How do I handle multipart forms and large uploads?

In Go, handling multipart forms and large file uploads is straightforward with the standard library. The `http` package provides built-in functionality to process file uploads with ease. When dealing with large uploads, it's important to carefully manage memory and handle potential errors gracefully.

Here’s an example that demonstrates how to handle multipart file uploads in Go:


        package main

        import (
            "net/http"
            "fmt"
            "log"
        )

        func uploadFile(w http.ResponseWriter, r *http.Request) {
            if r.Method == http.MethodPost {
                // Parse the multipart form
                err := r.ParseMultipartForm(10 << 20) // Limit your file size to 10 MB
                if err != nil {
                    http.Error(w, "Unable to parse form", http.StatusBadRequest)
                    return
                }

                // Retrieve the file from the form
                file, _, err := r.FormFile("file")
                if err != nil {
                    http.Error(w, "Unable to retrieve file", http.StatusBadRequest)
                    return
                }
                defer file.Close()

                // Process the file (e.g., save it to disk or handle it)
                // For demonstration, we're just going to log the file size
                fmt.Fprintf(w, "Uploaded file successfully! Size: %v bytes", r.ContentLength)
            } else {
                http.ServeFile(w, r, "upload.html") // Serve an upload form
            }
        }

        func main() {
            http.HandleFunc("/upload", uploadFile)
            log.Println("Server starting at :8080...")
            log.Fatal(http.ListenAndServe(":8080", nil))
        }

How do I handle multipart forms and large uploads?

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How do I handle multipart forms and large uploads?

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