Angular2 http Post请求结果为404

Question

我必须在angular2中登录。如果我按下登录，则会出现错误

并且在浏览器上调用链接http://localhost:3000/idx-kk/app_dev.php/de/signon之后我就变成了无法获取/idx-kk/app_dev.php/de/signon 我测试了我的后端和SOAPUI，并且工作正常。我错了什么？

我的login.service.ts是

 login(username, password, tenant): Observable<boolean> {
        let body = JSON.stringify({ user: username, password: password,tenant: tenant  });
        console.log(body);

        return this.http.post("idx-kk/app_dev.php/de/signon", body)
            .map((response: Response) => {
                    console.log(response);
            });
    }

和login.component.ts

    login() {
        this.loading = true;
        this.loginService.login(this.model.username, this.model.password, this.model.tenant)
            .subscribe(result => {
                if (result === true) {
                    // login successful
                    this.router.navigate(['/']);
                } else {
                    // login failed
                    this.error = 'Username or password is incorrect';
                    this.loading = false;
                }
            });
    }