英文:
golang server upload file response net::ERR_EMPTY_RESPONSE
问题
我正在使用DART + golang将一个小的音频文件上传到服务器。一切都运行得很好，直到我进行POST请求后，golang没有返回任何内容。我想返回文件名，这样我就可以更改输入框的标签文本。
1）GOLANG代码：
import (
"encoding/json"
"io/ioutil"
"log"
"net/http"
"time"
"fmt"
"os"
"io"
)
http.HandleFunc("/upload", webUploadHandler)
[...]
func webUploadHandler(w http.ResponseWriter, r *http.Request) {
file, header, err := r.FormFile("file") // the FormFile function takes in the POST input id file
defer file.Close()
if err != nil {
fmt.Fprintln(w, err)
return
}
out, err := os.Create("/tmp/uploadedfile")
if err != nil {
fmt.Fprintf(w, "Unable to create the file for writing. Check your write access privilege")
return
}
defer out.Close()
// write the content from POST to the file
_, err = io.Copy(out, file)
if err != nil {
fmt.Fprintln(w, err)
}
fmt.Fprintf(w,"File uploaded successfully : ")
fmt.Fprintf(w, header.Filename)
}
2）DART响应，警告：
window.alert("upload complete");
可以正常工作。
3）Chromium控制台中的错误：
POST http://localhost:9999/upload net::ERR_EMPTY_RESPONSE
我对GOLANG还不太熟悉，所以非常感谢任何帮助。
英文:
I am uploading a small audio file to server using DART + golang. Everything kinda works fine, until I POST and go doesn't return anything. I would like to return filename so I can change the label text on the input.
-
GOLANG:
import (
"encoding/json"
"io/ioutil"
"log"
"net/http"
"time""fmt" "os" "io")
http.HandleFunc("/upload", webUploadHandler)
[...]
func webUploadHandler(w http.ResponseWriter, r *http.Request) {
file, header, err := r.FormFile("file") // the FormFile function takes in the POST input id file defer file.Close() if err != nil { fmt.Fprintln(w, err) return } out, err := os.Create("/tmp/uploadedfile") if err != nil { fmt.Fprintf(w, "Unable to create the file for writing. Check your write access privilege") return } defer out.Close() // write the content from POST to the file _, err = io.Copy(out, file) if err != nil { fmt.Fprintln(w, err) } fmt.Fprintf(w,"File uploaded successfully : ") fmt.Fprintf(w, header.Filename)}
-
DART response, alert
window.alert("upload complete");
works
-
ERROR in Chromium Console:
POST http://localhost:9999/upload net::ERR_EMPTY_RESPONSE
I'm quite new to GOLANG so any help will me much appreciated.
答案1
得分: 1
上面代码中的第一个错误是：
defer file.Close()
在检查
if err != nil
之前出现了。
-- 更新
在DART中缺少第二部分：
req.setRequestHeader("Content-type","multipart/form-data");
英文:
First error in the code above:
defer file.Close()
was before checking
if err != nil
-- UPDATE
and missing part 2, in DART:
req.setRequestHeader("Content-type","multipart/form-data");
通过集体智慧和协作来改善编程学习和解决问题的方式。致力于成为全球开发者共同参与的知识库，让每个人都能够通过互相帮助和分享经验来进步。
评论