AlexxIT/go2rtc · error

err.Error()

Error message

err.Error()

What it means

Parsing the multipart request body failed in r.ParseMultipartForm(1024). This happens when the POST body is not valid multipart/form-data matching the Content-Type boundary, or the body exceeds the 1KB maxMemory buffer constraints in a malformed way; the raw parse error is relayed with HTTP 500.

Solutions

1. Send the request as multipart/form-data with fields username and password
2. Set the correct Content-Type header / form enctype
3. Fall back to r.ParseForm for urlencoded requests

Example fix

// before
curl -X POST http://host/api -H 'Content-Type: application/json' -d '{"username":"u","password":"p"}'
// after
curl -X POST http://host/api -F 'username=u' -F 'password=p'

if !strings.HasPrefix(r.Header.Get("Content-Type"), "multipart/form-data") {
	// return 415 asking for multipart/form-data before parsing
}

if err := r.ParseMultipartForm(1024); err != nil {
	// check content type first, then return 400 with a hint to use -F / multipart
}

When it happens

Trigger: POST to the roborock endpoint with a non-multipart Content-Type (e.g. application/x-www-form-urlencoded or JSON), a malformed boundary, or a truncated request body.

Common situations: Client sent JSON instead of multipart form data; curl default content type used; proxy truncated the body; forgot enctype='multipart/form-data' in an HTML form.

Understand the failure class

Background: 'Something went wrong' / 'Request failed (500)' / 'HTTP error! status: 404' — what failed HTTP requests actually mean and how to find the real cause — this error's family across 28 libraries.

Related errors

• milesone: authentication failed:
• failed to create request
• either email/password or refresh token is required
• no auth
• empty username or password

AI-assisted analysis of AlexxIT/go2rtc@c245815e75 (2026-09-07). Data as JSON: /api/errors/866e339bd367d300. Report an issue: GitHub.

Appendix: source

Thrown at internal/roborock/roborock.go:36

	api.HandleFunc("api/roborock", apiHandle)
}

var Auth struct {
	UserData *roborock.UserInfo `json:"user_data"`
	BaseURL  string             `json:"base_url"`
}

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 {

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