```html

Online Tutorial -- Learn more than just technology, it's a dream!

• Home
• HTML
• JavaScript
• CSS
• Vue
• React
• Python3
• Java
• C
• C++
• C#
• AI
• Go
• SQL
• Linux
• VS Code
• Bootstrap
• Git
• Local Bookmarks

• Home
• HTML
• CSS
• JS
• Local Bookmarks
• Search

• Vue3 Tutorial
• Vue2 Tutorial

• Bootstrap3
• Bootstrap4
• Bootstrap5

• Machine Learning
• PyTorch
• TensorFlow
• Sklearn
• NLP
• AI Agent
• Ollama
• Coding Plan

About Online Tutorial
About Us Disclaimer Mobile App Download Online Tutorial Sitemap Programmer Learning Path Notes Issues with CHM files...

404 NOT FOUND!

Sorry, we couldn't find the article you're looking for!!

The 404 page is an essential part of any website, carrying significant responsibility for user experience and SEO optimization. A 404 error occurs when users visit pages that do not exist or have been deleted on the site. If webmasters don't set up a custom 404 page, dead links will appear, which can negatively impact search engine indexing during crawls.

Origin of 404 Not Found

Legend has it that before the Third Industrial Revolution, the form of the Internet was a large central database located in Room 404. At that time, all requests were manually processed by humans. If the requested file wasn't found in the database, or if there was a mistake in the request number, users would receive a message: room 404 : file not found. After the rise of the Internet, people became accustomed to using 404 as the server response code indicating that a file could not be found. Of course, historical verification shows that the legendary Room 404 never actually existed.

Two Major Benefits of Setting Up a 404 Page

• Guide users not to close the site, enhancing user experience.
• Prevent the appearance of dead links on the website.

See more about HTTP Status Codes.

• Category Navigation
• • Python / Data Science
    • Python Tutorial
    • Python2.x Tutorial
    • FastAPI Tutorial
    • Flask Tutorial
    • Django Tutorial
    • NumPy Tutorial
    • Pandas Tutorial
    • SciPy Tutorial
    • Matplotlib Tutorial
    • Dash Tutorial
    • Jupyter Notebook Tutorial
    • Pillow Tutorial
    • Quantitative Trading
    • R Tutorial
    • Julia Tutorial
  • AI / Intelligent Development
    • AI Agent (Intelligent Agent)
    • AI (Artificial Intelligence)
    • Codex Tutorial
    • Claude Code
    • OpenCode
    • Skills
    • Ollama Tutorial
    • TensorFlow Tutorial
    • PyTorch Tutorial
    • Scikit-learn Tutorial
    • Machine Tutorial
    • LangChain
    • Natural Language Processing NLP
    • OpenCV Tutorial
    • Selenium Tutorial
    • Playwright Tutorial
  • Frontend Development
    • HTML Tutorial
    • HTML5 Tutorial
    • CSS Tutorial
    • CSS3 Tutorial
    • JavaScript Tutorial
    • HTML DOM Tutorial
    • TypeScript Tutorial
    • AJAX Tutorial
    • JSON Tutorial
    • Tailwind CSS Tutorial
    • Bootstrap4 Tutorial
    • Bootstrap5 Tutorial
    • Foundation Tutorial
    • Vue.js Tutorial
    • Vue3 Tutorial
    • React Tutorial
    • Next.js Tutorial
    • AngularJS Tutorial
    • Angular Tutorial
    • jQuery Tutorial
    • jQuery UI Tutorial
    • jQuery EasyUI Tutorial

```