Parse multipart form requests in Go using ParseMultipartForm and FormFile to handle file uploads.
Use http.Request.ParseMultipartForm to parse the request body and access uploaded files via r.FormFile.
r.ParseMultipartForm(32 << 20) // 32 MB max
file, header, err := r.FormFile("file")
if err != nil {
http.Error(w, err.Error(), http.StatusBadRequest)
return
}
// Save file: io.Copy(os.Create("path"), file)
File uploads in Go handle files sent from a web form to your server. This process extracts the file data from the incoming request so you can save it to your disk or process it. Think of it as opening a mailbox, taking out the envelope, and reading the letter inside.