golang http Web 文件上传操作

package main
 
import (
    "bytes"
    "fmt"
    "io"
    "io/ioutil"
    "mime/multipart"
    "net/http"
    "os"
)
 
func main() {
    req, _ := newfileUploadRequest("http://192.168.2.144:8956/v1/body-eval/data-info", nil, "file_name", "1.txt")
    client := &http.Client{}
    fmt.Println(req)
    resp, err := client.Do(req)
 
    defer resp.Body.Close()
 
    body, err := ioutil.ReadAll(resp.Body)
    if err != nil {
        // handle erro
    }
 
    fmt.Println(string(body))
}
 
func newfileUploadRequest(uri string, params map[string]string, paramName, path string) (*http.Request, error) {
    file, err := os.Open(path)
    if err != nil {
        return nil, er
    }
    defer file.Close()
 
    body := &bytes.Buffer{}
    writer := multipart.NewWriter(body)
    part, err := writer.CreateFormFile(paramName, path)
    if err != nil {
        return nil, er
    }
    _, err = io.Copy(part, file)
 
    for key, val := range params {
        _ = writer.WriteField(key, val)
    }
    err = writer.Close()
    if err != nil {
        return nil, er
    }
    request, err := http.NewRequest("POST", uri, body)
    request.Header.Set("Content-Type", writer.FormDataContentType())
    return request, er
}