Function cmdReverseProxy

modules/caddyhttp/reverseproxy/command.go:87–320

(fs caddycmd.Flags)

}

func cmdReverseProxy(fs caddycmd.Flags) (int, error) {
	caddy.TrapSignals()

	from := fs.String("from")
	changeHost := fs.Bool("change-host-header")
	insecure := fs.Bool("insecure")
	disableRedir := fs.Bool("disable-redirects")
	internalCerts := fs.Bool("internal-certs")
	accessLog := fs.Bool("access-log")
	debug := fs.Bool("debug")

	httpPort := strconv.Itoa(caddyhttp.DefaultHTTPPort)
	httpsPort := strconv.Itoa(caddyhttp.DefaultHTTPSPort)

	to, err := fs.GetStringSlice("to")
	if err != nil {
		return caddy.ExitCodeFailedStartup, fmt.Errorf("invalid to flag: %v", err)
	}
	if len(to) == 0 {
		return caddy.ExitCodeFailedStartup, fmt.Errorf("--to is required")
	}

	// set up the downstream address; assume missing information from given parts
	fromAddr, err := httpcaddyfile.ParseAddress(from)
	if err != nil {
		return caddy.ExitCodeFailedStartup, fmt.Errorf("invalid downstream address %s: %v", from, err)
	}
	if fromAddr.Path != "" {
		return caddy.ExitCodeFailedStartup, fmt.Errorf("paths are not allowed: %s", from)
	}
	if fromAddr.Scheme == "" {
		if fromAddr.Port == httpPort || fromAddr.Host == "" {
			fromAddr.Scheme = "http"
		} else {
			fromAddr.Scheme = "https"
		}
	}
	if fromAddr.Port == "" {
		switch fromAddr.Scheme {
		case "http":
			fromAddr.Port = httpPort
		case "https":
			fromAddr.Port = httpsPort
		}
	}

	// set up the upstream address; assume missing information from given parts
	// mixing schemes isn't supported, so use first defined (if available)
	toAddresses := make([]string, len(to))
	var toScheme string
	for i, toLoc := range to {
		addr, err := parseUpstreamDialAddress(toLoc)
		if err != nil {
			return caddy.ExitCodeFailedStartup, fmt.Errorf("invalid upstream address %s: %v", toLoc, err)
		}
		if addr.scheme != "" && toScheme == "" {
			toScheme = addr.scheme
		}