I'm trying to download a file fro the url to a local file.

I wanted to test whether the requesting url is only file, if it is not a file it should return bad request

Any help could be appreciated

package main
    
    import (
        "fmt"
        "io"
        "net/http"
        "os"
    )
    
    func main() {
        fileUrl := "http://example.com/file.txt"
        err := DownloadFile("./example.txt", fileUrl)
        if err != nil {
            panic(err)
        }
        fmt.Println("Downloaded: "   fileUrl)
    }
    
    // DownloadFile will download a url to a local file.
    func DownloadFile(filepath string, url string) error {
    
        // Get the data
        resp, err := http.Get(url)
        if err != nil {
            return err
        }
        defer resp.Body.Close()
    
        // Create the file
        out, err := os.Create(filepath)
        if err != nil {
            return err
        }
        defer out.Close()
    
        // Write the body to file
        _, err = io.Copy(out, resp.Body)
        return err
    }

CodePudding user response：

Below is the way to check whether the URL is downloadable or not. Hope this helps someone :)

  package main
        
        import (
            "fmt"
            "io"
            "net/http"
            "os"
        )
        
        func main() {
            fileUrl := "http://example.com/file.txt"
            err := DownloadFile("./example.txt", fileUrl)
            if err != nil {
                panic(err)
            }
            fmt.Println("Downloaded: "   fileUrl)
        }
        
        // DownloadFile will download a url to a local file.
        func DownloadFile(filepath string, url string) error {
        
            // Get the data
            resp, err := http.Get(url)
            contentType = resp.Header.Get("Content-Type")  
    
            if err != nil {
                return err
            }
            defer resp.Body.Close()
    
    if contentType == "application/octet-stream" {
            // Create the file
            out, err := os.Create(filepath)
            if err != nil {
                return err
            }
            defer out.Close()
        
            // Write the body to file
            _, err = io.Copy(out, resp.Body)
            return err
        }
        }else{
        fmt.Println("Requested URL is not downloadable")
        }