Go Web App 404 Error: Why Can't My Server Find My CSS Files?

404 Page Not Found: Why Your Go Web App Can't Find Your CSS File

When attempting to render CSS files in a Go web application, you may encounter the dreaded 404 page not found error. This error indicates that the web server is unable to locate the requested CSS file. Let's explore the issue and provide a solution.

In your case, you have specified a relative path ("/css/") for the CSS folder, which is a common practice in Go's HTTP handler. However, the success of this approach hinges on the working directory from which you execute your Go application.

If you execute your application from the src directory where your CSS folder resides, you'll most likely face no issues. However, if you execute your application from the src/server directory or from a compiled binary in the bin folder, the CSS folder will not be accessible relative to the current working directory, leading to the 404 error.

Solution:

To resolve this issue, you have two options:

1. Modify the Working Directory: Start your Go application from the src directory where your CSS folder exists. This can be achieved by running go run server/server.go from the src directory.
2. Copy Static Files to Executable Location: If you prefer not to modify the working directory, you can copy the CSS folder (as well as other static files such as HTML templates) to the directory where you execute your compiled binary. This ensures that the CSS files are accessible relative to the executable's location, even if it's not in the same directory as the source files.

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