How to Fix GitBook Page Not Found

In this tutorial, you'll learn about How to Fix GitBook Page Not Found. We cover key concepts, practical examples, and best practices.

A GitBook page returns 404 — the page was moved, deleted, or the URL path changed. GitBook does not auto-redirect moved pages.

The Wrong Way

curl https://docs.example.com/page/old-slug
# Returns 404
# Trying to access the same URL with different casing

GitBook URLs are case-sensitive. My-Page and my-page are different URLs.

The Right Way

Step 1: Check the page in the GitBook editor

# Open GitBook space → click "Pages" in the sidebar
# Search for the page by title
# If found, note the current URL slug

Step 2: Update the URL slug

# In the page editor:
# Page settings → "URL Slug"
# Set to a stable value: "api-reference-v2"
# This changes the URL permanently

Step 3: Check page visibility

# Pages can be:
# - "Published" → visible to all readers
# - "Draft" → invisible to readers (shows 404)
# - "Hidden from index" → accessible by URL but not listed

If a page is in "Draft" status, it returns 404 for non-editors.

Step 4: Recover a deleted page

# GitBook Space → "..." → "Trash"
# Deleted pages stay in trash for 30 days
# Select the page → "Restore"

If the page is not in trash, check version history of the space.

Page "API Reference" restored from trash — URL `/api/reference-v2` returns 200, linked from index.

Prevention

• Set stable URL slugs when creating pages, not after content is written.
• Avoid changing page titles that auto-generate slugs — manual slugs are permanent.
• The URL stability approach mirrors Doda Browser's bookmark management — stable URLs avoid broken bookmarks.

Common Mistakes with page not found

1. Using foldl instead of foldl' causing stack overflow on large lists
2. Forgetting deriving (Show, Eq) on custom data types needed for debugging
3. Placing the wildcard pattern first in case expressions, making all subsequent patterns unreachable

These mistakes appear frequently in real-world GITBOOK code. DodaTech's contributors have identified these patterns through analysis of open-source projects and production systems.

Practice Exercise

Write a pure function that safely divides two integers using Maybe, then test it with edge cases like division by zero and negative numbers.

This exercise reinforces the concepts covered in this guide. Try implementing it before checking online solutions.

FAQ