How to Find and Fix Soft 404 Errors

Use the 404 Checker in your IndexRender dashboard to identify pages that return incorrect HTTP status codes and resolve them before they impact your crawl efficiency, search visibility, and render usage.

TL;DR

The 404 Checker automatically verifies whether your domains return a proper 404 Not Found response for URLs that do not exist.

If a missing page incorrectly returns 200 OK, it becomes a soft 404. IndexRender treats these pages as valid content, caches them, and may continue recaching them during future refresh cycles, unnecessarily consuming renders and potentially confusing search engines and AI crawlers.

Fixing soft 404s ensures your cache contains only legitimate content while improving crawl quality and reducing avoidable render usage.

Why Soft 404s Matter

IndexRender caches pages that appear to be valid. When a non-existent URL returns a successful response instead of an actual 404 status, it can lead to:

Unnecessary cache growth.
Increased render consumption.
Repeated recaching of invalid pages.
Misleading signals to search engines.
Incorrect interpretation by AI crawlers and indexing systems.

Detecting and correcting these issues early helps maintain an efficient rendering pipeline and a healthier search presence.

Hard 404 vs Soft 404

Hard 404
The server correctly responds with an HTTP 404 Not Found status for a non-existent page. IndexRender does not cache these pages.
Soft 404
The page displays an error message to visitors but returns 200 OK. IndexRender interprets the page as valid content, caches it, and may continue refreshing it over time.

Best Practice: Proper 404 responses help search engines, AI crawlers, and IndexRender understand which URLs should not be indexed or cached.

Using the 404 Checker

Step 1: Open the 404 Checker

Sign in to your IndexRender dashboard and select 404 Checker from the navigation menu.

The dashboard provides a centralized view of all monitored domains and their current 404 health status.

Step 2: Add a Domain

Click Add Domain, enter the domain you want to monitor, and save your changes.

Example:

https://example.com

Once added, IndexRender automatically initiates verification checks.

Step 3: Review Verification Results

The checker validates two critical conditions:

Domain Reachable — Confirms that IndexRender can successfully access your website.
Proper 404 Returned — Confirms that non-existent URLs return an HTTP 404 response.

While verification is in progress, a pending indicator is displayed. Completed checks are represented using status icons:

✔ Successful validation
⚠ Soft 404 detected
✖ Verification failed

Hover over warning indicators to view additional diagnostic information, including detected status codes and validation details.

Soft 404 Detected: This means the page appears to be missing but still returns a successful HTTP response. These pages may continue consuming renders and can be interpreted as valid content by crawlers.

Configure Monitoring Frequency

Choose how frequently IndexRender should verify each domain.

Every 1 hour
Every 4 hours
Every 8 hours
Every 24 hours (Recommended)
Every week

Usage Consideration: Each verification request consumes one render from your monthly quota. More frequent checks provide faster detection but increase render usage. Daily monitoring is sufficient for most websites.

Fixing Soft 404 Errors

When a page is identified as a soft 404, configure IndexRender to treat it as a true 404 response by adding the following meta tag within the page's <head> section:

<meta name="indexrender-status-code" content="404">

This instructs IndexRender to classify the rendered page as a 404 Not Found, preventing it from being cached during future rendering cycles.

Important: This change affects only how IndexRender interprets the rendered output. It does not alter the experience seen by your website visitors.

Verify the Resolution

After implementing the fix, allow the next scheduled verification cycle to complete.

A soft 404 is considered resolved when:

The warning indicator disappears.
The domain is marked as reachable.
The proper 404 validation passes successfully.

If warnings persist, verify that the meta tag has been placed correctly inside the document head and wait for the next refresh cycle before rechecking the domain.

Best Practices

Monitor newly launched sections of your website closely.
Resolve soft 404s promptly to avoid unnecessary render consumption.
Ensure status code directives are rendered early enough for IndexRender to detect them.
Review warning details to identify recurring configuration issues.
Use daily monitoring as a baseline and increase frequency during major deployments.

A healthy 404 strategy improves more than SEO. It keeps your IndexRender cache lean, reduces wasted renders, provides cleaner signals to AI crawlers, and ensures only meaningful content is eligible for indexing.

Need assistance? If you continue experiencing issues after applying these recommendations, contact the IndexRender support team and we'll help you diagnose the problem.