我正在尝试上传文件而不将其加载到内存中,如下所示。像 S3 这样的服务需要Content-Length
在这种情况下设置。是否有内置的 go-lang 可以做到这一点,或者我必须自己计算它。
package main
import (
"io"
"mime/multipart"
"net/http"
"os"
"path/filepath"
)
func newfileUploadRequest(uri string, params map[string]string, paramName, path string) (*http.Request, chan error, error) {
file, err := os.Open(path)
if err != nil {
return nil, nil, err
}
bodyReader, bodyWriter := io.Pipe()
multiWriter := multipart.NewWriter(bodyWriter)
errChan := make(chan error, 1)
go func() {
defer bodyWriter.Close()
defer file.Close()
part, err := multiWriter.CreateFormFile(paramName, filepath.Base(path))
if err != nil {
errChan <- err
return
}
if _, err := io.Copy(part, file); err != nil {
errChan <- err
return
}
for k, v := range params {
if err := multiWriter.WriteField(k, v); err != nil {
errChan <- err
return
}
}
errChan <- multiWriter.Close()
}()
req, err := http.NewRequest("POST", uri, bodyReader)
return req, errChan, err
}
任何帮助将非常感激。