urllib.error.HTTPError: HTTP Error 404: Not Found

Step 1: Import the necessary modules To begin, import the required modules for making HTTP requests and handling errors. In this case, we need to import the "urllib" module, specifically the "error" submodule.

Step 2: Set the URL Next, define the URL that you want to access. This is the website address you want to retrieve information from. Make sure the URL is correct and points to a valid webpage.

Step 3: Make the HTTP request Using the "urllib.request.urlopen()" function, make an HTTP request to the specified URL. This function sends a GET request to the server and retrieves the response.

Step 4: Check for errors After making the request, check if any errors occur during the process. In this case, we encounter the "urllib.error.HTTPError" exception, which is raised when the server returns a non-200 status code. A 404 status code indicates that the requested resource was not found.

Step 5: Handle the error When a 404 error occurs, you can handle it by catching the "urllib.error.HTTPError" exception. This allows you to perform specific actions or display appropriate error messages to the user. In this case, you can print a message indicating that the requested resource was not found.

Step 6: Handle other exceptions Apart from 404 errors, there may be other exceptions that can occur during the HTTP request process. It is essential to handle these exceptions properly to ensure the program does not crash unexpectedly. You can catch other exceptions, such as "urllib.error.URLError," to handle network-related errors or other issues that may arise.

By following these steps, you can make an HTTP request using the "urllib" module in the C programming language and handle HTTP errors, such as the "HTTP Error 404: Not Found" exception.