AlexxIT/go2rtc · warning

empty username or password

Error message

empty username or password

What it means

The handler requires both username and password form fields, but at least one was empty or missing from the multipart form. It rejects the request with HTTP 400 and this static message before any network calls are made.

Solutions

1. Include both username and password fields with non-empty values in the multipart form
2. Fix field naming on the client to match the handler
3. Add client-side required-field validation before submitting

Example fix

// before
curl -X POST http://host/api -F 'username=u'
// after
curl -X POST http://host/api -F 'username=u' -F 'password=p'

if r.Form.Get("username") == "" || r.Form.Get("password") == "" {
	// return 400 with 'empty username or password' before any network call
}

When it happens

Trigger: POST to the roborock endpoint where r.Form.Get("username") or r.Form.Get("password") returns "" - fields absent, misspelled, or sent with empty values.

Common situations: Form field name mismatch (user vs username); frontend submitted with blank inputs; client only sent one of the two fields.

Understand the failure class

Background: "must not be empty", "cannot be empty" — required-field validation errors across open-source libraries — this error's family across 41 libraries.

Related errors

• either email/password or refresh token is required
• milesone: authentication failed:
• failed to decode hex
• data too short: bytes
• Code must be in the range [0, 125]

AI-assisted analysis of AlexxIT/go2rtc@c245815e75 (2026-09-07). Data as JSON: /api/errors/9e71892875d9ab98. Report an issue: GitHub.

Appendix: source

Thrown at internal/roborock/roborock.go:43

func apiHandle(w http.ResponseWriter, r *http.Request) {
	switch r.Method {
	case "GET":
		if Auth.UserData == nil {
			http.Error(w, "no auth", http.StatusNotFound)
			return
		}

	case "POST":
		if err := r.ParseMultipartForm(1024); err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		username := r.Form.Get("username")
		password := r.Form.Get("password")
		if username == "" || password == "" {
			http.Error(w, "empty username or password", http.StatusBadRequest)
			return
		}

		base, err := roborock.GetBaseURL(username)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		ui, err := roborock.Login(base, username, password)
		if err != nil {
			http.Error(w, err.Error(), http.StatusInternalServerError)
			return
		}

		Auth.BaseURL = base
		Auth.UserData = ui

View on GitHub (pinned to c245815e75)