Why Does My Go HTTP Client Get a 403 Error When Downloading GitHub Files?

Go HTTP Client: 403 Access Restriction for GitHub File Downloads

Encountering a "Your access to this site has been restricted" error when using Go's HTTP client to retrieve zip or tar.gz files from GitHub can be frustrating. While curl may function properly, it's worth investigating the underlying issue.

Environmental Context:

• Go 1.15.linux-amd64
• AWS EC2 Instance (us-west-2 region)
• Ubuntu Server 16.04 LTS

Code Sample:

<code class="go">package main

import (
    "fmt"
    "io/ioutil"
    "net/http"
)

func main() {
    endpoint := "https://github.com/kubeflow/manifests/archive/v1.0.2.tar.gz"

    resp, err := http.Get(endpoint)
    if err != nil {
        fmt.Printf("[error] %v\n", err)
        return
    }
    defer resp.Body.Close()

    respData, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        fmt.Printf("[error] %v\n", err)
        return
    }

    fmt.Printf("Resp:\n%v\n", string(respData))
}</code>

Troubleshooting:

A potential cause of the 403 error is related to GitHub's access control. It's recommended to follow these steps to resolve the issue:

Updating IDE and Git:

• In IntelliJ IDEA, navigate to File > Settings > Plugins.
• Search for Git and select Update.
• Restart IntelliJ IDEA.

After updating the IDE and Git, try rerunning the code. This approach has proven effective in solving the "access restricted" issue for many users.

Additional Considerations:

• Check if there are any firewall rules or IP address restrictions on either GitHub's or AWS's side.
• Ensure that your API token or credentials are configured correctly for authentication.
• Review the HTTP request headers sent by your Go client and compare them to successful curl operations. Any discrepancies could point to configuration issues.

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