /wp-admin. Add a condition that recognizes the site’s logged-in WordPress cookie in req.http.Cookie, then return pass for that request.
The cookie name and formatting must be confirmed on the installation being changed. WordPress plugins, authentication extensions, and custom login systems can add or rename cookies. Match the logged-in cookie without stripping the general cookie safeguard. Unknown or future cookies should continue to trigger the built-in pass behavior unless you understand what every personalized response emits.
Combining both approaches
Most sites should retain the broad built-in cookie and authorization pass, then add explicit URL rules for login, administration, and previews. A cookie-specific condition is useful when you need to document or test authenticated front-end coverage, but it should supplement rather than replace the default safety behavior.
URL rules versus cookie rules
| Decision axis | URL-only rules | Logged-in-cookie rules |
|---|---|---|
| Custom login paths | Require a site-specific pattern for every custom path. | Cover authenticated requests regardless of which front-end URL is requested. |
| Authenticated front-end pages | Protect only the paths you enumerate, plus the built-in cookie pass. | Protect requests carrying the matched logged-in cookie across the site. |
| Anonymous cache hit rate | Leaves unrelated anonymous requests eligible for caching. | Still allows anonymous requests without the matched cookie to use cache, while broad cookie defaults may pass additional requests. |
| Operational complexity | Easier to reason about and debug. | Requires accurate cookie matching and testing after authentication changes. |
| CDN interaction | Must be coordinated with CDN URL bypass rules. | Must be coordinated with CDN cookie handling and cache-key policy. |
Why shared caching is dangerous for administrators
A cache object is shared by requests that map to the same cache key. If a personalized response is stored and later considered valid for another visitor, the second visitor could see the first user’s dashboard fragment, admin bar state, preview, or other private content. The risk is not limited to /wp-admin/; a logged-in front-end request can be personalized too.
Passing a request prevents a cache lookup for that request. A backend response with Set-Cookie is also excluded from ordinary shared storage. These controls work together: request-side bypass protects the fetch, and response-side handling prevents session-setting output from becoming a reusable object.
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Deploy the rule safely
- Map the request path. Identify the Varnish instance that actually receives traffic. Record whether a CDN, reverse proxy, host-level cache, or load balancer sits in front of it. A rule in an unused VCL file cannot protect the site.
- Locate the active configuration. Use the hosting provider’s documented control plane or deployment process to find the VCL that is loaded. Generated configurations may overwrite edits made to a source file, and some managed platforms accept snippets rather than a complete file.
- Preserve the default safeguards. Confirm that the active policy still passes requests with
req.http.Authorizationorreq.http.Cookie. Do not replace that logic with a narrow cookie list unless you have tested all personalized responses. - Add the explicit WordPress conditions. In
vcl_recv, passwp-login,wp-admin, andpreview=true. Add a custom login or administration path when the site does not use the standard WordPress URLs. - Reload through the host’s supported process. Varnish reload commands and file locations vary by operating system, hosting provider, and control panel. Follow the platform’s documented reload mechanism rather than applying a command intended for a different service layout.
- Check the configuration result. Confirm that the reload succeeded and that the active VCL, not merely a local draft, contains the rule. A syntax error or an overwritten generated file can leave the previous policy running.
Validate the bypass from outside the server
Test each traffic class after deployment. Use a clean browser session or an HTTP client that lets you control cookies, and inspect the response headers and the host’s Varnish logs. Header names differ by platform, so rely on the indicators documented by your provider.
- Anonymous public page: Request a normal public URL twice. It should remain eligible for the site’s normal caching policy rather than being globally forced to pass.
- Login endpoint: Request
wp-login.php. It should reach the origin instead of receiving a shared cached object. - Administration: Request
/wp-admin/and a representative dashboard URL. These should be passed. - Preview: Request a preview URL containing
preview=true. It should bypass shared cache. - Authenticated front end: Sign in, request a page that displays user-specific state, and verify that the request is passed because of the cookie or authorization policy.
- Second account: Log in as another user and request the same paths. The second account must not receive the first account’s dashboard, admin bar, preview, or private response.
- Logout: Log out, remove the session cookies, and request the same public URL. Verify that the anonymous response is appropriate and that no private content remains visible.
Depending on the Varnish version and configuration, logs may show a direct pass or a hit-for-pass object. Both indicate that the request is not being served from a normal shared cache object; interpret the exact label using your host’s logging documentation.
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The rule appears to do nothing
First verify traffic flow. A CDN or another reverse proxy may be answering the request before it reaches Varnish. Configure an equivalent bypass at that earlier layer, or change the request path so the Varnish rule is authoritative. Then confirm that the edited VCL is the active one and that a successful reload occurred.
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Check whether the browser actually sends the session cookie on that request. If it does, inspect the active built-in cookie condition; a custom VCL may have removed or rewritten it. If the site uses a custom authentication cookie, add a condition for that cookie after confirming its exact name and scope. Test with two accounts and with logout before accepting the change.
Anonymous pages stop caching
A broad cookie rule passes every request carrying any cookie, not only authenticated sessions. WordPress plugins may set cookies for preferences, experiments, carts, or other features. This behavior is safer but can reduce cache coverage. Do not narrow the rule until each remaining cookie has been shown not to personalize the response, and keep the response-side Set-Cookie protection.
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Preview content leaks or shows stale output
Ensure the bypass matches the query string used by the preview request. The baseline condition looks for preview=true in req.url. A plugin or custom editor may use a different preview parameter; inspect an actual request and add a site-specific condition only after confirming its behavior.
Changes disappear after a plugin or host update
Generated VCL can be replaced during a deployment, plugin update, or hosting configuration change. Store the rule in the platform’s supported customization layer, document it, and repeat the anonymous, login, preview, authenticated, logout, and second-account tests after updates.
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The URL-pattern guidance distinguishes return (pass) from pipe. Pass is the normal HTTP cache bypass: Varnish forwards the request to the backend without a cache lookup. Pipe switches the connection into a different handling mode and is intended for protocols or connection behavior that require it. It is not the ordinary way to bypass WordPress caching for administrators.
Operational checklist
- Use
vcl_recvfor request-side bypass conditions. - Return
passforwp-login,wp-admin, and preview requests. - Keep the built-in pass for
CookieandAuthorizationheaders. - Keep backend handling that prevents
Set-Cookieresponses from normal shared storage. - Match custom login paths explicitly.
- Coordinate Varnish rules with any CDN or host-level cache in front of it.
- Install the rule in the active VCL configuration and reload through the supported host process.
- Verify anonymous caching, login, administration, previews, authenticated front-end requests, logout, and a second account.
- Review logs for pass or hit-for-pass behavior and investigate any personalized response that appears as a normal cache hit.
When to customize beyond the baseline
The baseline is appropriate when the site uses standard WordPress paths and the built-in cookie policy is intact. Customize it when the installation has a custom login URL, a separate administration subtree, an authentication plugin with additional session cookies, or a CDN that applies its own cache rules.
Every customization trades simplicity for coverage or cache efficiency. URL rules are transparent but can miss a newly introduced personalized path. Cookie rules cover authenticated requests across the site but depend on exact cookie matching and careful testing. If you cannot explain why a cookie is safe to ignore, leave the request passed.
Final implementation pattern
For most WordPress deployments, keep the default cookie and authorization behavior, add the explicit URL bypass below, and extend it only for confirmed custom paths:
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vcl 4.1;
sub vcl_recv {
if (req.url ~ "wp-(login|admin)" || req.url ~ "preview=true") {
return (pass);
}
}This pattern protects the standard login and administration endpoints and excludes previews while allowing unrelated anonymous traffic to follow the existing cache policy. The safety of the finished setup depends on where the rule is installed, what proxy is in front of Varnish, and whether authentication or plugins add personalized requests outside the standard paths.
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