i have a question,

How can i send a file over an http POST request directly to the receiver?

I mean, without saving it first to the memory, because say the file is large (>1Gb), this will give a memory error. I have used this pattern:

file, _ := os.Open(fileName);

req, err := http.NewRequest("POST", "http://"+serverAddress + fileName, file);

if err != nil {
    fmt.Println("Error creating the request: " + err.Error());
}
    
client := &http.Client{}
_, err = client.Do(req)
if err != nil {
    fmt.Println("Error sending the request: " + err.Error());
}

but this gives this error:

Error unmarshaling body: invalid character […]

Also passing an io.Reader gives the same error.

I want to send the file directly to the receiver without processing it.

Thank You