Why Am I Getting 404 Errors When Serving CSS in My Go Web Application?

Troubleshooting 404 Errors in Go Web Applications Rendering CSS Files

Introduction

When developing Go web applications that utilize CSS stylesheets, encountering "404 page not found" errors can be frustrating. This article will guide you through resolving this issue by delving into the underlying causes and providing solutions.

The Issue: Static File Resolution

In Go web applications, static files such as CSS and HTML are typically served using the http.FileServer handler. This handler requires a specific path to the files you want to expose. When an HTTP request is made for a static file, the handler searches for it in the specified directory. If the file cannot be found, it results in a 404 error.

Solution: Correct File Path and Working Directory

To resolve the 404 error, ensure that the file path specified in the http.FileServer handler is correct and that your application is being run from the appropriate working directory. The working directory is the folder where the main function of your application resides.

For example, if your CSS files are located in the css folder within the src directory, and your main function is in src/server/server.go, then the correct file path to use in http.FileServer is:

http.Handle("/css/", http.StripPrefix("/css/", http.FileServer(http.Dir("src/css"))))

Additionally, running your application from the src directory ensures that the working directory is correct. If you run your application from another directory, the handler may not be able to locate the CSS files.

Conclusion

By verifying the file path and running your application from the appropriate working directory, you can resolve "404 page not found" errors when rendering CSS files in Go web applications. Remember, the correct file path and working directory are crucial for ensuring that static files are served correctly.

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