Observing 401 http status code using the FTP credentials from a go lang code while accessing the Azure App Service long using SCM kudu service

Question

Problem Statement: I have an Azure app service, and its log is generated under the https://<prod_server>.scm.azurewebsites.net/wwwroot/logs/. I am able to access it from the browser as my default credential is already logged in with. I am trying to achieve the same using Golang code running from my code editor (i.e. Visual Studio Code).

I am using the credentials: (please refer the screenshot below)

I am able to access it from the browser:

Sample GoLong Code:

package main
import (
	"encoding/base64"
	"fmt"
	"log"
	"net/http"
)
func main() {
	// Replace with your correct SCM Access Key
	accessKey := "<ftp_password>" // Use the publishing password from the output
	// Replace with your Azure App Service SCM URL
	url := fmt.Sprintf("https://<prod_server>.scm.azurewebsites.net/api/vfs/site/wwwroot/logs/")
	// Prepare Basic authentication header
	// Ensure to escape the backslash correctly
	username := "<user_username>" // Escaped backslash in username
	auth := base64.StdEncoding.EncodeToString([]byte(username + ":" + accessKey))
	// Create HTTP GET request
	req, err := http.NewRequest("GET", url, nil)
	if err != nil {
		log.Fatalf("Error creating request: %v", err)
	}
	req.Header.Set("Authorization", "Basic "+auth)
	// Execute the request
	client := &http.Client{}
	resp, err := client.Do(req)
	if err != nil {
		log.Fatalf("Request failed: %v", err)
	}
	defer resp.Body.Close()
	// Handle response
	if resp.StatusCode != http.StatusOK {
		log.Fatalf("Error: %s", resp.Status)
	}
	// Print log files or handle as needed
	fmt.Println("Logs retrieved successfully")
}

Note: My user name is like username\$username (would that be a problem? just thought to mention).

Why am I observing the below error?

Now if I try the same user name and password in FTP tools like WinScp, it works like a charm. But the above code is giving me the following error:

2025/01/16 12:03:25 Error: 401 Unauthorized
exit status 1

Answer 1

Hi @Jyoti Mallick
I'm glad that you were able to resolve your issue and thank you for posting your solution so that others experiencing the same thing can easily reference this! Since the Microsoft Q&A community has a policy that "The question author cannot accept their own answer. They can only accept answers by others ", I'll repost your solution in case you'd like to accept the answer.
The user name was the culprit here; you don't need to send the username\\$username rather it should be only $username`

package main
import (
	"encoding/base64"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
)
func main() {
	// Replace with your correct SCM Access Key
	accessKey := "<Password>" // Use the publishing password from the output
	// Replace with your Azure App Service SCM URL
	url := fmt.Sprintf("https://<URL>.scm.azurewebsites.net/api/vfs/site/wwwroot/logs")
	// Prepare Basic authentication header
	// Ensure to escape the backslash correctly
	username := "$<username>" // Escaped backslash in username
	auth := base64.StdEncoding.EncodeToString([]byte(username + ":" + accessKey))
	// Create HTTP GET request
	req, err := http.NewRequest("GET", url, nil)
	if err != nil {
		log.Fatalf("Error creating request: %v", err)
	}
	req.Header.Set("Authorization", "Basic "+auth)
	// Execute the request
	client := &http.Client{}
	resp, err := client.Do(req)
	if err != nil {
		log.Fatalf("Request failed: %v", err)
	}
	defer resp.Body.Close()
	// Handle response
	if resp.StatusCode != http.StatusOK {
		log.Fatalf("Error: %s", resp.Status)
	}
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		log.Fatalf("Error reading response body: %v", err)
	}
	// Print log files or handle as needed
	fmt.Println("Logs retrieved successfully")
	fmt.Println(string(body))
}

If this answers your query, do click Accept Answer and Yes for was this answer helpful. And, if you have any further query do let us know.

Answer 2

The user name was the culprit here; you dont need to send the username\\$username rather it should be only $username`

Please follow the code,

package main
import (
	"encoding/base64"
	"fmt"
	"io/ioutil"
	"log"
	"net/http"
)
func main() {
	// Replace with your correct SCM Access Key
	accessKey := "<Password>" // Use the publishing password from the output
	// Replace with your Azure App Service SCM URL
	url := fmt.Sprintf("https://<URL>.scm.azurewebsites.net/api/vfs/site/wwwroot/logs")
	// Prepare Basic authentication header
	// Ensure to escape the backslash correctly
	username := "$<username>" // Escaped backslash in username
	auth := base64.StdEncoding.EncodeToString([]byte(username + ":" + accessKey))
	// Create HTTP GET request
	req, err := http.NewRequest("GET", url, nil)
	if err != nil {
		log.Fatalf("Error creating request: %v", err)
	}
	req.Header.Set("Authorization", "Basic "+auth)
	// Execute the request
	client := &http.Client{}
	resp, err := client.Do(req)
	if err != nil {
		log.Fatalf("Request failed: %v", err)
	}
	defer resp.Body.Close()
	// Handle response
	if resp.StatusCode != http.StatusOK {
		log.Fatalf("Error: %s", resp.Status)
	}
	body, err := ioutil.ReadAll(resp.Body)
	if err != nil {
		log.Fatalf("Error reading response body: %v", err)
	}
	// Print log files or handle as needed
	fmt.Println("Logs retrieved successfully")
	fmt.Println(string(body))
}