我们正在尝试通过 POST 请求实现图像上传。我们还希望将图像限制在 ~1,0 MiB。它适用于较小的图像，但任何 ~2,5 MiB 或更大的东西都会导致连接重置。它似乎也在第一个请求之后向同一个处理程序发送多个请求。main.go：package mainimport ( "log" "net/http")func main() { http.HandleFunc("/", uploadHandler) http.ListenAndServe("localhost:8080", nil)}func uploadHandler(w http.ResponseWriter, r *http.Request) { if r.Method == "POST" { postHandler(w, r) return } else { http.ServeFile(w, r, "index.html") }}func postHandler(w http.ResponseWriter, r *http.Request) { // Send an error if the request is larger than 1 MiB if r.ContentLength > 1<<20 { // if larger than ~2,5 MiB, this will print 2 or more times log.Println("File too large") // And this error will never arrive, instead a Connection reset http.Error(w, "response too large", http.StatusRequestEntityTooLarge) return } return}索引.html：<!DOCTYPE html><html lang=""> <head> <meta charset="utf-8"> <title></title> </head> <body> <form method="POST" enctype="multipart/form-data"> <input type="file" accept="image/*" name="profile-picture"><br> <button type="submit" >Upload</button> </form> </body></html>上传 ~2,4 MiB 文件时的输出$ go run main.go2021/11/23 22:00:14 File too large它还在浏览器中显示“请求太大”上传 ~2,5 MiB 文件时的输出$ go run main.go2021/11/23 22:03:25 File too large2021/11/23 22:03:25 File too large浏览器现在显示连接已重置
1 回答
慕娘9325324
TA贡献1783条经验 获得超4个赞
客户端正在尝试向服务器发送数据。服务器没有读取数据，它只是查看标题并关闭连接。客户端将此解释为“连接已重置”。这是你无法控制的。
不是检查标题，而是标题可以撒谎，用于http.MaxBytesReader读取实际内容，但如果它太大，则会出错。
const MAX_UPLOAD_SIZE = 1<<20
func postHandler(w http.ResponseWriter, r *http.Request) {
// Wrap the body in a reader that will error at MAX_UPLOAD_SIZE
r.Body = http.MaxBytesReader(w, r.Body, MAX_UPLOAD_SIZE)
// Read the body as normal. Check for an error.
if err := r.ParseMultipartForm(MAX_UPLOAD_SIZE); err != nil {
// We're assuming it errored because the body is too large.
// There are other reasons it could error, you'll have to
// look at err to figure that out.
log.Println("File too large")
http.Error(w, "Your file is too powerful", http.StatusRequestEntityTooLarge)
return
}
fmt.Fprintf(w, "Upload successful")
}
有关更多详细信息，请参阅如何在 Go 中处理文件上传。
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