我們正在嘗試通過 POST 請求實現圖像上傳。我們還希望將圖像限制在 ~1,0 MiB。它適用于較小的圖像，但任何 ~2,5 MiB 或更大的東西都會導致連接重置。它似乎也在第一個請求之后向同一個處理程序發送多個請求。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>上傳 ~2,4 MiB 文件時的輸出$ go run main.go2021/11/23 22:00:14 File too large它還在瀏覽器中顯示“請求太大”上傳 ~2,5 MiB 文件時的輸出$ go run main.go2021/11/23 22:03:25 File too large2021/11/23 22:03:25 File too large瀏覽器現在顯示連接已重置
1 回答
慕娘9325324
TA貢獻1783條經驗 獲得超4個贊
客戶端正在嘗試向服務器發送數據。服務器沒有讀取數據，它只是查看標題并關閉連接?？蛻舳藢⒋私忉尀椤斑B接已重置”。這是你無法控制的。
不是檢查標題，而是標題可以撒謊，用于http.MaxBytesReader讀取實際內容，但如果它太大，則會出錯。
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")
}
有關更多詳細信息，請參閱如何在 Go 中處理文件上傳。
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