I’m trying to set up the Gmail API using Go, but I keep getting an error when I attempt to retrieve the token from the web. The browser warns that the site can’t be reached and localhost is refusing the connection.
I’ve tried pasting the long OAuth URL and also using http://localhost:8000, but both methods return the ERR_CONNECTION_REFUSED error.
It’s odd because the Python quickstart works without any issue, and I even managed to use a token obtained from Python with the Go version successfully. Clearly, the problem is isolated to the token retrieval in the Go implementation.
Has anyone faced this problem and might have a solution? I wonder if I’m missing a step or if there’s an issue with my configuration.
Here is a revised version of the code I’m using:
func fetchWebToken(config *oauth2.Config) *oauth2.Token {
url := config.AuthCodeURL("state-token", oauth2.AccessTypeOffline)
fmt.Printf("Please visit this URL: %v\n", url)
var code string
fmt.Print("Enter the code provided: ")
fmt.Scan(&code)
token, err := config.Exchange(context.TODO(), code)
if err != nil {
log.Fatalf("Failed to retrieve token: %v", err)
}
return token
}
Any suggestions would be very helpful!
I encountered a similar issue when setting up the Gmail API with Go. The problem often stems from the redirect URI configuration in your Google Cloud Console project. Make sure you’ve added ‘http://localhost:8000’ (or whichever port you’re using) to the list of authorized redirect URIs for your OAuth 2.0 client ID.
Another potential cause could be firewall or antivirus software blocking the localhost connection. Try temporarily disabling these to see if it resolves the issue. If that works, you’ll need to add an exception for your application.
Lastly, check if the port you’re using isn’t already occupied by another process. You can try changing the port number in your code and updating the redirect URI accordingly in the Google Cloud Console.
If none of these solve the problem, you might want to consider using a tool like ngrok to create a secure tunnel to your localhost for testing purposes.
I’ve run into this exact problem before, and it can be incredibly frustrating. One thing that worked for me was explicitly specifying the loopback IP address instead of using ‘localhost’. Try changing your redirect URI to ‘http://127.0.0.1:8000’ both in your code and in the Google Cloud Console settings.
Another potential issue could be with your Go environment. Make sure you’re running the latest version of Go and that all your dependencies are up to date. Sometimes, older versions can have quirks with certain APIs.
If you’re still having trouble, you might want to check your system’s hosts file. Occasionally, there can be conflicts there that prevent localhost from resolving correctly. It’s a long shot, but worth checking if nothing else works.
Lastly, have you tried running your Go application with elevated privileges? Sometimes, binding to localhost requires admin rights, especially on certain operating systems. Just be cautious when doing this, of course.
hey, i had this problem too. what fixed it for me was using a different port. try changing it to something like 3000 or 5000 in ur code and the google cloud console. also, make sure ur not running any other apps that might be using that port. goodluck!