router-for-me/CLIProxyAPI · error

management handler panic: %v

Error message

management handler panic: %v

What it means

Same isolation pattern for the management HTTP route handlers: when a request hits a plugin-registered management route and the plugin's HandleManagement panics, the host recovers, fuses the plugin, and returns this error. The management endpoint then reports failure instead of taking down the server.

Source

Thrown at internal/pluginhost/management.go:337

	if statusCode == 0 {
		statusCode = http.StatusOK
	}
	w.WriteHeader(statusCode)
	if _, errWrite := w.Write(resp.Body); errWrite != nil {
		log.Warnf("pluginhost: failed to write plugin resource response: %v", errWrite)
	}
	return true
}

func (h *Host) callManagementHandler(ctx context.Context, record managementRouteRecord, req pluginapi.ManagementRequest) (resp pluginapi.ManagementResponse, err error) {
	if h == nil || record.route.Handler == nil || h.isPluginFused(record.pluginID) || !h.pluginIdentityCurrent(record.pluginID, record.path, record.version) {
		return pluginapi.ManagementResponse{}, nil
	}
	defer func() {
		if recovered := recover(); recovered != nil {
			h.fusePlugin(record.pluginID, "ManagementHandler.HandleManagement", recovered)
			resp = pluginapi.ManagementResponse{}
			err = fmt.Errorf("management handler panic: %v", recovered)
		}
	}()
	return record.route.Handler.HandleManagement(ctx, req)
}

func escapeManagementResponseBody(resp pluginapi.ManagementResponse) []byte {
	body, okEscaped := htmlsanitize.JSONBodyIfLikely(resp.Body, resp.Headers.Get("Content-Type"))
	if !okEscaped {
		return resp.Body
	}
	return body
}

func (h *Host) callResourceHandler(ctx context.Context, record resourceRouteRecord, req pluginapi.ManagementRequest) (resp pluginapi.ManagementResponse, err error) {
	if h == nil || record.route.Handler == nil || h.isPluginFused(record.pluginID) || !h.pluginIdentityCurrent(record.pluginID, record.path, record.version) {
		return pluginapi.ManagementResponse{}, nil
	}
	defer func() {

View on GitHub (pinned to 78f0c4079e)

Solutions

1. Reproduce the failing management request and fix the panic cause in the plugin's HandleManagement
2. Guard the handler: validate req fields (path params, body) before use; avoid unchecked type assertions
3. Disable the offending route/plugin until fixed; restart the server afterwards since the plugin is fused

Example fix

// before (plugin handler)
func (h route) HandleManagement(ctx context.Context, req pluginapi.ManagementRequest) (pluginapi.ManagementResponse, error) {
    id := strings.Split(req.Path, "/")[2] // panics on short paths
    ...
}

// after
func (h route) HandleManagement(ctx context.Context, req pluginapi.ManagementRequest) (pluginapi.ManagementResponse, error) {
    parts := strings.Split(strings.Trim(req.Path, "/"), "/")
    if len(parts) < 2 {
        return pluginapi.ManagementResponse{Status: http.StatusBadRequest, Body: []byte("invalid path")}, nil
    }
    id := parts[1]
    ...
}

resp, err := h.callManagementHandler(ctx, record, req)
if err != nil {
    if strings.Contains(err.Error(), "management handler panic") {
        c.JSON(http.StatusInternalServerError, gin.H{"error": "plugin management handler failed"})
        return
    }
}

When it happens

Trigger: A management route handler panicking on a specific request: nil deref on a header, type assertion failure on the request body, slice bounds on a path parameter.

Common situations: Plugin handlers only tested with happy-path requests; unexpected request shapes (missing query params, empty bodies) from management UI or scripts; plugin state mutated concurrently.

Related errors

• management registrar panic: %v
• resource handler panic: %v
• plugin executor %s stream panic: %v
• plugin executor %s refresh panic: %v
• plugin executor %s count tokens panic: %v

AI-assisted analysis of router-for-me/CLIProxyAPI@78f0c4079e (2026-08-15). Data as JSON: /api/errors/04a2a23c0c058cf4. Report an issue: GitHub.