Function canHandleSubdomain

core/router/handler.go:414–450

(ctx *context.Context, subdomain string)

}

func canHandleSubdomain(ctx *context.Context, subdomain string) bool {
	if subdomain == "" {
		return true
	}

	requestHost := ctx.Host()
	if netutil.IsLoopbackSubdomain(requestHost) {
		// this fixes a bug when listening on
		// 127.0.0.1:8080 for example
		// and have a wildcard subdomain and a route registered to root domain.
		return false // it's not a subdomain, it's something like 127.0.0.1 probably
	}
	// it's a dynamic wildcard subdomain, we have just to check if ctx.subdomain is not empty
	if subdomain == SubdomainWildcardIndicator {
		// mydomain.com -> invalid
		// localhost -> invalid
		// sub.mydomain.com -> valid
		// sub.localhost -> valid
		serverHost := ctx.Application().ConfigurationReadOnly().GetVHost()
		if serverHost == requestHost {
			return false // it's not a subdomain, it's a full domain (with .com...)
		}

		dotIdx := strings.IndexByte(requestHost, '.')
		slashIdx := strings.IndexByte(requestHost, '/')
		if dotIdx > 0 && (slashIdx == -1 || slashIdx > dotIdx) {
			// if "." was found anywhere but not at the first path segment (host).
		} else {
			return false
		}
		// continue to that, any subdomain is valid.
	} else if !strings.HasPrefix(requestHost, subdomain) { // subdomain contains the dot, e.g. "admin."
		return false
	}

	return true
}

func (h *routerHandler) HandleRequest(ctx *context.Context) {
	method := ctx.Method()